├── .gitignore ├── LICENSE ├── README.md ├── c-program-to-find-maximum-and-minimum-range-of-data-types-using-macro.c ├── data ├── append.txt ├── compare1.txt ├── compare2.txt ├── copy-file.txt ├── even-numbers.txt ├── file1.txt ├── file2.txt ├── numbers.txt ├── odd-numbers.txt └── prime-numbers.txt └── src ├── file ├── append-data.c ├── compare-file.c ├── copy-file-contents.c ├── copy-file-using-function.c ├── create-and-write-contents-to-file.c ├── file-programming-example-list.md ├── read-from-file-using-fgetc.c ├── read-from-file-using-fgets.c └── read-numbers-write-even-odd-prime-to-separate-file.c └── stdlib ├── atof.c ├── atoi.c ├── atol.c ├── atoll.c ├── strtol.c ├── strtoll.c ├── strtoul.c └── strtoull.c /.gitignore: -------------------------------------------------------------------------------- 1 | # Ignore bin directory 2 | /bin/ 3 | c-programming-ws.code-workspace 4 | .vscode/* 5 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | {project} Copyright (C) {year} {fullname} 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Codeforwin C programming 2 | Codeforwin is a platform for learning, practicing and sharing coding skills. 3 | 4 | A blog about computer science, for computer science learner – by computer science lover. -------------------------------------------------------------------------------- /c-program-to-find-maximum-and-minimum-range-of-data-types-using-macro.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @author Pankaj Prakash 3 | * @website http://www.codeforwin.in/ 4 | * @lastmodified 12:24 AM, January 5, 2017 5 | * @description C program to find the minimum and maximum limits of data types. 6 | * This program make use of pre-defined macros to get the maximum and 7 | * and minimum limits of the types. These macros are defined in two 8 | * header files limits.h and float.h 9 | * ------------------------------------------------------------------------------------- */ 10 | 11 | #include 12 | #include 13 | #include 14 | 15 | int main() 16 | { 17 | /* Character types */ 18 | printf("Minimum limit of signed char = %d\n", SCHAR_MIN); 19 | printf("Maximum limit of signed char = %d\n", SCHAR_MAX); 20 | printf("Maximum limit of unsigned char = %d\n\n", UCHAR_MAX); 21 | 22 | /* Short integer types */ 23 | printf("Minimum limit of signed short int = %d\n", SHRT_MIN); 24 | printf("Maximum limit of signed short int = %d\n", SHRT_MAX); 25 | printf("Maximum limit of unsigned short int = %d\n\n", USHRT_MAX); 26 | 27 | /* Integer types */ 28 | printf("Minimum limit of signed int = %d\n", INT_MIN); 29 | printf("Maximum limit of signed int = %d\n", INT_MAX); 30 | printf("Maximum limit of unsigned int = %lld\n\n", UINT_MAX); 31 | 32 | /* Long integer types */ 33 | printf("Minimum limit of signed long int = %ld\n", LONG_MIN); 34 | printf("Maximum limit of signed long int = %ld\n", LONG_MAX); 35 | printf("Maximum limit of unsigned long int = %lld\n\n", ULONG_MAX); 36 | 37 | /* Long long integer types */ 38 | printf("Minimum limit of signed long long int = %lld\n", LONG_LONG_MIN); // LLONG_MIN on some compilers 39 | printf("Maximum limit of signed long long int = %lld\n", LONG_LONG_MAX); // LLONG_MAX on some compilers 40 | printf("Maximum limit of unsigned long long int = %llu\n\n", ULONG_LONG_MAX); // ULLONG_MAX on some compilers 41 | 42 | /* Float types */ 43 | printf("Minimum limit of float = %e\n", FLT_MIN); 44 | printf("Maximum limit of float = %e\n\n", FLT_MAX); 45 | 46 | /* Double types */ 47 | printf("Minimum limit of double = %e\n", DBL_MIN); 48 | printf("Maximum limit of double = %e\n\n", DBL_MAX); 49 | 50 | /* Long double types */ 51 | printf("Minimum limit of long double = %e\n", LDBL_MIN); 52 | printf("Maximum limit of long double = %e\n", LDBL_MAX); 53 | 54 | return 0; 55 | } 56 | -------------------------------------------------------------------------------- /data/append.txt: -------------------------------------------------------------------------------- 1 | I love programming. 2 | Programming with files is fun. 3 | Learning C programming at Codeforwin is simple and easy. 4 | -------------------------------------------------------------------------------- /data/compare1.txt: -------------------------------------------------------------------------------- 1 | Learn C programming at Codeforwin. 2 | Working with files and directories. -------------------------------------------------------------------------------- /data/compare2.txt: -------------------------------------------------------------------------------- 1 | Learn C programming at Codeforwin. 