├── C语言笔记.md ├── README.md ├── code ├── 1 │ ├── 1.4 │ ├── 1.4.c │ └── gccby │ │ ├── introduce │ │ ├── introduce.c │ │ ├── introduce.i │ │ ├── introduce.o │ │ ├── introduce.s │ │ └── introduce1 ├── 2 │ ├── 2.2.1 │ ├── 2.2.1.c │ ├── 2.2.2 │ ├── 2.2.2.c │ ├── 2.2.3 │ ├── 2.2.3.c │ ├── 2.2.4-1 │ ├── 2.2.4-1.c │ ├── 2.3 │ ├── 2.3.c │ ├── 2.4.1 │ ├── 2.4.1.c │ ├── 2.4.2 │ ├── 2.4.2.c │ ├── 2.4.4 │ ├── 2.4.4.c │ ├── 2.5 │ ├── 2.5.c │ ├── 2.6.4 │ ├── 2.6.4.c │ ├── 2.7.5 │ ├── 2.7.5.c │ ├── 2.9.2 │ ├── 2.9.2.c │ ├── 2.9.3 │ └── 2.9.3.c ├── 3 │ ├── 3.7.1 │ ├── 3.7.1.c │ ├── 3.7.2 │ └── 3.7.2.c ├── 4 │ ├── 4.2.5 │ ├── 4.2.5.c │ ├── 4.3.1 │ ├── 4.3.1.c │ ├── 4.4.2 │ ├── 4.4.2.c │ ├── 4.4.3 │ └── 4.4.3.c ├── 5 │ ├── 5.2.1 │ ├── 5.2.1.c │ ├── 5.2.3 │ ├── 5.2.3.c │ ├── 5.2.4-1 │ ├── 5.2.4-1.c │ ├── 5.2.4-2 │ ├── 5.2.4-2.c │ ├── 5.2.4-3 │ ├── 5.2.4-3.c │ ├── 5.3.3 │ ├── 5.3.3.c │ ├── 5.3.4 │ ├── 5.3.4.c │ ├── 5.4 │ ├── 5.4.c │ ├── 5.5.1 │ ├── 5.5.1.c │ ├── 5.5.2.c │ ├── 5.5.3-5 │ └── 5.5.3-5.c ├── 6 │ ├── 6.1.2 │ └── 6.1.2.c ├── 7 │ ├── 7.2.1 │ ├── 7.2.1.c │ ├── 7.2.3 │ ├── 7.2.3.c │ ├── 7.3.2 │ ├── 7.3.2.c │ ├── 7.3.3-2 │ ├── 7.3.3-2.c │ ├── 7.5.1 │ ├── 7.5.1.c │ ├── 7.5.2 │ ├── 7.5.2.c │ ├── 7.5.3 │ ├── 7.5.3.c │ ├── 7.5.5-1-a │ ├── 7.5.5-1-a.c │ ├── 7.6.1 │ ├── 7.6.1.c │ ├── 7.6.5-2 │ ├── 7.6.5-2.c │ ├── 7.6.5-3 │ ├── 7.6.5-3.c │ ├── 7.6.5.1-2 │ ├── 7.6.5.1-2.c │ ├── 7.6.6-9 │ ├── 7.6.6-9.c │ ├── 7.7.3 │ └── 7.7.3.c ├── 8 │ ├── 8.1.2 │ ├── 8.1.2.c │ ├── 8.2.2 │ ├── 8.2.2.c │ ├── 8.2.4-1 │ └── 8.2.4-1.c └── 9 │ ├── 10.5 │ ├── 10.5.c │ ├── 9.3 │ └── 9.3.c ├── docs ├── C基础讲义.doc └── C语言标准库函数大全.chm └── img ├── 2-1Q11512525J14.gif ├── clip_image002-1600476727438.jpg ├── clip_image002-1600476849331.jpg ├── clip_image002-1600476855287.jpg ├── clip_image002-1600476859772.jpg ├── clip_image002-1600480373517.png ├── clip_image002-1600484267948.jpg ├── clip_image002-1600484293600.jpg ├── clip_image002-1600484648234.jpg ├── clip_image002-1600495561286.jpg ├── clip_image002-1600500777852.png ├── clip_image002-1600500801245.jpg ├── clip_image002-1600500855480.jpg ├── clip_image002-1600500866476.jpg ├── clip_image002-1600501357582.jpg ├── clip_image002-1600501365915.jpg ├── clip_image002-1600502184471.jpg ├── clip_image002-1600502207939.jpg ├── clip_image002-1600503616364.jpg ├── clip_image002-1600565386733.jpg ├── clip_image002-1600565899951.png ├── clip_image002-1600565955370.png ├── clip_image002-1600565985028.png ├── clip_image002-1600566360348.png ├── clip_image002-1600566398556.png ├── clip_image002-1600570691948.png ├── clip_image002-1600585634394.png ├── clip_image002-1600753669406.jpg ├── clip_image002-1600778555216.jpg ├── clip_image002-1600782355725.png ├── clip_image002-1600782473718.png ├── clip_image002-1600937546831.png ├── clip_image002-1601020859989.jpg ├── clip_image002-1601021875042.jpg ├── clip_image002-1601038402799.jpg ├── clip_image002-1601038507385.jpg ├── clip_image002-1601113908804.jpg ├── clip_image002-1601123785585.png ├── clip_image002-1601131241385.jpg ├── clip_image002-1601131628499.jpg ├── clip_image002-1601186383431.jpg ├── clip_image002.jpg ├── clip_image002.png ├── image-20200919090134713.png ├── image-20200919092034856.png ├── image-20200919094712699.png ├── image-20200919101105887.png ├── image-20200919101944251.png ├── image-20200919102259922.png ├── image-20200919102850515.png ├── image-20200919102938934.png ├── image-20200919133924510.png ├── image-20200920092724191.png ├── image-20200920211035690.png ├── image-20200925161021903.png └── readme.txt /README.md: -------------------------------------------------------------------------------- 1 | # C-Learning 2 | C语言基础学习笔记！ 3 | 4 | ## 已完成章节 5 | - 1.C语言概述 6 | - 2.数据类型 7 | - 3.运算符与表达式 8 | - 4.程序流程结构 9 | - 5.数组和字符串 10 | - 6.函数 11 | - 7.指针 12 | - 8.内存管理 13 | - 9.复合类型(自定义类型) 14 | - 10.文件操作 15 | 16 | **本笔记代码(code目录下)在Linux平台下测试运行的** 17 | 18 | > 注：本学习笔记以及案例来源于黑马程序员C语言入门教程，源文件已放置`docs/`目录下 19 | -------------------------------------------------------------------------------- /code/1/1.4: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/1/1.4 -------------------------------------------------------------------------------- /code/1/1.4.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | 4 | int main(){ 5 | // system("calc"); // windows平台 6 | system("ls"); // //Linux平台, 需要头文件#include 7 | 8 | return 0; 9 | } 10 | -------------------------------------------------------------------------------- /code/1/gccby/introduce: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/1/gccby/introduce -------------------------------------------------------------------------------- /code/1/gccby/introduce.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main(){ 4 | printf("Hello Tao!"); 5 | 6 | return 0; 7 | } 8 | -------------------------------------------------------------------------------- /code/1/gccby/introduce.i: -------------------------------------------------------------------------------- 1 | # 1 "introduce.c" 2 | # 1 "" 3 | # 1 "" 4 | # 31 "" 5 | # 1 "/usr/include/stdc-predef.h" 1 3 4 6 | # 32 "" 2 7 | # 1 "introduce.c" 8 | # 1 "/usr/include/stdio.h" 1 3 4 9 | # 27 "/usr/include/stdio.h" 3 4 10 | # 1 "/usr/include/x86_64-linux-gnu/bits/libc-header-start.h" 1 3 4 11 | # 33 "/usr/include/x86_64-linux-gnu/bits/libc-header-start.h" 3 4 12 | # 1 "/usr/include/features.h" 1 3 4 13 | # 446 "/usr/include/features.h" 3 4 14 | # 1 "/usr/include/x86_64-linux-gnu/sys/cdefs.h" 1 3 4 15 | # 452 "/usr/include/x86_64-linux-gnu/sys/cdefs.h" 3 4 16 | # 1 "/usr/include/x86_64-linux-gnu/bits/wordsize.h" 1 3 4 17 | # 453 "/usr/include/x86_64-linux-gnu/sys/cdefs.h" 2 3 4 18 | # 1 "/usr/include/x86_64-linux-gnu/bits/long-double.h" 1 3 4 19 | # 454 "/usr/include/x86_64-linux-gnu/sys/cdefs.h" 2 3 4 20 | # 447 "/usr/include/features.h" 2 3 4 21 | # 470 "/usr/include/features.h" 3 4 22 | # 1 "/usr/include/x86_64-linux-gnu/gnu/stubs.h" 1 3 4 23 | # 10 "/usr/include/x86_64-linux-gnu/gnu/stubs.h" 3 4 24 | # 1 "/usr/include/x86_64-linux-gnu/gnu/stubs-64.h" 1 3 4 25 | # 11 "/usr/include/x86_64-linux-gnu/gnu/stubs.h" 2 3 4 26 | # 471 "/usr/include/features.h" 2 3 4 27 | # 34 "/usr/include/x86_64-linux-gnu/bits/libc-header-start.h" 2 3 4 28 | # 28 "/usr/include/stdio.h" 2 3 4 29 | 30 | 31 | 32 | 33 | 34 | # 1 "/usr/lib/gcc/x86_64-linux-gnu/8/include/stddef.h" 1 3 4 35 | # 216 "/usr/lib/gcc/x86_64-linux-gnu/8/include/stddef.h" 3 4 36 | 37 | # 216 "/usr/lib/gcc/x86_64-linux-gnu/8/include/stddef.h" 3 4 38 | typedef long unsigned int size_t; 39 | # 34 "/usr/include/stdio.h" 2 3 4 40 | 41 | 42 | # 1 "/usr/lib/gcc/x86_64-linux-gnu/8/include/stdarg.h" 1 3 4 43 | # 40 "/usr/lib/gcc/x86_64-linux-gnu/8/include/stdarg.h" 3 4 44 | typedef __builtin_va_list __gnuc_va_list; 45 | # 37 "/usr/include/stdio.h" 2 3 4 46 | 47 | # 1 "/usr/include/x86_64-linux-gnu/bits/types.h" 1 3 4 48 | # 27 "/usr/include/x86_64-linux-gnu/bits/types.h" 3 4 49 | # 1 "/usr/include/x86_64-linux-gnu/bits/wordsize.h" 1 3 4 50 | # 28 "/usr/include/x86_64-linux-gnu/bits/types.h" 2 3 4 51 | # 1 "/usr/include/x86_64-linux-gnu/bits/timesize.h" 1 3 4 52 | # 29 "/usr/include/x86_64-linux-gnu/bits/types.h" 2 3 4 53 | 54 | 55 | typedef unsigned char __u_char; 56 | typedef unsigned short int __u_short; 57 | typedef unsigned int __u_int; 58 | typedef unsigned long int __u_long; 59 | 60 | 61 | typedef signed char __int8_t; 62 | typedef unsigned char __uint8_t; 63 | typedef signed short int __int16_t; 64 | typedef unsigned short int __uint16_t; 65 | typedef signed int __int32_t; 66 | typedef unsigned int __uint32_t; 67 | 68 | typedef signed long int __int64_t; 69 | typedef unsigned long int __uint64_t; 70 | 71 | 72 | 73 | 74 | 75 | 76 | typedef __int8_t __int_least8_t; 77 | typedef __uint8_t __uint_least8_t; 78 | typedef __int16_t __int_least16_t; 79 | typedef __uint16_t __uint_least16_t; 80 | typedef __int32_t __int_least32_t; 81 | typedef __uint32_t __uint_least32_t; 82 | typedef __int64_t __int_least64_t; 83 | typedef __uint64_t __uint_least64_t; 84 | 85 | 86 | 87 | typedef long int __quad_t; 88 | typedef unsigned long int __u_quad_t; 89 | 90 | 91 | 92 | 93 | 94 | 95 | 96 | typedef long int __intmax_t; 97 | typedef unsigned long int __uintmax_t; 98 | # 141 "/usr/include/x86_64-linux-gnu/bits/types.h" 3 4 99 | # 1 "/usr/include/x86_64-linux-gnu/bits/typesizes.h" 1 3 4 100 | # 142 "/usr/include/x86_64-linux-gnu/bits/types.h" 2 3 4 101 | # 1 "/usr/include/x86_64-linux-gnu/bits/time64.h" 1 3 4 102 | # 143 "/usr/include/x86_64-linux-gnu/bits/types.h" 2 3 4 103 | 104 | 105 | typedef unsigned long int __dev_t; 106 | typedef unsigned int __uid_t; 107 | typedef unsigned int __gid_t; 108 | typedef unsigned long int __ino_t; 109 | typedef unsigned long int __ino64_t; 110 | typedef unsigned int __mode_t; 111 | typedef unsigned long int __nlink_t; 112 | typedef long int __off_t; 113 | typedef long int __off64_t; 114 | typedef int __pid_t; 115 | typedef struct { int __val[2]; } __fsid_t; 116 | typedef long int __clock_t; 117 | typedef unsigned long int __rlim_t; 118 | typedef unsigned long int __rlim64_t; 119 | typedef unsigned int __id_t; 120 | typedef long int __time_t; 121 | typedef unsigned int __useconds_t; 122 | typedef long int __suseconds_t; 123 | 124 | typedef int __daddr_t; 125 | typedef int __key_t; 126 | 127 | 128 | typedef int __clockid_t; 129 | 130 | 131 | typedef void * __timer_t; 132 | 133 | 134 | typedef long int __blksize_t; 135 | 136 | 137 | 138 | 139 | typedef long int __blkcnt_t; 140 | typedef long int __blkcnt64_t; 141 | 142 | 143 | typedef unsigned long int __fsblkcnt_t; 144 | typedef unsigned long int __fsblkcnt64_t; 145 | 146 | 147 | typedef unsigned long int __fsfilcnt_t; 148 | typedef unsigned long int __fsfilcnt64_t; 149 | 150 | 151 | typedef long int __fsword_t; 152 | 153 | typedef long int __ssize_t; 154 | 155 | 156 | typedef long int __syscall_slong_t; 157 | 158 | typedef unsigned long int __syscall_ulong_t; 159 | 160 | 161 | 162 | typedef __off64_t __loff_t; 163 | typedef char *__caddr_t; 164 | 165 | 166 | typedef long int __intptr_t; 167 | 168 | 169 | typedef unsigned int __socklen_t; 170 | 171 | 172 | 173 | 174 | typedef int __sig_atomic_t; 175 | # 39 "/usr/include/stdio.h" 2 3 4 176 | # 1 "/usr/include/x86_64-linux-gnu/bits/types/__fpos_t.h" 1 3 4 177 | 178 | 179 | 180 | 181 | # 1 "/usr/include/x86_64-linux-gnu/bits/types/__mbstate_t.h" 1 3 4 182 | # 13 "/usr/include/x86_64-linux-gnu/bits/types/__mbstate_t.h" 3 4 183 | typedef struct 184 | { 185 | int __count; 186 | union 187 | { 188 | unsigned int __wch; 189 | char __wchb[4]; 190 | } __value; 191 | } __mbstate_t; 192 | # 6 "/usr/include/x86_64-linux-gnu/bits/types/__fpos_t.h" 2 3 4 193 | 194 | 195 | 196 | 197 | typedef struct _G_fpos_t 198 | { 199 | __off_t __pos; 200 | __mbstate_t __state; 201 | } __fpos_t; 202 | # 40 "/usr/include/stdio.h" 2 3 4 203 | # 1 "/usr/include/x86_64-linux-gnu/bits/types/__fpos64_t.h" 1 3 4 204 | # 10 "/usr/include/x86_64-linux-gnu/bits/types/__fpos64_t.h" 3 4 205 | typedef struct _G_fpos64_t 206 | { 207 | __off64_t __pos; 208 | __mbstate_t __state; 209 | } __fpos64_t; 210 | # 41 "/usr/include/stdio.h" 2 3 4 211 | # 1 "/usr/include/x86_64-linux-gnu/bits/types/__FILE.h" 1 3 4 212 | 213 | 214 | 215 | struct _IO_FILE; 216 | typedef struct _IO_FILE __FILE; 217 | # 42 "/usr/include/stdio.h" 2 3 4 218 | # 1 "/usr/include/x86_64-linux-gnu/bits/types/FILE.h" 1 3 4 219 | 220 | 221 | 222 | struct _IO_FILE; 223 | 224 | 225 | typedef struct _IO_FILE FILE; 226 | # 43 "/usr/include/stdio.h" 2 3 4 227 | # 1 "/usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h" 1 3 4 228 | # 35 "/usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h" 3 4 229 | struct _IO_FILE; 230 | struct _IO_marker; 231 | struct _IO_codecvt; 232 | struct _IO_wide_data; 233 | 234 | 235 | 236 | 237 | typedef void _IO_lock_t; 238 | 239 | 240 | 241 | 242 | 243 | struct _IO_FILE 244 | { 245 | int _flags; 246 | 247 | 248 | char *_IO_read_ptr; 249 | char *_IO_read_end; 250 | char *_IO_read_base; 251 | char *_IO_write_base; 252 | char *_IO_write_ptr; 253 | char *_IO_write_end; 254 | char *_IO_buf_base; 255 | char *_IO_buf_end; 256 | 257 | 258 | char *_IO_save_base; 259 | char *_IO_backup_base; 260 | char *_IO_save_end; 261 | 262 | struct _IO_marker *_markers; 263 | 264 | struct _IO_FILE *_chain; 265 | 266 | int _fileno; 267 | int _flags2; 268 | __off_t _old_offset; 269 | 270 | 271 | unsigned short _cur_column; 272 | signed char _vtable_offset; 273 | char _shortbuf[1]; 274 | 275 | _IO_lock_t *_lock; 276 | 277 | 278 | 279 | 280 | 281 | 282 | 283 | __off64_t _offset; 284 | 285 | struct _IO_codecvt *_codecvt; 286 | struct _IO_wide_data *_wide_data; 287 | struct _IO_FILE *_freeres_list; 288 | void *_freeres_buf; 289 | size_t __pad5; 290 | int _mode; 291 | 292 | char _unused2[15 * sizeof (int) - 4 * sizeof (void *) - sizeof (size_t)]; 293 | }; 294 | # 44 "/usr/include/stdio.h" 2 3 4 295 | # 52 "/usr/include/stdio.h" 3 4 296 | typedef __gnuc_va_list va_list; 297 | # 63 "/usr/include/stdio.h" 3 4 298 | typedef __off_t off_t; 299 | # 77 "/usr/include/stdio.h" 3 4 300 | typedef __ssize_t ssize_t; 301 | 302 | 303 | 304 | 305 | 306 | 307 | typedef __fpos_t fpos_t; 308 | # 133 "/usr/include/stdio.h" 3 4 309 | # 1 "/usr/include/x86_64-linux-gnu/bits/stdio_lim.h" 1 3 4 310 | # 134 "/usr/include/stdio.h" 2 3 4 311 | 312 | 313 | 314 | extern FILE *stdin; 315 | extern FILE *stdout; 316 | extern FILE *stderr; 317 | 318 | 319 | 320 | 321 | 322 | 323 | extern int remove (const char *__filename) __attribute__ ((__nothrow__ , __leaf__)); 324 | 325 | extern int rename (const char *__old, const char *__new) __attribute__ ((__nothrow__ , __leaf__)); 326 | 327 | 328 | 329 | extern int renameat (int __oldfd, const char *__old, int __newfd, 330 | const char *__new) __attribute__ ((__nothrow__ , __leaf__)); 331 | # 173 "/usr/include/stdio.h" 3 4 332 | extern FILE *tmpfile (void) ; 333 | # 187 "/usr/include/stdio.h" 3 4 334 | extern char *tmpnam (char *__s) __attribute__ ((__nothrow__ , __leaf__)) ; 335 | 336 | 337 | 338 | 339 | extern char *tmpnam_r (char *__s) __attribute__ ((__nothrow__ , __leaf__)) ; 340 | # 204 "/usr/include/stdio.h" 3 4 341 | extern char *tempnam (const char *__dir, const char *__pfx) 342 | __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__malloc__)) ; 343 | 344 | 345 | 346 | 347 | 348 | 349 | 350 | extern int fclose (FILE *__stream); 351 | 352 | 353 | 354 | 355 | extern int fflush (FILE *__stream); 356 | # 227 "/usr/include/stdio.h" 3 4 357 | extern int fflush_unlocked (FILE *__stream); 358 | # 246 "/usr/include/stdio.h" 3 4 359 | extern FILE *fopen (const char *__restrict __filename, 360 | const char *__restrict __modes) ; 361 | 362 | 363 | 364 | 365 | extern FILE *freopen (const char *__restrict __filename, 366 | const char *__restrict __modes, 367 | FILE *__restrict __stream) ; 368 | # 279 "/usr/include/stdio.h" 3 4 369 | extern FILE *fdopen (int __fd, const char *__modes) __attribute__ ((__nothrow__ , __leaf__)) ; 370 | # 292 "/usr/include/stdio.h" 3 4 371 | extern FILE *fmemopen (void *__s, size_t __len, const char *__modes) 372 | __attribute__ ((__nothrow__ , __leaf__)) ; 373 | 374 | 375 | 376 | 377 | extern FILE *open_memstream (char **__bufloc, size_t *__sizeloc) __attribute__ ((__nothrow__ , __leaf__)) ; 378 | 379 | 380 | 381 | 382 | 383 | extern void setbuf (FILE *__restrict __stream, char *__restrict __buf) __attribute__ ((__nothrow__ , __leaf__)); 384 | 385 | 386 | 387 | extern int setvbuf (FILE *__restrict __stream, char *__restrict __buf, 388 | int __modes, size_t __n) __attribute__ ((__nothrow__ , __leaf__)); 389 | 390 | 391 | 392 | 393 | extern void setbuffer (FILE *__restrict __stream, char *__restrict __buf, 394 | size_t __size) __attribute__ ((__nothrow__ , __leaf__)); 395 | 396 | 397 | extern void setlinebuf (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)); 398 | 399 | 400 | 401 | 402 | 403 | 404 | 405 | extern int fprintf (FILE *__restrict __stream, 406 | const char *__restrict __format, ...); 407 | 408 | 409 | 410 | 411 | extern int printf (const char *__restrict __format, ...); 412 | 413 | extern int sprintf (char *__restrict __s, 414 | const char *__restrict __format, ...) __attribute__ ((__nothrow__)); 415 | 416 | 417 | 418 | 419 | 420 | extern int vfprintf (FILE *__restrict __s, const char *__restrict __format, 421 | __gnuc_va_list __arg); 422 | 423 | 424 | 425 | 426 | extern int vprintf (const char *__restrict __format, __gnuc_va_list __arg); 427 | 428 | extern int vsprintf (char *__restrict __s, const char *__restrict __format, 429 | __gnuc_va_list __arg) __attribute__ ((__nothrow__)); 430 | 431 | 432 | 433 | extern int snprintf (char *__restrict __s, size_t __maxlen, 434 | const char *__restrict __format, ...) 435 | __attribute__ ((__nothrow__)) __attribute__ ((__format__ (__printf__, 3, 4))); 436 | 437 | extern int vsnprintf (char *__restrict __s, size_t __maxlen, 438 | const char *__restrict __format, __gnuc_va_list __arg) 439 | __attribute__ ((__nothrow__)) __attribute__ ((__format__ (__printf__, 3, 0))); 440 | # 379 "/usr/include/stdio.h" 3 4 441 | extern int vdprintf (int __fd, const char *__restrict __fmt, 442 | __gnuc_va_list __arg) 443 | __attribute__ ((__format__ (__printf__, 2, 0))); 444 | extern int dprintf (int __fd, const char *__restrict __fmt, ...) 445 | __attribute__ ((__format__ (__printf__, 2, 3))); 446 | 447 | 448 | 449 | 450 | 451 | 452 | 453 | extern int fscanf (FILE *__restrict __stream, 454 | const char *__restrict __format, ...) ; 455 | 456 | 457 | 458 | 459 | extern int scanf (const char *__restrict __format, ...) ; 460 | 461 | extern int sscanf (const char *__restrict __s, 462 | const char *__restrict __format, ...) __attribute__ ((__nothrow__ , __leaf__)); 463 | 464 | 465 | 466 | 467 | 468 | 469 | extern int fscanf (FILE *__restrict __stream, const char *__restrict __format, ...) __asm__ ("" "__isoc99_fscanf") 470 | 471 | ; 472 | extern int scanf (const char *__restrict __format, ...) __asm__ ("" "__isoc99_scanf") 473 | ; 474 | extern int sscanf (const char *__restrict __s, const char *__restrict __format, ...) __asm__ ("" "__isoc99_sscanf") __attribute__ ((__nothrow__ , __leaf__)) 475 | 476 | ; 477 | # 432 "/usr/include/stdio.h" 3 4 478 | extern int vfscanf (FILE *__restrict __s, const char *__restrict __format, 479 | __gnuc_va_list __arg) 480 | __attribute__ ((__format__ (__scanf__, 2, 0))) ; 481 | 482 | 483 | 484 | 485 | 486 | extern int vscanf (const char *__restrict __format, __gnuc_va_list __arg) 487 | __attribute__ ((__format__ (__scanf__, 1, 0))) ; 488 | 489 | 490 | extern int vsscanf (const char *__restrict __s, 491 | const char *__restrict __format, __gnuc_va_list __arg) 492 | __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__format__ (__scanf__, 2, 0))); 493 | 494 | 495 | 496 | 497 | extern int vfscanf (FILE *__restrict __s, const char *__restrict __format, __gnuc_va_list __arg) __asm__ ("" "__isoc99_vfscanf") 498 | 499 | 500 | 501 | __attribute__ ((__format__ (__scanf__, 2, 0))) ; 502 | extern int vscanf (const char *__restrict __format, __gnuc_va_list __arg) __asm__ ("" "__isoc99_vscanf") 503 | 504 | __attribute__ ((__format__ (__scanf__, 1, 0))) ; 505 | extern int vsscanf (const char *__restrict __s, const char *__restrict __format, __gnuc_va_list __arg) __asm__ ("" "__isoc99_vsscanf") __attribute__ ((__nothrow__ , __leaf__)) 506 | 507 | 508 | 509 | __attribute__ ((__format__ (__scanf__, 2, 0))); 510 | # 485 "/usr/include/stdio.h" 3 4 511 | extern int fgetc (FILE *__stream); 512 | extern int getc (FILE *__stream); 513 | 514 | 515 | 516 | 517 | 518 | extern int getchar (void); 519 | 520 | 521 | 522 | 523 | 524 | 525 | extern int getc_unlocked (FILE *__stream); 526 | extern int getchar_unlocked (void); 527 | # 510 "/usr/include/stdio.h" 3 4 528 | extern int fgetc_unlocked (FILE *__stream); 529 | # 521 "/usr/include/stdio.h" 3 4 530 | extern int fputc (int __c, FILE *__stream); 531 | extern int putc (int __c, FILE *__stream); 532 | 533 | 534 | 535 | 536 | 537 | extern int putchar (int __c); 538 | # 537 "/usr/include/stdio.h" 3 4 539 | extern int fputc_unlocked (int __c, FILE *__stream); 540 | 541 | 542 | 543 | 544 | 545 | 546 | 547 | extern int putc_unlocked (int __c, FILE *__stream); 548 | extern int putchar_unlocked (int __c); 549 | 550 | 551 | 552 | 553 | 554 | 555 | extern int getw (FILE *__stream); 556 | 557 | 558 | extern int putw (int __w, FILE *__stream); 559 | 560 | 561 | 562 | 563 | 564 | 565 | 566 | extern char *fgets (char *__restrict __s, int __n, FILE *__restrict __stream) 567 | ; 568 | # 603 "/usr/include/stdio.h" 3 4 569 | extern __ssize_t __getdelim (char **__restrict __lineptr, 570 | size_t *__restrict __n, int __delimiter, 571 | FILE *__restrict __stream) ; 572 | extern __ssize_t getdelim (char **__restrict __lineptr, 573 | size_t *__restrict __n, int __delimiter, 574 | FILE *__restrict __stream) ; 575 | 576 | 577 | 578 | 579 | 580 | 581 | 582 | extern __ssize_t getline (char **__restrict __lineptr, 583 | size_t *__restrict __n, 584 | FILE *__restrict __stream) ; 585 | 586 | 587 | 588 | 589 | 590 | 591 | 592 | extern int fputs (const char *__restrict __s, FILE *__restrict __stream); 593 | 594 | 595 | 596 | 597 | 598 | extern int puts (const char *__s); 599 | 600 | 601 | 602 | 603 | 604 | 605 | extern int ungetc (int __c, FILE *__stream); 606 | 607 | 608 | 609 | 610 | 611 | 612 | extern size_t fread (void *__restrict __ptr, size_t __size, 613 | size_t __n, FILE *__restrict __stream) ; 614 | 615 | 616 | 617 | 618 | extern size_t fwrite (const void *__restrict __ptr, size_t __size, 619 | size_t __n, FILE *__restrict __s); 620 | # 673 "/usr/include/stdio.h" 3 4 621 | extern size_t fread_unlocked (void *__restrict __ptr, size_t __size, 622 | size_t __n, FILE *__restrict __stream) ; 623 | extern size_t fwrite_unlocked (const void *__restrict __ptr, size_t __size, 624 | size_t __n, FILE *__restrict __stream); 625 | 626 | 627 | 628 | 629 | 630 | 631 | 632 | extern int fseek (FILE *__stream, long int __off, int __whence); 633 | 634 | 635 | 636 | 637 | extern long int ftell (FILE *__stream) ; 638 | 639 | 640 | 641 | 642 | extern void rewind (FILE *__stream); 643 | # 707 "/usr/include/stdio.h" 3 4 644 | extern int fseeko (FILE *__stream, __off_t __off, int __whence); 645 | 646 | 647 | 648 | 649 | extern __off_t ftello (FILE *__stream) ; 650 | # 731 "/usr/include/stdio.h" 3 4 651 | extern int fgetpos (FILE *__restrict __stream, fpos_t *__restrict __pos); 652 | 653 | 654 | 655 | 656 | extern int fsetpos (FILE *__stream, const fpos_t *__pos); 657 | # 757 "/usr/include/stdio.h" 3 4 658 | extern void clearerr (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)); 659 | 660 | extern int feof (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ; 661 | 662 | extern int ferror (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ; 663 | 664 | 665 | 666 | extern void clearerr_unlocked (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)); 667 | extern int feof_unlocked (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ; 668 | extern int ferror_unlocked (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ; 669 | 670 | 671 | 672 | 673 | 674 | 675 | 676 | extern void perror (const char *__s); 677 | 678 | 679 | 680 | 681 | 682 | # 1 "/usr/include/x86_64-linux-gnu/bits/sys_errlist.h" 1 3 4 683 | # 26 "/usr/include/x86_64-linux-gnu/bits/sys_errlist.h" 3 4 684 | extern int sys_nerr; 685 | extern const char *const sys_errlist[]; 686 | # 782 "/usr/include/stdio.h" 2 3 4 687 | 688 | 689 | 690 | 691 | extern int fileno (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ; 692 | 693 | 694 | 695 | 696 | extern int fileno_unlocked (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ; 697 | # 800 "/usr/include/stdio.h" 3 4 698 | extern FILE *popen (const char *__command, const char *__modes) ; 699 | 700 | 701 | 702 | 703 | 704 | extern int pclose (FILE *__stream); 705 | 706 | 707 | 708 | 709 | 710 | extern char *ctermid (char *__s) __attribute__ ((__nothrow__ , __leaf__)); 711 | # 840 "/usr/include/stdio.h" 3 4 712 | extern void flockfile (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)); 713 | 714 | 715 | 716 | extern int ftrylockfile (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ; 717 | 718 | 719 | extern void funlockfile (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)); 720 | # 858 "/usr/include/stdio.h" 3 4 721 | extern int __uflow (FILE *); 722 | extern int __overflow (FILE *, int); 723 | # 873 "/usr/include/stdio.h" 3 4 724 | 725 | # 2 "introduce.c" 2 726 | 727 | 728 | # 3 "introduce.c" 729 | int main(){ 730 | printf("Hello Tao!"); 731 | 732 | return 0; 733 | } 734 | -------------------------------------------------------------------------------- /code/1/gccby/introduce.o: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/1/gccby/introduce.o -------------------------------------------------------------------------------- /code/1/gccby/introduce.s: -------------------------------------------------------------------------------- 1 | .file "introduce.c" 2 | .text 3 | .section .rodata 4 | .LC0: 5 | .string "Hello Tao!" 6 | .text 7 | .globl main 8 | .type main, @function 9 | main: 10 | .LFB0: 11 | .cfi_startproc 12 | pushq %rbp 13 | .cfi_def_cfa_offset 16 14 | .cfi_offset 6, -16 15 | movq %rsp, %rbp 16 | .cfi_def_cfa_register 6 17 | leaq .LC0(%rip), %rdi 18 | movl $0, %eax 19 | call printf@PLT 20 | movl $0, %eax 21 | popq %rbp 22 | .cfi_def_cfa 7, 8 23 | ret 24 | .cfi_endproc 25 | .LFE0: 26 | .size main, .-main 27 | .ident "GCC: (Ubuntu 8.4.0-1ubuntu1~18.04) 8.4.0" 28 | .section .note.GNU-stack,"",@progbits 29 | -------------------------------------------------------------------------------- /code/1/gccby/introduce1: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/1/gccby/introduce1 -------------------------------------------------------------------------------- /code/2/2.2.1: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/2/2.2.1 -------------------------------------------------------------------------------- /code/2/2.2.1.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | int a = 123; //定义变量a，以10进制方式赋值为123 6 | int b = 0567; //定义变量b，以8进制方式赋值为0567 7 | int c = 0xabc; //定义变量c，以16进制方式赋值为0xabc 8 | 9 | printf("a = %d\n", a); 10 | printf("8进制：b = %o\n", b); 11 | printf("10进制：b = %d\n", b); 12 | printf("16进制：c = %x\n", c); 13 | printf("16进制：c = %X\n", c); 14 | printf("10进制：c = %d\n", c); 15 | 16 | unsigned int d = 0xffffffff; //定义无符号int变量d，以16进制方式赋值 17 | printf("有符号方式打印：d = %d\n", d); 18 | printf("无符号方式打印：d = %u\n", d); 19 | return 0; 20 | } 21 | -------------------------------------------------------------------------------- /code/2/2.2.2: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/2/2.2.2 -------------------------------------------------------------------------------- /code/2/2.2.2.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | int a; 6 | printf("请输入a的值："); 7 | 8 | //不要加"\n" 9 | scanf("%d", &a); 10 | printf("a = %d\n", a); //打印a的值 11 | 12 | return 0; 13 | } 14 | -------------------------------------------------------------------------------- /code/2/2.2.3: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/2/2.2.3 -------------------------------------------------------------------------------- /code/2/2.2.3.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | short a = 10; 6 | int b = 10; 7 | long c = 10l; //或者10L 8 | long long d = 10ll; //或者10LL 9 | 10 | printf("sizeof(a) = %u\n", sizeof(a)); 11 | printf("sizeof(b) = %u\n", sizeof(b)); 12 | printf("sizeof(c) = %u\n", sizeof(c)); 13 | printf("sizeof(c) = %u\n", sizeof(d)); 14 | 15 | printf("short a = %hd\n", a); 16 | printf("int b = %d\n", b); 17 | printf("long c = %ld\n", c); 18 | printf("long long d = %lld\n", d); 19 | 20 | unsigned short a2 = 20u; 21 | unsigned int b2 = 20u; 22 | unsigned long c2= 20ul; 23 | unsigned long long d2 = 20ull; 24 | 25 | printf("unsigned short a = %hu\n", a2); 26 | printf("unsigned int b = %u\n", b2); 27 | printf("unsigned long c = %lu\n", c2); 28 | printf("unsigned long long d = %llu\n", d2); 29 | 30 | return 0; 31 | } 32 | 33 | -------------------------------------------------------------------------------- /code/2/2.2.4-1: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/2/2.2.4-1 -------------------------------------------------------------------------------- /code/2/2.2.4-1.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | signed int a = -1089474374; //定义有符号整型变量a 6 | printf("%X\n", a); //结果为 BF0FF0BA 7 | 8 | //B F 0 F F 0 B A 9 | //1011 1111 0000 1111 1111 0000 1011 1010 10 | 11 | return 0; 12 | } 13 | 14 | -------------------------------------------------------------------------------- /code/2/2.3: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/2/2.3 -------------------------------------------------------------------------------- /code/2/2.3.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | int a; 6 | int b = sizeof(a);//sizeof得到指定值占用内存的大小，单位：字节 7 | printf("b = %d\n", b); 8 | 9 | size_t c = sizeof(a); 10 | printf("c = %u\n", c);//用无符号数的方式输出c的值 11 | 12 | return 0; 13 | } 14 | 15 | -------------------------------------------------------------------------------- /code/2/2.4.1: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/2/2.4.1 -------------------------------------------------------------------------------- /code/2/2.4.1.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | char ch = 'a'; 6 | printf("sizeof(ch) = %u\n", sizeof(ch)); 7 | 8 | printf("ch[%%c] = %c\n", ch); //打印字符 9 | printf("ch[%%d] = %d\n", ch); //打印‘a’ ASCII的值 10 | 11 | char A = 'A'; 12 | char a = 'a'; 13 | printf("a = %d\n", a); //97 14 | printf("A = %d\n", A); //65 15 | 16 | printf("A = %c\n", 'a' - 32); //小写a转大写A 17 | printf("a = %c\n", 'A' + 32); //大写A转小写a 18 | 19 | ch = ' '; 20 | printf("空字符：%d\n", ch); //空字符ASCII的值为32 21 | printf("A = %c\n", 'a' - ' '); //小写a转大写A 22 | printf("a = %c\n", 'A' + ' '); //大写A转小写a 23 | 24 | return 0; 25 | } 26 | 27 | -------------------------------------------------------------------------------- /code/2/2.4.2: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/2/2.4.2 -------------------------------------------------------------------------------- /code/2/2.4.2.