题解 | #网购#

#include <stdio.h>

int main() 
{
    double price,last_price;
    int b,c,d;
    scanf("%lf %d %d %d",&price,&b,&c,&d);
    if(b==11){
        if(d==1){
            last_price=price*0.7-50;
            if(last_price<0){
               printf("0.00"); 
            }
            else 
                printf("%.2f",last_price);
        }
        else{
            last_price=price*0.7;
             if(last_price<0){
               printf("0.00"); 
            }
            else
                printf("%.2f",last_price);
        }
    }
    else{
        if(d==1){
            last_price=price*0.8-50;
            if(last_price<0){
               printf("0.00"); 
            }
            else 
                printf("%.2f",last_price);
        }
        else{
            last_price=price*0.8;
             if(last_price<0){
               printf("0.00"); 
            }
            else
                printf("%.2f",last_price);
        }
    }
    return 0;
}