题解 | #网购#

#include<stdio.h>
int main()
{
    float money = 0;
    int m = 0;
    int d = 0;
    int flag = 0;
    float cut = 1.0;
   scanf("%f%d%d%d",&money,&m,&d,&flag);
        if(m == 11 && d == 11)
        {
             cut = 0.7;    //折扣
        }
        else if(m == 12 && d == 12)
        {
             cut = 0.8;     //折扣
        }
        money  = money * cut - flag * 50;  //根据flag的输入判断是否需要优惠50
      if(money < 0)        //商家不会倒找钱
      {
         money = 0.0;
      }
    printf("%.2f",money);
    return 0;
}