题解 | #网购#

#include <stdio.h>
int main()
{
    double price;
    int mouth, day, discount;
    double pay;
    
    scanf("%lf %d %d %d", &price, &mouth, &day, &discount);
    if(mouth == 11 && day == 11)
    {
        pay = price * 0.7;
        if(discount){
            pay -= 50;
        }
         if(pay >= 0)
        {
        printf("%.2lf", pay);
        }else
        {
        printf("0.00");    
        }
    }
    
    if(mouth == 12 && day == 12)
    {
        pay = price * 0.8;
        if(discount)
        {
            pay -= 50;
        }
        
        if(pay >= 0)
        {
        printf("%.2lf", pay);
        }else
        {
        printf("0.00");    
        }
    }
        return 0;
}