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | char ch; 6 | printf("请输入ch的值："); 7 | 8 | //不要加“\n” 9 | scanf("%c", &ch); 10 | printf("ch = %c\n", ch); //打印ch的字符 11 | 12 | return 0; 13 | } 14 | -------------------------------------------------------------------------------- /code/2/2.4.4: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/2/2.4.4 -------------------------------------------------------------------------------- /code/2/2.4.4.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | printf("abc"); 6 | printf("\refg\n"); //\r切换到句首， \n为换行键 7 | 8 | printf("abc"); 9 | printf("\befg\n");//\b为退格键， \n为换行键 10 | 11 | printf("%d\n", '\123');// '\123'为8进制转义字符，0123对应10进制数为83 12 | printf("%d\n", '\x23');// '\x23'为16进制转义字符，0x23对应10进制数为35 13 | 14 | return 0; 15 | } 16 | 17 | -------------------------------------------------------------------------------- /code/2/2.5: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/2/2.5 -------------------------------------------------------------------------------- /code/2/2.5.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | //传统方式赋值 6 | float a = 3.14f; //或3.14F 7 | double b = 3.14; 8 | 9 | printf("a = %f\n", a); 10 | printf("b = %lf\n", b); 11 | 12 | //科学法赋值 13 | a = 3.2e3f; //3.2*1000 = 3200，e可以写E 14 | printf("a1 = %f\n", a); 15 | 16 | a = 100e-3f; //100*0.001 = 0.1 17 | printf("a2 = %f\n", a); 18 | 19 | a = 3.1415926f; 20 | printf("a3 = %f\n", a); //结果为3.141593 21 | 22 | return 0; 23 | } 24 | -------------------------------------------------------------------------------- /code/2/2.6.4: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/2/2.6.4 -------------------------------------------------------------------------------- /code/2/2.6.4.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | int a = 123; //十进制方式赋值 6 | int b = 0123; //八进制方式赋值， 以数字0开头 7 | int c = 0xABC; //十六进制方式赋值 8 | 9 | //如果在printf中输出一个十进制数那么用%d，八进制用%o，十六进制是%x 10 | printf("十进制：%d\n",a ); 11 | printf("八进制：%o\n", b); //%o,为字母o,不是数字 12 | printf("十六进制：%x\n", c); 13 | 14 | return 0; 15 | } 16 | 17 | -------------------------------------------------------------------------------- /code/2/2.7.5: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/2/2.7.5 -------------------------------------------------------------------------------- /code/2/2.7.5.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | char ch; 6 | 7 | //符号位溢出会导致数的正负发生改变 8 | ch = 0x7f + 2; //127+2 9 | printf("%d\n", ch); 10 | // 0111 1111 11 | //+2后 1000 0001，这是负数补码，其原码为 1111 1111，结果为-127 12 | 13 | //最高位的溢出会导致最高位丢失 14 | unsigned char ch2; 15 | ch2 = 0xff+1; //255+1 16 | printf("%u\n", ch2); 17 | // 1111 1111 18 | //+1后 10000 0000， char只有8位最高位的溢出，结果为0000 0000，十进制为0 19 | 20 | ch2 = 0xff + 2; //255+1 21 | printf("%u\n", ch2); 22 | // 1111 1111 23 | //+1后 10000 0001， char只有8位最高位的溢出，结果为0000 0001，十进制为1 24 | 25 | return 0; 26 | } 27 | -------------------------------------------------------------------------------- /code/2/2.9.2: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/2/2.9.2 -------------------------------------------------------------------------------- /code/2/2.9.2.c: -------------------------------------------------------------------------------- 1 | #include 2 | int main() 3 | { 4 | int a = 100; 5 | printf("a = %d\n", a);//格式化输出一个字符串 6 | printf("%p\n", &a);//输出变量a在内存中的地址编号 7 | printf("%%d\n"); 8 | 9 | char c = 'a'; 10 | putchar(c);//putchar只有一个参数，就是要输出的char 11 | long a2 = 100; 12 | printf("%ld, %lx, %lo\n", a2, a2, a2); 13 | 14 | long long a3 = 1000; 15 | printf("%lld, %llx, %llo\n", a3, a3, a3); 16 | 17 | int abc = 10; 18 | printf("abc = '%6d'\n", abc); 19 | printf("abc = '%-6d'\n", abc); 20 | printf("abc = '%06d'\n", abc); 21 | printf("abc = '%-06d'\n", abc); 22 | 23 | double d = 12.3; 24 | printf("d = \' %-10.3lf \'\n", d); 25 | 26 | return 0; 27 | } 28 | -------------------------------------------------------------------------------- /code/2/2.9.3: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/2/2.9.3 -------------------------------------------------------------------------------- /code/2/2.9.3.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | char ch1; 6 | char ch2; 7 | char ch3; 8 | int a; 9 | int b; 10 | 11 | printf("请输入ch1的字符："); 12 | ch1 = getchar(); 13 | printf("ch1 = %c\n", ch1); 14 | 15 | getchar(); //测试此处getchar()的作用 16 | 17 | printf("请输入ch2的字符："); 18 | ch2 = getchar(); 19 | printf("\'ch2 = %ctest\'\n", ch2); 20 | 21 | getchar(); //测试此处getchar()的作用 22 | printf("请输入ch3的字符："); 23 | scanf("%c", &ch3);//这里第二个参数一定是变量的地址，而不是变量名 24 | printf("ch3 = %c\n", ch3); 25 | 26 | printf("请输入a的值："); 27 | scanf("%d", &a); 28 | printf("a = %d\n", a); 29 | 30 | printf("请输入b的值："); 31 | scanf("%d", &b); 32 | printf("b = %d\n", b); 33 | 34 | return 0; 35 | } 36 | 37 | -------------------------------------------------------------------------------- /code/3/3.7.1: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/3/3.7.1 -------------------------------------------------------------------------------- /code/3/3.7.1.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main(){ 4 | int num = 5; 5 | printf("S1 = %d\n", num / 2); 6 | printf("S2 = %lf\n", num / 2.0); 7 | 8 | return 0; 9 | } 10 | -------------------------------------------------------------------------------- /code/3/3.7.2: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/3/3.7.2 -------------------------------------------------------------------------------- /code/3/3.7.2.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main(){ 4 | float x = 0; 5 | int i = 0; 6 | x = 3.6f; 7 | 8 | i = x; 9 | i = (int)x; 10 | 11 | printf("x=%f, i=%d\n", x, i); 12 | 13 | return 0; 14 | } 15 | -------------------------------------------------------------------------------- /code/4/4.2.5: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/4/4.2.5 -------------------------------------------------------------------------------- /code/4/4.2.5.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | char c; 6 | c = getchar(); 7 | 8 | switch (c) //参数只能是整型变量 9 | { 10 | case '1': 11 | printf("OK\n"); 12 | break;//switch遇到break就中断了 13 | case '2': 14 | printf("not OK\n"); 15 | break; 16 | default://如果上面的条件都不满足，那么执行default 17 | printf("are u ok?\n"); 18 | } 19 | return 0; 20 | } 21 | -------------------------------------------------------------------------------- /code/4/4.3.1: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/4/4.3.1 -------------------------------------------------------------------------------- /code/4/4.3.1.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | int i = 0; 6 | while (1) 7 | { 8 | i++; 9 | printf("i = %d\n", i); 10 | 11 | if (i == 10) 12 | { 13 | break; //跳出while循环 14 | } 15 | } 16 | 17 | int flag = 0; 18 | int m = 0; 19 | int n = 0; 20 | 21 | for (m = 0; m < 10; m++) 22 | { 23 | for (n = 0; n < 10; n++) 24 | { 25 | if (n == 5) 26 | { 27 | flag = 1; 28 | break; //跳出for (n = 0; n < 10; n++) 29 | } 30 | } 31 | 32 | if (flag == 1) 33 | { 34 | break; //跳出for (m = 0; m < 10; m++) 35 | } 36 | } 37 | 38 | return 0; 39 | } 40 | 41 | -------------------------------------------------------------------------------- /code/4/4.4.2: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/4/4.4.2 -------------------------------------------------------------------------------- /code/4/4.4.2.