2 | Working with array and pointers. -------------------------------------------------------------------------------- /data/copy-file.txt: -------------------------------------------------------------------------------- 1 | Reading a file line by line. 2 | -------------------------------------------- 3 | I love programming in C. 4 | Learning programming on Codeforwin is easy. -------------------------------------------------------------------------------- /data/even-numbers.txt: -------------------------------------------------------------------------------- 1 | 73771782 2 | 79982326 3 | 75332246 4 | 76259734 5 | 94432076 6 | 50063976 7 | 42311916 8 | -1920042 9 | 90747362 10 | 53851612 11 | 59322952 12 | 59322952 13 | -------------------------------------------------------------------------------- /data/file1.txt: -------------------------------------------------------------------------------- 1 | Hurray!!! I learned to create file in C programming. I also learned to write contents to file. Next, I will learn to read contents from file on Codefrowin. Happy coding ;) 2 | -------------------------------------------------------------------------------- /data/file2.txt: -------------------------------------------------------------------------------- 1 | Reading a file line by line. 2 | -------------------------------------------- 3 | I love programming in C. 4 | Learning programming on Codeforwin is easy. -------------------------------------------------------------------------------- /data/numbers.txt: -------------------------------------------------------------------------------- 1 | 73771782 81296771 79982326 75332246 10128193 2 | 81643413 76259734 94432076 50063976 91748657 3 | 42311916 -1920042 90747362 53851612 43498487 4 | 73193311 96685173 39019033 8630045 59322952 5 | -------------------------------------------------------------------------------- /data/odd-numbers.txt: -------------------------------------------------------------------------------- 1 | 81296771 2 | 81643413 3 | 91748657 4 | 43498487 5 | 96685173 6 | 8630045 7 | -------------------------------------------------------------------------------- /data/prime-numbers.txt: -------------------------------------------------------------------------------- 1 | 10128193 2 | 73193311 3 | 39019033 4 | -------------------------------------------------------------------------------- /src/file/append-data.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @author Pankaj Prakash 3 | * @website http://codeforwin.org/2018/02/c-program-append-data-file.html 4 | * @description C program to append data to file 5 | * ----------------------------------------------------------------------------------------- */ 6 | 7 | #include 8 | #include 9 | 10 | #define BUFFER_SIZE 1000 11 | 12 | 13 | void readFile(FILE * fPtr); 14 | 15 | 16 | int main() 17 | { 18 | /* File pointer to hold reference of input file */ 19 | FILE *fPtr; 20 | char filePath[100]; 21 | 22 | char dataToAppend[BUFFER_SIZE]; 23 | 24 | 25 | /* Input file path to remove empty lines from user */ 26 | printf("Enter file path: "); 27 | scanf("%s", filePath); 28 | 29 | /* Open all file in append mode. */ 30 | fPtr = fopen(filePath, "a"); 31 | 32 | 33 | /* fopen() return NULL if unable to open file in given mode. */ 34 | if (fPtr == NULL) 35 | { 36 | /* Unable to open file hence exit */ 37 | printf("\nUnable to open '%s' file.\n", filePath); 38 | printf("Please check whether file exists and you have write privilege.\n"); 39 | exit(EXIT_SUCCESS); 40 | } 41 | 42 | 43 | /* Input string to append from user */ 44 | printf("\nEnter data to append: "); 45 | fflush(stdin); // To clear extra white space characters in stdin 46 | fgets(dataToAppend, BUFFER_SIZE, stdin); 47 | 48 | 49 | /* Append data to file */ 50 | fputs(dataToAppend, fPtr); 51 | 52 | 53 | /* Reopen file in read mode to print file contents */ 54 | fPtr = freopen(filePath, "r", fPtr); 55 | 56 | /* Print file contents after appending string */ 57 | printf("\nSuccessfully appended data to file. \n"); 58 | printf("Changed file contents:\n\n"); 59 | readFile(fPtr); 60 | 61 | 62 | /* Done with file, hence close file. */ 63 | fclose(fPtr); 64 | 65 | return 0; 66 | } 67 | 68 | 69 | 70 | /** 71 | * Reads a file character by character 72 | * and prints on console. 