#include
     
      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\n",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;}