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | int sum = 0; //定义变量sum 6 | 7 | for (int i = 1; i <= 100; i++) 8 | { 9 | if (i % 2 == 0) //如果i是一个偶数，执行if语句中的代码 10 | { 11 | continue; //结束本次循环 12 | } 13 | sum += i; //实现sum和i的累加 14 | } 15 | 16 | printf("sum = %d\n", sum); 17 | 18 | return 0; 19 | } 20 | 21 | -------------------------------------------------------------------------------- /code/4/4.4.3: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/4/4.4.3 -------------------------------------------------------------------------------- /code/4/4.4.3.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | goto End; //无条件跳转到End的标识 6 | printf("aaaaaaaaa\n"); 7 | 8 | End: 9 | printf("bbbbbbbb\n"); 10 | 11 | return 0; 12 | } 13 | -------------------------------------------------------------------------------- /code/5/5.2.1: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/5/5.2.1 -------------------------------------------------------------------------------- /code/5/5.2.1.c: -------------------------------------------------------------------------------- 1 | #include 2 | int main(){ 3 | int a[10]; 4 | a[0] = 0; 5 | 6 | a[9] = 9; 7 | 8 | int i = 0; 9 | for(i=0;i<10;i++){ 10 | a[i] = i; 11 | } 12 | 13 | for(i=0;i<10;i++){ 14 | printf("%d", a[i]); 15 | } 16 | printf("\n"); 17 | 18 | return 0; 19 | } 20 | -------------------------------------------------------------------------------- /code/5/5.2.3: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/5/5.2.3 -------------------------------------------------------------------------------- /code/5/5.2.3.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main(){ 4 | int a[10] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; 5 | // 定义一个数组，同时初始化所有成员变量 6 | printf("a = %p\n", a); 7 | printf("&a[0]=%p\n", &a[0]); 8 | 9 | int n = sizeof(a); 10 | int n0 = sizeof(a[0]); 11 | 12 | int i = 0; 13 | for(i = 0;i < sizeof(a) / sizeof(a[0]); i++){ 14 | printf("%d", a[i]); 15 | } 16 | printf("\n"); 17 | 18 | return 0; 19 | } 20 | -------------------------------------------------------------------------------- /code/5/5.2.4-1: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/5/5.2.4-1 -------------------------------------------------------------------------------- /code/5/5.2.4-1.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main(){ 4 | int a[] = {1, -2, 3, -4, 5, -6, 7, -8, -9, 10}; 5 | int i = 0; 6 | int max = a[0]; 7 | for(i=1;i max){ 9 | max = a[i]; 10 | } 11 | } 12 | 13 | printf("数组中最大值为:%d\n", max); 14 | 15 | return 0; 16 | } 17 | -------------------------------------------------------------------------------- /code/5/5.2.4-2: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/5/5.2.4-2 -------------------------------------------------------------------------------- /code/5/5.2.4-2.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main(){ 4 | int a[] = { 1, -2, 3,- 4, 5, -6, 7, -8, -9, 10 }; 5 | int i = 0; 6 | int j = sizeof(a) / sizeof(a[0]) - 1; 7 | int tmp; 8 | 9 | while (i < j){ 10 | tmp = a[i]; 11 | a[i] = a[j]; 12 | a[j] = tmp; 13 | i++; 14 | j--; 15 | } 16 | for(i = 0; i < sizeof(a)/sizeof(a[0]); i++){ 17 | printf("%d, ", a[i]); 18 | } 19 | printf("\n"); 20 | 21 | return 0; 22 | } 23 | -------------------------------------------------------------------------------- /code/5/5.2.4-3: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/5/5.2.4-3 -------------------------------------------------------------------------------- /code/5/5.2.4-3.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | int a[] = { 1, -2, 3,- 4, 5, -6, 7, -8, -9, 10 }; 6 | int i = 0; 7 | int j = 0; 8 | int n = sizeof(a)/sizeof(a[0]); 9 | int tmp; 10 | 11 | // 1. 流程 12 | // 2. 试数 13 | for(i = 0; i < n; i++) 14 | { 15 | for(j = 0; j < n - i - 1; j++) 16 | { 17 | if(a[j] > a[j+1]) 18 | { 19 | tmp = a[j]; 20 | a[j] = a[j+1]; 21 | a[j+1] = tmp; 22 | } 23 | } 24 | } 25 | 26 | for(i = 0; i < n; i++) 27 | { 28 | printf("%d",a[i]); 29 | } 30 | printf("\n"); 31 | 32 | return 0; 33 | 34 | } 35 | -------------------------------------------------------------------------------- /code/5/5.3.3: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/5/5.3.3 -------------------------------------------------------------------------------- /code/5/5.3.3.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | //定义了一个二维数组，名字叫a 6 | //二维数组是本质上还是一维数组，此一维数组有3个元素 7 | //每个元素又是一个一维数组int[4] 8 | int a[3][4] = { 1, 2, 3, 4 , 5, 6, 7, 8, 9, 10, 11, 12 }; 9 | 10 | //数组名为数组首元素地址，二维数组的第0个元素为一维数组 11 | //第0个一维数组的数组名为a[0] 12 | printf("a = %p\n", a); 13 | printf("a[0] = %p\n", a[0]); 14 | 15 | //测二维数组所占内存空间，有3个一维数组，每个一维数组的空间为4*4 16 | //sizeof(a) = 3 * 4 * 4 = 48 17 | printf("sizeof(a) = %d\n", sizeof(a)); 18 | 19 | //测第0个元素所占内存空间，a[0]为第0个一维数组int[4]的数组名，4*4=16 20 | printf("sizeof(a[0]) = %d\n", sizeof(a[0]) ); 21 | 22 | //测第0行0列元素所占内存空间，第0行0列元素为一个int类型，4字节 23 | printf("sizeof(a[0][0]) = %d\n", sizeof(a[0][0])); 24 | 25 | //求二维数组行数 26 | printf("i = %d\n", sizeof(a) / sizeof(a[0])); 27 | 28 | // 求二维数组列数 29 | printf("j = %d\n", sizeof(a[0]) / sizeof(a[0][0])); 30 | 31 | //求二维数组行*列总数 32 | printf("n = %d\n", sizeof(a) / sizeof(a[0][0])); 33 | 34 | return 0; 35 | } 36 | 37 | -------------------------------------------------------------------------------- /code/5/5.3.4: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/5/5.3.4 -------------------------------------------------------------------------------- /code/5/5.3.4.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | //二维数组： 五行、三列 6 | //行代表人： 老大到老五 7 | //列代表科目：语、数、外 8 | 9 | float a[5][3] = { { 80, 75, 56 }, { 59, 65, 71 }, { 59, 63, 70 }, { 85, 45, 90 }, { 76, 77, 45 } }; 10 | 11 | int i,j,person_low[3] = {0}; 12 | float s=0,lesson_aver[3] = {0}; 13 | 14 | for(i = 0; i < 3; i++) 15 | { 16 | for(j = 0;j < 5; j++) 17 | { 18 | s = s + a[i][j]; 19 | if(a[i][j] < 60) 20 | { 21 | person_low[i]++; 22 | } 23 | } 24 | lesson_aver[i] = s/5; 25 | s = 0; 26 | } 27 | printf("各科的平均成绩:\n"); 28 | for (i = 0; i < 3; i++) 29 | { 30 | printf("%.2f\n", lesson_aver[i]); 31 | } 32 | 33 | printf("各科不及格的人数:\n"); 34 | for (i = 0; i < 3; i++) 35 | { 36 | printf("%d\n", person_low[i]); 37 | } 38 | 39 | return 0; 40 | } 41 | -------------------------------------------------------------------------------- /code/5/5.4: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/5/5.4 -------------------------------------------------------------------------------- /code/5/5.4.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main(){ 4 | // int a[3][4][5]; //定义了一个三维数组，有3个二维数组int[4][5] 5 | int a[3][4][5] = { { { 1, 2, 3, 4, 5 }, { 6, 7, 8, 9, 10 }, { 0 }, { 0 } }, { { 0 }, { 0 }, { 0 }, { 0 } }, { { 0 }, { 0 }, { 0 }, { 0 } } }; 6 | int i, j, k; 7 | for (i = 0; i < 3; i++) 8 | { 9 | for (j = 0; j < 4; j++) 10 | { 11 | for (k = 0; k < 5; k++) 12 | { 13 | //添加访问元素代码 14 | printf("%d, ", a[i][j][k]); 15 | } 16 | printf("\n"); 17 | } 18 | } 19 | return 0; 20 | } 21 | -------------------------------------------------------------------------------- /code/5/5.5.1: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/5/5.5.1 -------------------------------------------------------------------------------- /code/5/5.5.1.