题解 | #网购#

#include <stdio.h>

int main() {
    float val,month,date,yhj,money;
    scanf("%f%f%f%f",&val,&month,&date,&yhj);
    if(month==11&&date==11)
    {
        if(yhj==1)
            money=val*0.7-50;
        else
            money=val*0.7;
    }   
    else if(month==12&&date==12)
    {
        if(yhj==1)
           money=val*0.8-50;
        else
           money=val*0.8;
    }
    else
        money=val;
        if(money<0)
        money=0;
        printf("%.2f",money);
    return 0;
}