73 | * 74 | * @fPtr Pointer to FILE to read. 75 | */ 76 | void readFile(FILE * fPtr) 77 | { 78 | char ch; 79 | 80 | do 81 | { 82 | ch = fgetc(fPtr); 83 | 84 | putchar(ch); 85 | 86 | } while (ch != EOF); 87 | } -------------------------------------------------------------------------------- /src/file/compare-file.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @author Pankaj Prakash 3 | * @website http://codeforwin.org/2018/02/c-program-compare-two-files.html 4 | * @description C program to compare two files. 5 | * ----------------------------------------------------------------------------------------- */ 6 | 7 | #include 8 | #include 9 | 10 | 11 | /* Function declaration */ 12 | int compareFile(FILE * fPtr1, FILE * fPtr2, int * line, int * col); 13 | 14 | 15 | int main() 16 | { 17 | /* File pointer to hold reference of input file */ 18 | FILE * fPtr1; 19 | FILE * fPtr2; 20 | char path1[100]; 21 | char path2[100]; 22 | 23 | int diff; 24 | int line, col; 25 | 26 | 27 | /* Input path of files to compare */ 28 | printf("Enter path of first file: "); 29 | scanf("%s", path1); 30 | printf("Enter path of second file: "); 31 | scanf("%s", path2); 32 | 33 | 34 | /* Open all files to compare */ 35 | fPtr1 = fopen(path1, "r"); 36 | fPtr2 = fopen(path2, "r"); 37 | 38 | /* fopen() return NULL if unable to open file in given mode. */ 39 | if (fPtr1 == NULL || fPtr2 == NULL) 40 | { 41 | /* Unable to open file hence exit */ 42 | printf("\nUnable to open file.\n"); 43 | printf("Please check whether file exists and you have read privilege.\n"); 44 | exit(EXIT_SUCCESS); 45 | } 46 | 47 | 48 | /* Call function to compare file */ 49 | diff = compareFile(fPtr1, fPtr2, &line, &col); 50 | 51 | if (diff == 0) 52 | { 53 | printf("\nBoth files are equal."); 54 | } 55 | else 56 | { 57 | printf("\nFiles are not equal.\n"); 58 | printf("Line: %d, col: %d\n", line, col); 59 | } 60 | 61 | 62 | /* Finally close files to release resources */ 63 | fclose(fPtr1); 64 | fclose(fPtr2); 65 | 66 | return 0; 67 | } 68 | 69 | 70 | /** 71 | * Function to compare two files. 72 | * Returns 0 if both files are equivalent, otherwise returns 73 | * -1 and sets line and col where both file differ. 74 | */ 75 | int compareFile(FILE * fPtr1, FILE * fPtr2, int * line, int * col) 76 | { 77 | char ch1, ch2; 78 | 79 | *line = 1; 80 | *col = 0; 81 | 82 | do 83 | { 84 | // Input character from both files 85 | ch1 = fgetc(fPtr1); 86 | ch2 = fgetc(fPtr2); 87 | 88 | // Increment line 89 | if (ch1 == '\n') 90 | { 91 | *line += 1; 92 | *col = 0; 93 | } 94 | 95 | // If characters are not same then return -1 96 | if (ch1 != ch2) 97 | return -1; 98 | 99 | *col += 1; 100 | 101 | } while (ch1 != EOF && ch2 != EOF); 102 | 103 | 104 | /* If both files have reached end */ 105 | if (ch1 == EOF && ch2 == EOF) 106 | return 0; 107 | else 108 | return -1; 109 | } -------------------------------------------------------------------------------- /src/file/copy-file-contents.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @author Pankaj Prakash 3 | * @website http://codeforwin.org/2018/02/c-program-to-copy-file.html 4 | * @description C program to copy contents of one file to another. 5 | * ----------------------------------------------------------------------------------------- */ 6 | 7 | #include 8 | #include 9 | 10 | 11 | int main() 12 | { 13 | /* File pointer to hold reference of input file */ 14 | FILE *sourceFile; 15 | FILE *destFile; 16 | char sourcePath[100]; 17 | char destPath[100]; 18 | 19 | char ch; 20 | 21 | /* Input path of files to compare */ 22 | printf("Enter source file path: "); 23 | scanf("%s", sourcePath); 24 | printf("Enter destination file path: "); 25 | scanf("%s", destPath); 26 | 27 | /* 28 | * Open source file in 'r' and 29 | * destination file in 'w' mode 30 | */ 31 | sourceFile = fopen(sourcePath, "r"); 32 | destFile = fopen(destPath, "w"); 33 | 34 | /* fopen() return NULL if unable to open file in given mode. */ 35 | if (sourceFile == NULL || destFile == NULL) 36 | { 37 | /* Unable to open file hence exit */ 38 | printf("\nUnable to open file.\n"); 39 | printf("Please check if file exists and you have read/write privilege.\n"); 40 | 41 | exit(EXIT_SUCCESS); 42 | } 43 | 44 | 45 | /* 46 | * Copy file contents character by character. 47 | */ 48 | ch = fgetc(sourceFile); 49 | while (ch != EOF) 50 | { 51 | /* Write to destination file */ 52 | fputc(ch, destFile); 53 | 54 | /* Read next character from source file */ 55 | ch = fgetc(sourceFile); 56 | } 57 | 58 | 59 | printf("\nFiles copied successfully.