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | char c1[] = { 'c', ' ', 'p', 'r', 'o', 'g' }; //普通字符数组 6 | printf("c1 = %s\n", c1); //乱码，因为没有’\0’结束符 7 | 8 | //以‘\0’(‘\0’就是数字0)结尾的字符数组是字符串 9 | char c2[] = { 'c', ' ', 'p', 'r', 'o', 'g', '\0'}; 10 | printf("c2 = %s\n", c2); 11 | 12 | //字符串处理以‘\0’(数字0)作为结束符，后面的'h', 'l', 'l', 'e', 'o'不会输出 13 | char c3[] = { 'c', ' ', 'p', 'r', 'o', 'g', '\0', 'h', 'l', 'l', 'e', 'o', '\0'}; 14 | printf("c3 = %s\n", c3); 15 | 16 | return 0; 17 | } 18 | -------------------------------------------------------------------------------- /code/5/5.5.2.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | // C语言没有字符串类型，通过字符数组模拟 4 | // C语言字符串，以字符'\0', 数字0 5 | 6 | int main() 7 | { 8 | //不指定长度, 没有0结束符，有多少个元素就有多长 9 | char buf[] = {'a', 'b', 'c'}; 10 | printf("buf = %s\n", buf); //乱码 11 | 12 | //指定长度，后面没有赋值的元素，自动补0 13 | char buf2[100] = { 'a', 'b', 'c' }; 14 | char buf[1000]={"hello"}; 15 | printf("buf2 = %s\n", buf2); 16 | 17 | //所有元素赋值为0 18 | char buf3[100] = { 0 }; 19 | //char buf4[2] = { '1', '2', '3' };//数组越界 20 | char buf5[50] = { '1', 'a', 'b', '0', '7' }; 21 | printf("buf5 = %s\n", buf5); 22 | 23 | char buf6[50] = { '1', 'a', 'b', 0, '7' }; 24 | printf("buf6 = %s\n", buf6); 25 | 26 | char buf7[50] = { '1', 'a', 'b', '\0', '7' }; 27 | printf("buf7 = %s\n", buf7); 28 | 29 | //使用字符串初始化，编译器自动在后面补0，常用 30 | char buf8[] = "agjdslgjlsdjg"; 31 | 32 | //'\0'后面最好不要连着数字，有可能几个数字连起来刚好是一个转义字符 33 | //'\ddd'八进制字义字符，'\xdd'十六进制转移字符 34 | // \012相当于\n 35 | char str[] = "\012abc"; 36 | printf("str == %s\n", str); 37 | 38 | return 0; 39 | 40 | } 41 | -------------------------------------------------------------------------------- /code/5/5.5.3-5: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/5/5.5.3-5 -------------------------------------------------------------------------------- /code/5/5.5.3-5.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | 4 | int main() 5 | { 6 | char str[] = "abc\0defg"; 7 | int n = strlen(str); 8 | printf("n = %d\n", n); 9 | 10 | return 0; 11 | } 12 | -------------------------------------------------------------------------------- /code/6/6.1.2: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/6/6.1.2 -------------------------------------------------------------------------------- /code/6/6.1.2.c: -------------------------------------------------------------------------------- 1 | #include 2 | // 求两数的最大值 3 | int max(int a, int b) 4 | { 5 | if (a > b) 6 | { 7 | return a; 8 | } 9 | else 10 | { 11 | return b; 12 | } 13 | } 14 | 15 | int main() 16 | { 17 | int a1 = 10, b1 = 20, c1 = 0; 18 | c1 = max(a1, b1); // 调用max() 19 | 20 | int a2 = 11, b2 = 21, c2 = 0; 21 | c2 = max(a2, b2); 22 | 23 | 24 | printf("c1= %d, c2 = %d\n",c1, c2); 25 | return 0; 26 | } 27 | -------------------------------------------------------------------------------- /code/7/7.2.1: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/7/7.2.1 -------------------------------------------------------------------------------- /code/7/7.2.1.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | int a = 0; 6 | char b = 100; 7 | 8 | printf("%p, %p\n", &a, &b); 9 | 10 | int *p; 11 | p = &a; 12 | 13 | printf("%d\n", *p); 14 | 15 | char *p1 = &b; 16 | printf("%d\n", *p1); 17 | 18 | return 0; 19 | } 20 | -------------------------------------------------------------------------------- /code/7/7.2.3: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/7/7.2.3 -------------------------------------------------------------------------------- /code/7/7.2.3.c: -------------------------------------------------------------------------------- 1 | #include 2 | int main() 3 | { 4 | int *p1; 5 | int **p2; 6 | char *p3; 7 | char **p4; 8 | 9 | printf("sizeof(p1) = %d\n", sizeof(p1)); 10 | printf("sizeof(p2) = %d\n", sizeof(p2)); 11 | printf("sizeof(p3) = %d\n", sizeof(p3)); 12 | printf("sizeof(p4) = %d\n", sizeof(p4)); 13 | printf("sizeof(double *) = %d\n", sizeof(double *)); 14 | 15 | return 0; 16 | } 17 | -------------------------------------------------------------------------------- /code/7/7.3.2: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/7/7.3.2 -------------------------------------------------------------------------------- /code/7/7.3.2.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | int a[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; 6 | int i = 0; 7 | int n = sizeof(a)/sizeof(a[0]); 8 | 9 | for(i = 0; i < n; i++) 10 | { 11 | // printf("%d, " a[i]); 12 | printf("%d,", *(a+i)); 13 | } 14 | printf("\n"); 15 | 16 | int *p = a; 17 | for(i = 0; i < n; i++) 18 | { 19 | p[i] = 2 * i; 20 | } 21 | 22 | for(i = 0; i < n; i++) 23 | { 24 | printf("%d", *(p+i)); 25 | } 26 | printf("\n"); 27 | 28 | return 0; 29 | 30 | } 31 | -------------------------------------------------------------------------------- /code/7/7.3.3-2: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/7/7.3.3-2 -------------------------------------------------------------------------------- /code/7/7.3.3-2.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | int a[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; 6 | int i = 0; 7 | int n = sizeof(a) / sizeof(a[0]); 8 | 9 | int *p = a+n-1; 10 | for (i = 0; i < n; i++) 11 | { 12 | printf("%d, ", *p); 13 | p--; 14 | } 15 | printf("\n"); 16 | 17 | return 0; 18 | } 19 | 20 | -------------------------------------------------------------------------------- /code/7/7.5.1: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/7/7.5.1 -------------------------------------------------------------------------------- /code/7/7.5.1.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | void swap1(int x, int y) 4 | { 5 | int tmp; 6 | tmp = x; 7 | x = y; 8 | y = tmp; 9 | printf("x=%d, y=%d\n", x, y); 10 | } 11 | void swap2(int *x, int *y) 12 | { 13 | int tmp; 14 | tmp = *x; 15 | *x = *y; 16 | *y = tmp; 17 | } 18 | int main() 19 | { 20 | int a = 3; 21 | int b = 5; 22 | swap1(a, b); // 值传递 23 | printf("a = %d, b = %d\n", a, b); 24 | 25 | a = 3; 26 | b = 5; 27 | swap2(&a, &b); // 地址传递 28 | printf("a2 = %d, b2=%d\n", a, b); 29 | 30 | return 0; 31 | } 32 | -------------------------------------------------------------------------------- /code/7/7.5.2: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/7/7.5.2 -------------------------------------------------------------------------------- /code/7/7.5.2.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | void printArrary(int *a, int n) 4 | { 5 | int i = 0; 6 | for (i = 0; i < n; i++) 7 | { 8 | printf("%d, ", a[i]); 9 | } 10 | printf("\n"); 11 | } 12 | 13 | int main() 14 | { 15 | int a[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; 16 | int n = sizeof(a) / sizeof(a[0]); 17 | 18 | //数组名做函数参数 19 | printArrary(a, n); 20 | return 0; 21 | } 22 | -------------------------------------------------------------------------------- /code/7/7.5.3: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/7/7.5.3 -------------------------------------------------------------------------------- /code/7/7.5.3.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int a = 10; 4 | 5 | int *getA() 6 | { 7 | return &a; 8 | } 9 | 10 | int main() 11 | { 12 | *(getA()) = 111; 13 | printf("a = %d\n", a); 14 | // 输出： a = 111; 15 | return 0; 16 | } 17 | -------------------------------------------------------------------------------- /code/7/7.5.5-1-a: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/7/7.5.5-1-a -------------------------------------------------------------------------------- /code/7/7.5.5-1-a.