Question

A variety of 15 percent of discount on sales of totaling $300 or more. Write the program by using functions in c programming that request the cost of 3 items and print the amount the coustmer must have to pay.

Answer 1

#include <stdio.h>

double getFinalCost(double cost){
    if(cost >= 300){
        cost = (cost*75)/100;
    }
    return cost;
}

int main(){
   double cost, total = 0;
   
   printf("Enter first item cost: ");
   scanf("%lf",&cost);
   total += cost;
   
   printf("Enter second item cost: ");
   scanf("%lf",&cost);
   total += cost;
   
   printf("Enter third item cost: ");
   scanf("%lf",&cost);
   total += cost;
   
   printf("coustmer must have to pay: %lf\n",getFinalCost(total));
   return 0;
}