\n"); 60 | 61 | 62 | /* Finally close files to release resources */ 63 | fclose(sourceFile); 64 | fclose(destFile); 65 | 66 | return 0; 67 | } -------------------------------------------------------------------------------- /src/file/copy-file-using-function.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @author Pankaj Prakash 3 | * @website http://codeforwin.org/2018/02/c-program-to-copy-file.html 4 | * @description C program to copy contents of one file to another using functions. 5 | * ----------------------------------------------------------------------------------------- */ 6 | 7 | #include 8 | #include 9 | 10 | 11 | /* File copy function declaration */ 12 | int fcpy(FILE * sourceFile, FILE * destFile); 13 | 14 | 15 | int main() 16 | { 17 | /* File pointer to hold reference of input file */ 18 | FILE *sourceFile; 19 | FILE *destFile; 20 | char sourcePath[100]; 21 | char destPath[100]; 22 | 23 | int count; 24 | 25 | 26 | /* Input path of files to compare */ 27 | printf("Enter source file path: "); 28 | scanf("%s", sourcePath); 29 | printf("Enter destination file path: "); 30 | scanf("%s", destPath); 31 | 32 | /* 33 | * Open source file in 'r' and 34 | * destination file in 'w' mode 35 | */ 36 | sourceFile = fopen(sourcePath, "r"); 37 | destFile = fopen(destPath, "w"); 38 | 39 | /* fopen() return NULL if unable to open file in given mode. */ 40 | if (sourceFile == NULL || destFile == NULL) 41 | { 42 | /* Unable to open file hence exit */ 43 | printf("\nUnable to open file.\n"); 44 | printf("Please check if file exists and you have read/write privilege.\n"); 45 | 46 | exit(EXIT_SUCCESS); 47 | } 48 | 49 | 50 | // Call function to copy file 51 | count = fcpy(sourceFile, destFile); 52 | printf("\nFiles copied successfully.\n"); 53 | printf("%d characters copied.\n", count); 54 | 55 | 56 | /* Finally close files to release resources */ 57 | fclose(sourceFile); 58 | fclose(destFile); 59 | 60 | return 0; 61 | } 62 | 63 | 64 | 65 | /** 66 | * Copy file contents character by charcter from 67 | * one file to another. 68 | * It return total character copied count. 69 | * 70 | * @sourceFile Pointer to source FILE. 71 | * @destFile Pointer to destination FILE. 72 | */ 73 | int fcpy(FILE * sourceFile, FILE * destFile) 74 | { 75 | int count = 0; 76 | char ch; 77 | 78 | /* 79 | * Copy file contents character by character. 80 | */ 81 | ch = fgetc(sourceFile); 82 | while (ch != EOF) 83 | { 84 | /* Write to destination file */ 85 | fputc(ch, destFile); 86 | 87 | /* Read next character from source file */ 88 | ch = fgetc(sourceFile); 89 | 90 | /* Increment character copied count */ 91 | count++; 92 | } 93 | 94 | return count; 95 | } -------------------------------------------------------------------------------- /src/file/create-and-write-contents-to-file.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @author Pankaj Prakash 3 | * @website http://codeforwin.org/2018/01/c-program-create-file-write-contents.html 4 | * @description C program to create and write contents to a file. 5 | * ------------------------------------------------------------------------------------- */ 6 | 7 | #include 8 | #include 9 | 10 | #define DATA_SIZE 1000 11 | 12 | int main() 13 | { 14 | /* Variable to store user content */ 15 | char data[DATA_SIZE]; 16 | 17 | /* File pointer to hold reference to our file */ 18 | FILE * fPtr; 19 | 20 | 21 | /* 22 | * Open file in w (write) mode. 23 | * "data/file1.txt" is complete path to create file 24 | */ 25 | fPtr = fopen("data/file1.txt", "w"); 26 | 27 | 28 | /* fopen() return NULL if last operation was unsuccessful */ 29 | if(fPtr == NULL) 30 | { 31 | /* File not created hence exit */ 32 | printf("Unable to create file.\n"); 33 | exit(EXIT_SUCCESS); 34 | } 35 | 36 | 37 | /* Input contents from user to store in file */ 38 | printf("Enter contents to store in file : \n"); 39 | fgets(data, DATA_SIZE, stdin); 40 | 41 | 42 | /* Write contents to file */ 43 | fputs(data, fPtr); 44 | 45 | 46 | /* Close file to save contents */ 47 | fclose(fPtr); 48 | 49 | 50 | /* Success message */ 51 | printf("File created and saved successfully. :) \n"); 52 | 53 | 54 | return 0; 55 | } -------------------------------------------------------------------------------- /src/file/file-programming-example-list.md: -------------------------------------------------------------------------------- 1 |

List of file programming exercises