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | 5 | int main(void) 6 | { 7 | char *p = "11abcd111122abcd333abcd3322abcd3333322qqq"; 8 | int n = 0; 9 | 10 | while((p = strstr(p, "abcd")) != NULL) 11 | { 12 | //能进来，肯定有匹配的子串 13 | //重新设置起点位置 14 | p = p + strlen("abcd"); 15 | n++; 16 | 17 | if(*p == 0) // 结束符 18 | { 19 | break; 20 | } 21 | } 22 | printf("n = %d\n", n); 23 | 24 | return 0; 25 | } 26 | -------------------------------------------------------------------------------- /code/7/7.6.1: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/7/7.6.1 -------------------------------------------------------------------------------- /code/7/7.6.1.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | char str[] = "hello world"; 6 | char *p = str; 7 | *p = 'm'; 8 | p++; 9 | *p='i'; 10 | printf("%s\n", str); 11 | 12 | p = "mike Tao"; 13 | printf("%s\n", p); 14 | 15 | char *q = "test"; 16 | printf("%s\n", q); 17 | 18 | return 0; 19 | } 20 | -------------------------------------------------------------------------------- /code/7/7.6.5-2: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/7/7.6.5-2 -------------------------------------------------------------------------------- /code/7/7.6.5-2.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | 6 | int fun(char *p, int *n) 7 | { 8 | if(p == NULL || n == NULL) 9 | { 10 | return -1; 11 | } 12 | int begin = 0; 13 | int end = strlen(p) - 1; 14 | 15 | //从左边开始 16 | //如果当前字符为空，而且没有结束 17 | while(p[begin] == ' ' && p[begin] != 0) 18 | { 19 | begin++; 20 | } 21 | 22 | //从右往左移动 23 | while (p[end] == ' ' && end > 0) 24 | { 25 | end--; //往左移动 26 | } 27 | 28 | 29 | if (end == 0) 30 | { 31 | return -2; 32 | } 33 | 34 | //非空元素个数 35 | *n = end - begin + 1; 36 | 37 | return 0; 38 | } 39 | 40 | 41 | int main(void) 42 | { 43 | char *p = " abcddsgadsgefg "; 44 | int ret = 0; 45 | int n = 0; 46 | 47 | ret = fun(p, &n); 48 | if(ret != 0) 49 | { 50 | return ret; 51 | } 52 | printf("非空字符串元素个数：%d\n", n); 53 | 54 | return 0; 55 | } 56 | -------------------------------------------------------------------------------- /code/7/7.6.5-3: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/7/7.6.5-3 -------------------------------------------------------------------------------- /code/7/7.6.5-3.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | 5 | int inverse(char *p) 6 | { 7 | if(p == NULL) 8 | { 9 | return -1; 10 | } 11 | char *str = p; 12 | int begin = 0; 13 | int end = strlen(str) - 1; 14 | char tmp; 15 | 16 | while(begin < end) 17 | { 18 | // 交换元素 19 | tmp = str[begin]; 20 | str[begin] = str[end]; 21 | str[end] = tmp; 22 | 23 | begin++; //往右移动位置 24 | end--; // 往左移动位置 25 | } 26 | 27 | return 0; 28 | } 29 | int main(void) 30 | { 31 | //char *str = "abcdefg"; //文件常量区，内容不允许修改 32 | char str[] = "abcdef"; 33 | 34 | int ret = inverse(str); 35 | 36 | if(ret != 0) 37 | { 38 | return ret; 39 | } 40 | 41 | printf("str = %s\n", str); 42 | 43 | return 0; 44 | } 45 | -------------------------------------------------------------------------------- /code/7/7.6.5.1-2: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/7/7.6.5.1-2 -------------------------------------------------------------------------------- /code/7/7.6.5.1-2.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | 5 | int main(void) 6 | { 7 | char *p = "11abcd111122abcd333abcd3322abcd3333322qqq"; 8 | int n = 0; 9 | 10 | do 11 | { 12 | p = strstr(p, "abcd"); 13 | if(p != NULL) 14 | { 15 | n++; 16 | // 重新设置查找的起点 17 | p = p + strlen("abcd"); 18 | } 19 | else 20 | { 21 | break; 22 | } 23 | }while(*p != 0); 24 | 25 | printf("n=%d\n", n); 26 | 27 | return 0; 28 | } 29 | -------------------------------------------------------------------------------- /code/7/7.6.6-9: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/7/7.6.6-9 -------------------------------------------------------------------------------- /code/7/7.6.6-9.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | 6 | char src[] = "ddda123abcd"; 7 | char *p = strchr(src, 'a'); 8 | printf("p = %s\n", p); 9 | 10 | return 0; 11 | } 12 | -------------------------------------------------------------------------------- /code/7/7.7.3: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/7/7.7.3 -------------------------------------------------------------------------------- /code/7/7.7.3.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | void mystract(char *dest, const char *src) 4 | { 5 | int len1 = 0; 6 | int len2 = 0; 7 | while(dest[len1]) 8 | { 9 | len1++; 10 | } 11 | while(src[len2]) 12 | { 13 | len2++; 14 | } 15 | int i; 16 | for(i = 0; i < len2; i++) 17 | { 18 | dest[len1 + i] = src[i]; 19 | } 20 | } 21 | 22 | int main() 23 | { 24 | char dst[100] = "hello mike"; 25 | char src[] = "123456"; 26 | 27 | mystract(dst,src); 28 | printf("dst = %s\n", dst); 29 | 30 | return 0; 31 | } 32 | -------------------------------------------------------------------------------- /code/8/8.1.2: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/8/8.1.2 -------------------------------------------------------------------------------- /code/8/8.1.2.c: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | void fun1() 4 | { 5 | int i = 0; 6 | i++; 7 | printf("i = %d\n", i); 8 | } 9 | void fun2() 10 | { 11 | // 静态局部变量，没有赋值，系统赋值为0，而且只会初始化一次 12 | static int a; 13 | a++; 14 | printf("a = %d\n"); 15 | } 16 | 17 | int main(void) 18 | { 19 | fun1(); 20 | fun1(); 21 | fun2(); 22 | fun2(); 23 | 24 | return 0; 25 | } 26 | -------------------------------------------------------------------------------- /code/8/8.2.2: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/8/8.2.2 -------------------------------------------------------------------------------- /code/8/8.2.2.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | 4 | int e; 5 | static int f; 6 | int g = 10; 7 | static int h = 10; 8 | 9 | int main() 10 | { 11 | int a; 12 | int b = 10; 13 | static int c; 14 | static int d = 10; 15 | char *i = "test"; 16 | char *k = NULL; 17 | 18 | printf("&a\t %p\t //局部未初始化变量\n", &a); 19 | printf("&b\t %p\t //局部初始化变量\n", &b); 20 | 21 | printf("&c\t %p\t //静态局部未初始化变量\n", &c); 22 | printf("&d\t %p\t //静态局部初始化变量\n", &d); 23 | 24 | printf("&e\t %p\t //全局未初始化变量\n", &e); 25 | printf("&f\t %p\t //全局静态未初始化变量\n", &f); 26 | 27 | printf("&g\t %p\t //全局初始化变量\n", &g); 28 | printf("&h\t %p\t //全局静态初始化变量\n", &h); 29 | 30 | printf("i\t %p\t //只读数据(文字常量区)\n", i); 31 | 32 | k = (char *)malloc(10); 33 | printf("k\t %p\t //动态分配的内存\n", k); 34 | 35 | return 0; 36 | 37 | } 38 | -------------------------------------------------------------------------------- /code/8/8.2.4-1: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Taonn/C-Learning/3038964345069aaa8113923e9f0f0585b13fe82c/code/8/8.2.4-1 -------------------------------------------------------------------------------- /code/8/8.2.4-1.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | 5 | int main() 6 | { 7 | int count, *array, n; 8 | printf("请输入要申请数组的个数：\n"); 9 | scanf("%d", &n); 10 | 11 | array = (int *)malloc(n * sizeof(int)); 12 | if(array == NULL) 13 | { 14 | printf("申请空间失败!\n"); 15 | return -1; 16 | } 17 | //将申请到空间清0 18 | memset(array, 0, sizeof(int)*n); 19 | 20 | for(count = 0; count < n; count++) 21 | array[count] = count; 22 | for(count = 0; count < n; count++) 23 | printf("%2d", array[count]); 24 | 25 | free(array); 26 | 27 | return 0; 28 | 29 | 30 | } 31 | -------------------------------------------------------------------------------- /code/9/10.5: -------------------------------------------------------------------------------- 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