program3_06.c

来自「[C语言入门经典(第4版)]整本书的源码！值得推荐！全部是最简单的源码！」· C语言 代码 · 共 25 行

/* Program 3.6 Multiple discount levels */
#include <stdio.h>

int main(void)
{
  const double unit_price = 3.50; /* Unit price in dollars     */
  const double discount1 = 0.05;  /* Discount for more than 10 */
  const double discount2 = 0.1;   /* Discount for more than 20 */
  const double discount3 = 0.15;  /* Discount for more than 50 */
  double total_price = 0.0;
  int quantity = 0;

  printf("Enter the number that you want to buy:");
  scanf(" %d", &quantity);

  total_price = quantity*unit_price*(1.0 -
                   (quantity>50 ? discount3 : (
                           quantity>20 ? discount2 : (
                                  quantity>10 ? discount1 : 0.0))));

  printf("The price for %d is $%.2f\n", quantity, total_price);
  return 0;
}