Ex5.1

#include <stdio.h>
#define IPOD 148
#define IPAD 288
#define TOTAL 1020

int main () {
  int ipod, ipad;
  float total, discount;
  printf("%*s%s%*s\n", 10, "", "Welcome to Topcare supermarket", 10, "");
  printf("Please enter the numbers of products below that you would buy:\n");
  printf("- Ipod: ");
  scanf("%d", &ipod);
  printf("- Ipad: ");
  scanf("%d", &ipad);
  printf("\nTOPCARE SUPERMARKET - BILL\n");
  printf("---------------------------\n");
  printf("%-*s%-*s%-*s\n", 5, "Qty", 15, "Product", 7, "Total");
  printf("---------------------------\n");
  printf("%-*d%-*s$%-*d\n", 5, ipod, 15, "Ipod", 6, ipod*IPOD);
  printf("%-*d%-*s$%-*d\n\n", 5, ipad, 15, "Ipad", 6, ipad*IPAD);
  total = ipod*IPOD + ipad*IPAD;
  printf("Net: $%.2f\n\n", total);
  printf("Your discount is %.0f%%\n", (discount = 10 * ((total > TOTAL) || ((ipod >= 3) && (ipad > 2)))));
  printf("You pay $%.2f (-$%.2f) = $%.2f\n", total, total*discount/100, total*(1+discount/100));
  return 0;
}