2 | 3 |
    4 |
  1. C program to create a file and display its content.
    2. 5 |
  2. C program to read contents of a given file.
    3. 6 |
  3. C program to read a file line by line.
    4. 7 |
  4. C program to create a binary file and read its content.
    5. 8 |
  5. C program to read file contents from specific position using fseek.
    6. 9 |
  6. C program to read numbers from a file and write even, odd and prime numbers in separate files.
    7. 10 |
  7. C program to delete all blank lines in a file.
    8. 11 |
    12 |
  8. C program to create, read, edit and close a file.
    9. 13 |
  9. C program to append data into a file.
    10. 14 |
  10. C program to compare two files character by character.
    11. 15 |
  11. C program to compare two binary files.
    12. 16 |
  12. C program to copy file.
    13. 17 |
  13. C program to concatenate two files.
    14. 18 |
  14. C program to merge two files.
    15. 19 |
    20 |
  15. C program to count number of lines in a file.
    16. 21 |
  16. C program to print given number of lines of a file (like head command in Linux)..
    17. 22 |
  17. C program to print contents in reverse order of a file (just like TAC command in Linux)..
    18. 23 |
  18. C program to check end of file.
    19. 24 |
    25 |
  19. C program to delete given word in a file.
    20. 26 |
  20. C program to replace a word in a file.
    21. 27 |
  21. C program to merge alternate lines from two files.
    22. 28 |
  22. C program to remove numbers in a file.
    23. 29 |
  23. C program to delete specific line from a file.
    24. 30 |
  24. C program to replace specific line in a file.
    25. 31 |
  25. C program to take input from a file.
    26. 32 |
  26. C program to delete a record from a file.
    27. 33 |
  27. C program to find the number of character, words and lines in a file.
    28. 34 |
  28. C program to print the words in a file starting with the given character.
    29. 35 |
  29. C program to sort characters in each words of a file.
    30. 36 |
  30. C program to convert text file to binary.
    31. 37 |
  31. C program to split a file to multiple files.
    32. 38 |
    39 |
  32. C program to print the source code of itself as output.
    33. 40 |
  33. C program to convert the contents in a file from lowercase to uppercase and vice versa.
    34. 41 |
    42 |
  34. C program to create a file with input content.
    35. 43 |
  35. C program to eliminate comments from a file.
    36. 44 |
  36. C program to replace articles with space in a text file.
    37. 45 |
    46 |
    47 |
  37. C program to check whether a file exists or not.
    38. 48 |
  38. C program to check whether a directory exists or not.
    39. 49 |
  39. C program to copy a file from one location to another.
    40. 50 |
  40. C program to rename or move a file to different location.
    41. 51 |
  41. C program to delete a file or directory revursively.
    42. 52 |
  42. C program to list all files in a directory recursively.
    43. 53 |
    54 |
  43. C Program to Print Environment Variables .
    44. 55 |
  44. C program to find the file type, permission, size and last modification date of the given file.
    45. 56 |
  45. C program to encrypt and decrypt contents of a file.
    46. 57 |
    58 |
  46. C Program to Create Employee Record and Update it .
    47. 59 |
60 | -------------------------------------------------------------------------------- /src/file/read-from-file-using-fgetc.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @author Pankaj Prakash 3 | * @website http://codeforwin.org/2018/01/c-program-read-and-display-file-contents.html 4 | * @description C program to read and display file contents character by character 5 | * using fgetc() 6 | * ----------------------------------------------------------------------------------------- */ 7 | 8 | #include 9 | #include 10 | 11 | 12 | int main() 13 | { 14 | /* File pointer to hold reference to our file */ 15 | FILE * fPtr; 16 | 17 | char ch; 18 | 19 | 20 | /* 21 | * Open file in r (read) mode. 22 | * "data/file1.txt" is complete file path to read 23 | */ 24 | fPtr = fopen("data/file1.txt", "r"); 25 | 26 | 27 | /* fopen() return NULL if last operation was unsuccessful */ 28 | if(fPtr == NULL) 29 | { 30 | /* Unable to open file hence exit */ 31 | printf("Unable to open file.\n"); 32 | printf("Please check whether file exists and you have read privilege.\n"); 33 | exit(EXIT_SUCCESS); 34 | } 35 | 36 | 37 | /* File open success message */ 38 | printf("File opened successfully. Reading file contents character by character. \n\n"); 39 | 40 | do 41 | { 42 | /* Read single character from file */ 43 | ch = fgetc(fPtr); 44 | 45 | /* Print character read on cosole*/ 46 | putchar(ch); 47 | 48 | } while(ch != EOF); /* Repeat this if last read character is not EOF */ 49 | 50 | 51 | /* Done with this file, close file to release resource */ 52 | fclose(fPtr); 53 | 54 | 55 | return 0; 56 | } -------------------------------------------------------------------------------- /src/file/read-from-file-using-fgets.