课堂作业4

#include<stdio.h>
int main(void)
{
	int i,n;
	double x,y;
	double fee(double x);

	printf("Enter n:");
	scanf("%d",&n);

	for(i=1;i<=n;i++)
	{
		printf("Enter x:");
		scanf("%Lf",&x);

		if(x<=0)
			printf("输入错误，重新输入");
		else{
			y=fee(x);
		}
		printf("y=%.3f
",y
			);
	}
	return 0;
}
double fee(double x)
{
	double y;
		if(x<=50)
		{
			y=0.53*x;
		}
		else
		{
			y=26.5+0.58*(x-50);
		}
	return y;
}