题解 | 网购

#include <stdio.h>

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