Question

Create a program in C, for a store, that asks the user to select one of the options below and you must use function pointers to call the user’s choice of function for options 1 through 7

1. Determine and print total revenue. This is calculated as the sum of retail price * retail quantity for all items.

2. Determine and print total sale cost. This is calculated as the sum of sale price * sale quantity for all items

3. Determine and print the current investment. This is calculated as the sum of sale price * (sale quantity – retail quantity).

4. Determine and print profit. This is total revenue (#1) minus total sale cost (#2) plus cost of current investment (#3).

5. Determine and print total number of sales. This is calculated as the sum of the retail quantity.

6. Determine and print average profit per sale. This is profit (#4) divided by total number of sales (#5).

7. Print items in stock. This function should print each item into a list.

Answer 1

#include<stdio.h>
#include<conio.h>
void calling(int ch)
{
float rp,rq,total_revenue,sp,sq,total_sale_cost,current_inv;
float tr,tsc,profit,srq,pr,tns,average_pr;
switch(ch)
   {
   case 1:
       {
       printf("\nenter the sum of retail price: ");
       scanf("%f",&rp);
       printf("\nenter the retail quantity: ");
       scanf("%f",&rq);
       total_revenue=rp*rq;
       printf("\nThe total revenue is %f",total_revenue);

       break;
       }
   case 2:
       {
       printf("enter the sum of sale price: ");
       scanf("%f",&sp);
       printf("enter the sale quantity for all items: ");
       scanf("%f",&sq);
       total_sale_cost=sp*sq;
       printf("The total sale cost is %f",total_sale_cost);
       break;
       }
   case 3:
       {
       printf("enter the sum of sale price: ");
       scanf("%f",&sp);
       printf("enter the sale quantity: ");
       scanf("%f",&sq);
       printf("enter the retail quantity: ");
       scanf("%f",&rq);
       current_inv=sp*(sq-rq);
       printf("\ntotal current_investment is %f",current_inv);

       break;
       }
   case 4:
       {
       printf("enter total revenue: ");
       scanf("%d",&tr);
       printf("enter the total sale cost: ");
       scanf("%d",&tsc);
       printf("enter the cost of current_investment: ");
       scanf("%d",&current_inv);
       profit=tr-tsc+current_inv;
       printf("The profit is %d ",profit);

       break;
       }
   case 5:
       {
       printf("enter the total sum of retail quantity: ");
       scanf("%f",&srq);
       printf("\ntotal number of sales is %f",srq);

       break;
       }
   case 6:
       {
       printf("enter profit: ");
       scanf("%d",&pr);
       printf("enter total number of sales: ");
       scanf("%d",tns);
       average_pr=pr/tns;
       printf("the average profit is %d ",average_pr);

       break;
       }
   case 7:
       {
       printf("1.guitar 200 piece ");
       printf("2.laptop 100 piece ");
       printf("3.mobile 3000 piece ");
       break;
       }
   default:
   printf("wrong choice entered");
   }
}
void main()
{
int a;
void (*call_ptr)(int)=&calling;
clrscr();
printf("enter your choic from 1 to 7: ");
scanf("%d",&a);
(*call_ptr)(a);
getch();
}

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