题解 | #网购#

#include <stdio.h>

int main() 
{
   float price = 0;
   int month = 0;
   int data = 0;
   int c = 0;
   scanf("%f %d %d %d", &price, &month, &data, &c);
   //双十一
   if(month==11 && data==11)
   {
        price = price*0.7-c*50;
   }
   //双十二
   else
   {
        price = price*0.8-c*50;
   }
   if(price<0)
   {
    printf("0.00\n");
   }
   else
   {
        printf("%.2f\n", price);
   }

    return 0;
}