program3_02.c

C语言入门经典一书的所有代码。书上面的所有代码均在此。希望大家喜欢

/* Program 3.2 Using if statements to decide on a discount */
#include <stdio.h>

int main(void)
{
  const double unit_price = 3.50;           /* Unit price in dollars */
  int quantity = 0;
  printf("Enter the number that you want to buy:"); /* Prompt message */
  scanf(" %d", &quantity);                  /* Read the input        */

  /* Test for order quantity qualifying for a discount */
  if( quantity>10)                          /* 5% discount           */
    printf("The price for %d is $%.2f\n", quantity, quantity*unit_price*0.95);
  else                                      /* No discount           */
    printf("The price for %d is $%.2f\n", quantity, quantity*unit_price);
  return 0;
}