题解 | #网购#

#include<stdio.h>
int main()
{
    float price,discount_price;
    int month,date,flag;
    scanf("%f %d %d %d",&price,&month,&date,&flag);
    if(month==11&&date==11){
        discount_price=0.7*price;
        if(flag==1){
            discount_price=discount_price-50;
            if(discount_price<=0){
                discount_price=0;
                printf("%.2f",discount_price);
            }else{
                printf("%.2f",discount_price);
            }
        }else if(flag==0){
            printf("%.2f",discount_price);
        }
    }else if(month==12&&date==12){
        discount_price=0.8*price;
        if(flag==1){
            discount_price=discount_price-50;
            if(discount_price<=0){
                discount_price=0;
                printf("%.2f",discount_price);
            }else{
                printf("%.2f",discount_price);
            }
        }else if(flag==0){
            printf("%.2f",discount_price);
        }
    }else{
        printf("%.2f",price);
    }
    
    return 0;
}