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @author Pankaj Prakash 3 | * @website http://codeforwin.org/2018/01/c-program-read-and-display-file-contents.html 4 | * @description C program to read and display file contents line by line using fgets() 5 | * ----------------------------------------------------------------------------------------- */ 6 | 7 | #include 8 | #include 9 | #include 10 | 11 | #define BUFFER_SIZE 1000 12 | 13 | 14 | int main() 15 | { 16 | /* File pointer to hold reference to our file */ 17 | FILE * fPtr; 18 | 19 | char buffer[BUFFER_SIZE]; 20 | int totalRead = 0; 21 | 22 | 23 | /* 24 | * Open file in r (read) mode. 25 | * "data/file2.txt" is complete file path to read 26 | */ 27 | fPtr = fopen("data/file2.txt", "r"); 28 | 29 | 30 | /* fopen() return NULL if last operation was unsuccessful */ 31 | if(fPtr == NULL) 32 | { 33 | /* Unable to open file hence exit */ 34 | printf("Unable to open file.\n"); 35 | printf("Please check whether file exists and you have read privilege.\n"); 36 | exit(EXIT_SUCCESS); 37 | } 38 | 39 | 40 | /* File open success message */ 41 | printf("File opened successfully. Reading file contents line by line. \n\n"); 42 | 43 | 44 | /* Repeat this until read line is not NULL */ 45 | while(fgets(buffer, BUFFER_SIZE, fPtr) != NULL) 46 | { 47 | /* Total character read count */ 48 | totalRead = strlen(buffer); 49 | 50 | 51 | /* 52 | * Trim new line character from last if exists. 53 | */ 54 | buffer[totalRead - 1] = buffer[totalRead - 1] == '\n' 55 | ? '\0' 56 | : buffer[totalRead - 1]; 57 | 58 | 59 | /* Print line read on cosole*/ 60 | printf("%s\n", buffer); 61 | 62 | } 63 | 64 | 65 | /* Done with this file, close file to release resource */ 66 | fclose(fPtr); 67 | 68 | 69 | return 0; 70 | } -------------------------------------------------------------------------------- /src/file/read-numbers-write-even-odd-prime-to-separate-file.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @author Pankaj Prakash 3 | * @website http://codeforwin.org/2018/01/c-program-write-even-odd-prime-numbers-separate-file.html 4 | * @description C program to input numbers from file and write even, odd and prime 5 | * numbers to separate file. 6 | * ----------------------------------------------------------------------------------------- */ 7 | 8 | #include 9 | #include 10 | 11 | 12 | /* Function declarations */ 13 | int isEven(const int NUM); 14 | int isPrime(const int NUM); 15 | 16 | 17 | int main() 18 | { 19 | /* File pointer to hold reference to different files */ 20 | FILE * fPtrIn, 21 | * fPtrEven, 22 | * fPtrOdd, 23 | * fPtrPrime; 24 | 25 | 26 | int num, success; 27 | 28 | /* 29 | * Open all files to perform read/write. 30 | */ 31 | fPtrIn = fopen("data/numbers.txt", "r"); 32 | fPtrEven = fopen("data/even-numbers.txt" , "w"); 33 | fPtrOdd = fopen("data/odd-numbers.txt" , "w"); 34 | fPtrPrime= fopen("data/prime-numbers.txt", "w"); 35 | 36 | 37 | /* fopen() return NULL if unable to open file in given mode. */ 38 | if(fPtrIn == NULL || fPtrEven == NULL || fPtrOdd == NULL || fPtrPrime == NULL) 39 | { 40 | /* Unable to open file hence exit */ 41 | printf("Unable to open file.\n"); 42 | printf("Please check whether file exists and you have read privilege.\n"); 43 | exit(EXIT_SUCCESS); 44 | } 45 | 46 | 47 | /* File open success message */ 48 | printf("File opened successfully. Reading integers from file. \n\n"); 49 | 50 | 51 | do 52 | { 53 | // Read an integer and store read status in success. 54 | success = fscanf(fPtrIn, "%d", &num); 55 | 56 | /* 57 | * Write prime, even and odd numbers to different files. 58 | */ 59 | if (isPrime(num)) 60 | fprintf(fPtrPrime, "%d\n", num); 61 | else if (isEven(num)) 62 | fprintf(fPtrEven, "%d\n", num); 63 | else 64 | fprintf(fPtrOdd, "%d\n", num); 65 | 66 | } while(success != -1); 67 | 68 | 69 | /* Done with all files, hence close all. */ 70 | fclose(fPtrIn); 71 | fclose(fPtrEven); 72 | fclose(fPtrOdd); 73 | fclose(fPtrPrime); 74 | 75 | printf("Data written to files successfully."); 76 | 77 | 78 | return 0; 79 | } 80 | 81 | 82 | /** 83 | * Check whether a given number is even or not. The function 84 | * return 1 if given number is odd, otherwise return 0. 85 | */ 86 | int isEven(const int NUM) 87 | { 88 | return !(NUM & 1); 89 | } 90 | 91 | 92 | /** 93 | * Check whether a number is prime or not. 94 | * Returns 1 if the number is prime otherwise 0. 