Question

C Language Program. PLEASE USE DYNAMIC MEMORY AND FOLLOW DIRECTIONS GIVEN. USE FUNCTIONS GIVEN ALSO. Thank you. NO FFLUSH.

Problem 5 (40 points)-Write a program Submit orders.c (Note: you wil be dynamically allocating memory for this problem. The second argument on the command line will let you know how much memory you will be allocating. O points if you do not dynamically allocate) Chef Bartolomeo owns a very busy Italian restaurant. He has recently started accepting orders online and every morning he puts all orders into a text file. He has asked you to create a program with the following functionality: 1) Upon opening the program, the program should greet him with the phrase "Buongiorno Chef Bartolomeo! The program should then read each order given in the text file into a struct. The information given in the file is in the following format: Allegra Rossi,m,5,11.99,2 where Allegra Rossi is name, m stands for payment in cash (and c would mean payment with a credit card), 5 is the total number of items ordered, 11.99 is the total amount spent by the customer for the order, and 2 means the order has not yet been fulfilled (1 would mean the order has been fulfilled). 2) The program should allow him to print out the names on orders that have been fulfilled or orders that have not been fulfilled. 3) The program should be able to pick the next order to fulfill. The next order is determined by the order that has the highest price. The program should then ask if he wants to fulfill this order or not. If all orders have been fulfilled, then the program should say so and return to the menu. 4) If Chef Bartolomeo decides to exit the program, all information should be saved exactly as it is into the same file opened. This way, when he decides to open the program again, he can pick up where he left off.

Answer 1

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

struct Order {
   char name[50];
   char paymentType;
   int totalNoOfItems;
   double totalCost;
   int fulfillStatus;
   struct Order *next;
};
typedef struct Order order;

void input_orders(order *o, int size, char *filename) {
   order *orderList = o;
   char c[300], ch;
   int i=0, defaultLineSize = 300;
   FILE *fp;

   strcpy(c,"/home/basant/workspace/HomeworkLib/");
   strcat(c, filename);
   fp = fopen(c, "r");
   if(fp == NULL) {
       printf("Error opening file %s\n", c);
       exit(1);
   }
   memset(c, '\0', 300);

   for(int i=0; i<size; i++) {
       fgets(c, defaultLineSize, fp);

       order *newOrder = orderList;
       int lineIndex = 0;
       char delimiter=',';

       //Reading the name
       while(c[lineIndex] != delimiter) {
           newOrder->name[lineIndex] = c[lineIndex];
           lineIndex++;
       }
       newOrder->name[lineIndex] = '\0';
       lineIndex++;

       //PaymentType
       newOrder->paymentType = c[lineIndex++];
       lineIndex++;

       //No. Of Items
       int totalNoOfItems=0;
       while(c[lineIndex] != delimiter) {
           totalNoOfItems = 10*totalNoOfItems + (c[lineIndex++]-'0');
       }
       newOrder->totalNoOfItems = totalNoOfItems;
       lineIndex++;

       //TotalAmount
       double amount=0;
       while(c[lineIndex] != '.') {
           amount = amount*10 + (c[lineIndex++]-'0');
       }
       lineIndex++;
       int decimalValue=10;
       while(c[lineIndex] != delimiter) {
           amount = amount + (double)(c[lineIndex++]-'0')/decimalValue;
           decimalValue*=10;
       }
       newOrder->totalCost = amount;
       lineIndex++;

       //Fulfill Status
       newOrder->fulfillStatus = c[lineIndex]-'0';

       orderList = orderList->next;
   }
   fclose(fp);
}

void print_out(int status, order *o, int size) {
   order *orderList = o;
   for(int i=0; i<size; i++) {
       if(orderList->fulfillStatus == status) {
           printf("%s\n", orderList->name);
       }
       orderList = orderList->next;
   }
}

int pick_next(order *o, int size) {
   order *orderList = o;
   double maxOrderValue = 0;
   int index = -1;
   for(int i=0; i<size; i++) {
       if(orderList->fulfillStatus == 2) {
           if(orderList->totalCost > maxOrderValue) {
               index = i;
               maxOrderValue = orderList->totalCost;
           }
       }
       orderList = orderList->next;
   }
   return index;
}

void output_file(char *filename, order *o, int size) {
   order *orderList = o;
   FILE *fp;
   char c[300];

   strcpy(c,"/home/basant/workspace/HomeworkLib/");
   strcat(c, filename);
   fp = fopen(c, "w");
   if(fp == NULL) {
       printf("Error opening file %s\n", filename);
       exit(1);
   }

   for(int i=0; i<size; i++) {
       fprintf(fp, "%s,%c,%d,%g,%d\n",
               orderList->name,
               orderList->paymentType,
               orderList->totalNoOfItems,
               orderList->totalCost,
               orderList->fulfillStatus);
       orderList = orderList->next;
   }
   fclose(fp);
}

int main(int argc, char *argv[]) {
   order *orderList;
   char ch, filename[30];

   int size = atoi(argv[1]);
   strcpy(filename, argv[2]);

   //Creating 'size' no. of nodes
   orderList = (order*)malloc(sizeof(order));
   orderList->next = NULL;
   order *head = orderList;
   for(int i=1; i<size; i++) {
       order *newOrder = (order*)malloc(sizeof(order));
       orderList->next = newOrder;
       orderList = orderList->next;
   }
   orderList->next = NULL;
   orderList = head;
   input_orders(orderList, size, filename);

   printf("***Buongiorno Chef Bartolomeo***\n");
   while(1) {
       int input;
       char orderType[20];
       printf("\nWhat to do?\n");
       printf("1. print out orders\n");
       printf("2. pick next order to fulfill\n");
       printf("3. exit\n");
       printf("Your input here: ");
       scanf("%d", &input);

       if(input == 1) {
           printf("Do you want to see all orders to fill or orders already completed? Type fill or completed ");
           scanf("%s",orderType);
           scanf("%c", &ch); //Intentionally placed to flush \n
           if(strcmp(orderType, "fill") == 0) {
               printf("Needed to fill\n");
               print_out(2, orderList, size);
           } else if(strcmp(orderType, "completed") == 0) {
               printf("Already Filled\n");
               print_out(1, orderList, size);
           }
       } else if(input == 2) {
           order *orderToBeFulfilled = NULL;
           int index = pick_next(orderList, size);
           if(index != -1) {
               orderToBeFulfilled = orderList;
               for(int i=0; i<index; i++) {
                   orderToBeFulfilled = orderToBeFulfilled->next;
               }
           }

           if(orderToBeFulfilled == NULL) {
               printf("No orders present to be fulfilled\n");
           } else {
               char ch;
               printf("Next order to fill: %s\n", orderToBeFulfilled->name);
               printf("Go ahead and fulfill this order? y or n ");
               scanf("%c",&ch); //Intentionally placed to flush \n
               scanf("%c",&ch); //Actual reading of input
               if(ch == 'y') {
                   printf("Fulfilled!\n");
                   orderToBeFulfilled->fulfillStatus = 1;
               } else {
                   printf("Not Fulfilled\n");
               }
           }
       } else if(input == 3) {
           printf("Saving Information..Ciao!\n");
           output_file(filename, orderList, size);
           free(orderList);
           break;
       } else {
           printf("Not a valid menu choice\n");
       }
   }
}