题解 | #网购#

#include <stdio.h>
int main()
{
	double price = 0.0;//衣服价格
	int month = 0;
	int day = 0;
	int discount = 0;//判断是否有优惠
	double count = 0.0;//实际花的钱
	scanf("%lf %d %d %d",&price,&month,&day,&discount);
	if (month == 11 && day == 11)
	{
		count = price*0.7 - discount*50;
	}
	else if (month == 12 && day == 12)
	{
		count = price*0.8 - discount*50;
	}
	if (count <= 0)
	{
		count = 0.0;
	}
	printf("%0.2lf", count);
	return 0;
}