95 | */ 96 | int isPrime(const int NUM) 97 | { 98 | int i; 99 | 100 | // Only positive integers are prime 101 | if (NUM < 0) 102 | return 0; 103 | 104 | for ( i=2; i<=NUM/2; i++ ) 105 | { 106 | /* 107 | * If the number is divisible by any number 108 | * other than 1 and self then it is not prime 109 | */ 110 | if (NUM % i == 0) 111 | { 112 | return 0; 113 | } 114 | } 115 | 116 | return 1; 117 | } -------------------------------------------------------------------------------- /src/stdlib/atof.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @author Pankaj Prakash 3 | * @website http://codeforwin.org/2018/01/convert-string-double-using-atof-c.html 4 | * @description C program to convert string to double using atof() library function. 5 | * 6 | * Syntax - double atof (const char * str); 7 | * ------------------------------------------------------------------------------------- */ 8 | 9 | #include 10 | #include // Used for atof() 11 | 12 | 13 | int main() 14 | { 15 | char number[30]; 16 | double decimalNumber; 17 | 18 | 19 | /* Input string representation of floating pointer number from user. */ 20 | printf("Enter any number: "); 21 | fgets(number, 30, stdin); 22 | 23 | 24 | /* Convert string representation of number to double */ 25 | decimalNumber = atof(number); 26 | 27 | 28 | /* Use %f, %lf, %llf to print floating point number */ 29 | printf("Converted floating point number = %lf\n", decimalNumber); 30 | 31 | 32 | return 0; 33 | } -------------------------------------------------------------------------------- /src/stdlib/atoi.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @author Pankaj Prakash 3 | * @website http://codeforwin.org/2018/01/c-program-convert-string-integer-using-atoi-function.html 4 | * @description C program to convert string to integer using atoi() library function. 5 | * 6 | * Syntax - int atoi (const char * str); 7 | * ------------------------------------------------------------------------------------- */ 8 | 9 | #include 10 | #include // Used for atoi() 11 | 12 | 13 | int main() 14 | { 15 | char number[30]; 16 | int num; 17 | 18 | 19 | /* Input string representation of integer from user. */ 20 | printf("Enter any integer: "); 21 | fgets(number, 30, stdin); 22 | 23 | 24 | /* Convert string representation of number to integer */ 25 | num = atoi(number); 26 | 27 | 28 | /* Print converted integer */ 29 | printf("Converted integer = %d\n", num); 30 | 31 | 32 | return 0; 33 | } -------------------------------------------------------------------------------- /src/stdlib/atol.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @author Pankaj Prakash 3 | * @website http://codeforwin.org/2018/01/convert-string-to-long-using-atol-function-c.html 4 | * @description C program to convert string to long using atol() library function. 5 | * 6 | * Syntax - long int atol (const char * str); 7 | * ------------------------------------------------------------------------------------- */ 8 | 9 | #include 10 | #include // Used for atol() 11 | 12 | 13 | int main() 14 | { 15 | char number[30]; 16 | long bigNum; 17 | 18 | 19 | /* Input string representation of integer from user. */ 20 | printf("Enter any integer: "); 21 | fgets(number, 30, stdin); 22 | 23 | 24 | /* Convert string representation of number to integer */ 25 | bigNum = atol(number); 26 | 27 | 28 | /* Use %d, %i, %l, %ld, %li to print long type */ 29 | printf("Converted long int = %ld\n", bigNum); 30 | 31 | 32 | return 0; 33 | } -------------------------------------------------------------------------------- /src/stdlib/atoll.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @author Pankaj Prakash 3 | * @website http://codeforwin.org/2018/01/convert-string-to-long-long-using-atoll-c.html 4 | * @description C program to convert string to long long using atoll() library function. 5 | * 6 | * Syntax - long long int atoll(const char* str); 7 | * ------------------------------------------------------------------------------------- */ 8 | 9 | #include 10 | #include // Used for atoll() 11 | 12 | 13 | int main() 14 | { 15 | char number[30]; 16 | long long int bigNum; 17 | 18 | 19 | /* Input string representation of integer from user. */ 20 | printf("Enter any integer: "); 21 | fgets(number, 30, stdin); 22 | 23 | 24 | /* Convert string representation of number to integer */ 25 | bigNum = atoll(number); 26 | 27 | 28 | /* Use %lld or %lli to print long long type */ 29 | printf("Converted long long int = %lld\n", bigNum); 30 | 31 | 32 | return 0; 33 | } -------------------------------------------------------------------------------- /src/stdlib/strtol.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @author Pankaj Prakash 3 | * @website http://codeforwin.org/2018/01/convert-string-to-long-using-strtol-c.html 4 | * @description C program to convert string to long using strtol() library function. 