├── README.md
└── restaurantBilling.c


/README.md:
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1 | # billing_system


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/restaurantBilling.c:
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  1 | #include<stdio.h>
  2 | #include<string.h>
  3 | #include<stdlib.h>
  4 | 
  5 | struct items{
  6 |     char item[20];
  7 |     float price;
  8 |     int qty;
  9 | };
 10 | 
 11 | struct orders{
 12 |     char customer[50];
 13 |     char date[50];
 14 |     int numOfItems;
 15 |     struct items itm[50];
 16 | };
 17 | //functions to generate biils
 18 | void generateBillHeader(char name[50],char date[30]){
 19 |     printf("\n\n");
 20 |         printf("\t    ADV. Restaurant");
 21 |         printf("\n\t   -----------------");
 22 |         printf("\nDate:%s",date);
 23 |         printf("\nInvoice To: %s",name);
 24 |         printf("\n");
 25 |         printf("---------------------------------------\n");
 26 |         printf("Items\t\t");
 27 |         printf("Qty\t\t");
 28 |         printf("Total\t\t");
 29 |         printf("\n---------------------------------------");
 30 |         printf("\n\n");
 31 | }
 32 | void generateBillBody(char item[30],int qty, float price){
 33 |     printf("%s\t\t",item); 
 34 |         printf("%d\t\t",qty); 
 35 |         printf("%.2f\t\t",qty * price); 
 36 |         printf("\n");
 37 | }
 38 | 
 39 | 
 40 | 
 41 | void generateBillFooter(float total){
 42 |     printf("\n");
 43 |     float dis = 0.1*total;
 44 |     float netTotal=total-dis;
 45 |     float cgst=0.09*netTotal,grandTotal=netTotal + 2*cgst;//netTotal + cgst + sgst
 46 |     printf("---------------------------------------\n");
 47 |     printf("Sub Total\t\t\t%.2f",total);
 48 |     printf("\nDiscount @10%s\t\t\t%.2f","%",dis);
 49 |     printf("\n\t\t\t\t-------");
 50 |     printf("\nNet Total\t\t\t%.2f",netTotal);
 51 |     printf("\nCGST @9%s\t\t\t%.2f","%",cgst);
 52 |     printf("\nSGST @9%s\t\t\t%.2f","%",cgst);
 53 |     printf("\n---------------------------------------");
 54 |     printf("\nGrand Total\t\t\t%.2f",grandTotal);
 55 |     printf("\n---------------------------------------\n");
 56 | }
 57 | int main(){
 58 |     
 59 |     int opt,n;
 60 |     struct orders ord;
 61 |     struct orders order;
 62 |     char saveBill = 'y',contFlag = 'y';
 63 |     char name[50];
 64 |     FILE *fp;
 65 |        //dashboard
 66 |     while(contFlag == 'y'){
 67 |     system("clear");
 68 |     float total = 0;
 69 |     int invoiceFound = 0;
 70 |     printf("\t============ADV. RESTAURANT============");
 71 |     printf("\n\nPlease select your prefered operation");
 72 |     printf("\n\n1.Generate Invoice");
 73 |     printf("\n2.Show all Invoices");
 74 |     printf("\n3.Search Invoice");
 75 |     printf("\n4.Exit");
 76 | 
 77 |     printf("\n\nYour choice:\t");
 78 |     scanf("%d",&opt);
 79 |     fgetc(stdin);
 80 |     switch(opt){
 81 |         case 1:
 82 |         system("clear");
 83 |         printf("\nPlease enter the name of the customer:\t");
 84 |         fgets(ord.customer,50,stdin);
 85 |         ord.customer[strlen(ord.customer)-1] = 0;
 86 |         strcpy(ord.date,__DATE__);
 87 |         printf("\nPlease enter the number of items:\t");
 88 |         scanf("%d",&n);
 89 |         ord.numOfItems = n;
 90 |         for(int i=0;i<n;i++){
 91 |             fgetc(stdin);
 92 |             printf("\n\n");
 93 |             printf("Please enter the item %d:\t",i+1);
 94 |             fgets(ord.itm[i].item,20,stdin);
 95 |             ord.itm[i].item[strlen(ord.itm[i].item)-1]=0;
 96 |             printf("Please enter the quantity:\t");
 97 |             scanf("%d",&ord.itm[i].qty);
 98 |             printf("Please enter the unit price:\t");
 99 |             scanf("%f",&ord.itm[i].price);
100 |             total += ord.itm[i].qty * ord.itm[i].price;
101 |         }
102 | 
103 |         generateBillHeader(ord.customer,ord.date);
104 |         for(int i=0;i<ord.numOfItems;i++){
105 |             generateBillBody(ord.itm[i].item,ord.itm[i].qty,ord.itm[i].price);
106 |         }
107 |         generateBillFooter(total);
108 | 
109 |         printf("\nDo you want to save the invoice [y/n]:\t");
110 |         scanf("%s",&saveBill);
111 | 
112 |         if(saveBill == 'y'){
113 |             fp = fopen("RestaurantBill.dat","a+");
114 |             fwrite(&ord,sizeof(struct orders),1,fp);
115 |             if(fwrite != 0)
116 |             printf("\nSuccessfully saved");
117 |             else 
118 |             printf("\nError saving");
119 |             fclose(fp);
120 |         }
121 |         break;
122 | 
123 |         case 2:
124 |         system("clear");
125 |         fp = fopen("RestaurantBill.dat","r");
126 |         printf("\n  *****Your Previous Invoices*****\n");
127 |         while(fread(&order,sizeof(struct orders),1,fp)){
128 |             float tot = 0;
129 |             generateBillHeader(order.customer,order.date);
130 |             for(int i=0;i<order.numOfItems;i++){
131 |                 generateBillBody(order.itm[i].item,order.itm[i].qty,order.itm[i].price);
132 |                 tot+=order.itm[i].qty * order.itm[i].price;
133 |             }
134 |             generateBillFooter(tot);
135 |         }
136 |         fclose(fp);
137 |         break;
138 | 
139 |         case 3:
140 |         printf("Enter the name of the customer:\t");
141 |         //fgetc(stdin);
142 |         fgets(name,50,stdin);
143 |         name[strlen(name)-1] = 0;
144 |         system("clear");
145 |         fp = fopen("RestaurantBill.dat","r");
146 |         printf("\t*****Invoice of %s*****",name);
147 |         while(fread(&order,sizeof(struct orders),1,fp)){
148 |             float tot = 0;
149 |             if(!strcmp(order.customer,name)){
150 |             generateBillHeader(order.customer,order.date);
151 |             for(int i=0;i<order.numOfItems;i++){
152 |                 generateBillBody(order.itm[i].item,order.itm[i].qty,order.itm[i].price);
153 |                 tot+=order.itm[i].qty * order.itm[i].price;
154 |             }
155 |             generateBillFooter(tot);
156 |             invoiceFound = 1;
157 |             }
158 |         
159 |         }
160 |         if(!invoiceFound){
161 |             printf("Sorry the invoice for %s doesnot exists",name);
162 |         }
163 |         fclose(fp);
164 |         break;
165 | 
166 |     case 4:
167 |     printf("\n\t\t Bye Bye :)\n\n");
168 |     exit(0);
169 |     break;
170 | 
171 |     default:
172 |     printf("Sorry invalid option");
173 |     break;
174 |     }
175 |     printf("\nDo you want to perform another operation?[y/n]:\t");
176 |     scanf("%s",&contFlag);
177 |     }
178 |     printf("\n\t\t Bye Bye :)\n\n");
179 |     printf("\n\n");
180 | 
181 |     return 0;
182 | }


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