5 | * 6 | * Syntax - long strtol (const char * str); 7 | * ------------------------------------------------------------------------------------- */ 8 | 9 | #include 10 | #include // Used for strtol() 11 | 12 | 13 | int main() 14 | { 15 | char number[30]; 16 | char* endPtr; 17 | 18 | long bigNumber; 19 | int base; 20 | 21 | 22 | /* Input string representation of number from user. */ 23 | printf("Enter any number: "); 24 | fgets(number, 30, stdin); 25 | 26 | 27 | printf("Enter base: "); 28 | scanf("%d", &base); 29 | 30 | 31 | /* Convert string representation of number to long */ 32 | bigNumber = strtol(number, &endPtr, base); 33 | 34 | 35 | /* endPtr points to NULL for failed conversions */ 36 | if(*endPtr) 37 | printf("Unable to convert '%s' to base %d.", number, base); 38 | else 39 | printf("Converted long = %ld\n", bigNumber); 40 | 41 | 42 | return 0; 43 | } -------------------------------------------------------------------------------- /src/stdlib/strtoll.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @author Pankaj Prakash 3 | * @website http://codeforwin.org/2018/01/convert-string-to-long-long-using-strtoll-c.html 4 | * @description C program to convert string to long long int using strtoll() 5 | * library function. 6 | * 7 | * Syntax - long long int strtoll(const char* str, char** endPtr, int base); 8 | * ------------------------------------------------------------------------------------- */ 9 | 10 | #include 11 | #include // Used for strtoll() 12 | 13 | 14 | int main() 15 | { 16 | char number[30]; 17 | char* endPtr; 18 | 19 | long long int bigNumber; 20 | int base; 21 | 22 | 23 | /* Input string representation of number from user. */ 24 | printf("Enter any number: "); 25 | fgets(number, 30, stdin); 26 | 27 | 28 | printf("Enter base: "); 29 | scanf("%d", &base); 30 | 31 | 32 | /* Convert string representation of number to long long */ 33 | bigNumber = strtoll(number, &endPtr, base); 34 | 35 | 36 | /* endPtr points to NULL for failed conversions */ 37 | if(*endPtr) 38 | printf("Unable to convert '%s' to base %d.", number, base); 39 | else 40 | printf("Converted long long int = %lld\n", bigNumber); 41 | 42 | 43 | return 0; 44 | } -------------------------------------------------------------------------------- /src/stdlib/strtoul.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @author Pankaj Prakash 3 | * @website http://codeforwin.org/2018/01/convert-string-unsigned-long-using-strtoul-c 4 | * @description C program to convert string to unsigned long int using strtoul() 5 | * library function. 6 | * 7 | * Syntax - unsigned long int strtoul(const char* str, char** endPtr, int base); 8 | * ------------------------------------------------------------------------------------- */ 9 | 10 | #include 11 | #include // Used for strtoul() 12 | 13 | 14 | int main() 15 | { 16 | char number[30]; 17 | char* endPtr; 18 | 19 | unsigned long int bigNumber; 20 | int base; 21 | 22 | 23 | /* Input string representation of number from user. */ 24 | printf("Enter any number: "); 25 | fgets(number, 30, stdin); 26 | 27 | 28 | printf("Enter base: "); 29 | scanf("%d", &base); 30 | 31 | 32 | /* Convert string representation of number to unsigned long */ 33 | bigNumber = strtoul(number, &endPtr, base); 34 | 35 | 36 | /* endPtr points to NULL for failed conversions */ 37 | if(*endPtr) 38 | printf("Unable to convert '%s' to base %d.", number, base); 39 | else 40 | printf("Converted unsigned long int = %lu\n", bigNumber); 41 | 42 | 43 | return 0; 44 | } -------------------------------------------------------------------------------- /src/stdlib/strtoull.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @author Pankaj Prakash 3 | * @website http://codeforwin.org/2018/01/convert-string-to-unsigned-long-long-using-strtoull-c.html 4 | * @description C program to convert string to unsigned long long int using strtoull() 5 | * library function. 6 | * 7 | * Syntax - unsigned long long int strtoll(const char* str, char** endPtr, int base); 8 | * ------------------------------------------------------------------------------------- */ 9 | 10 | #include 11 | #include // Used for strtoull() 12 | 13 | 14 | int main() 15 | { 16 | char number[30]; 17 | char* endPtr; 18 | 19 | unsigned long long int bigNumber; 20 | int base; 21 | 22 | 23 | /* Input string representation of number from user. */ 24 | printf("Enter any number: "); 25 | fgets(number, 30, stdin); 26 | 27 | 28 | /* Input base of input string */ 29 | printf("Enter base: "); 30 | scanf("%d", &base); 31 | 32 | 33 | /* Convert string representation of number to unsigned long long */ 34 | bigNumber = strtoull(number, &endPtr, base); 35 | 36 | 37 | /* endPtr points to NULL for failed conversions */ 38 | if(*endPtr) 39 | printf("Unable to convert '%s' to base %d.", number, base); 40 | else 41 | printf("Converted unsigned long long int = %llu\n", bigNumber); 42 | 43 | 44 | return 0; 45 | } --------------------------------------------------------------------------------