#include<stdio.h>
int main(void)
{
int i,n;
double x,y;
printf("Enter n:");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
printf("输入 x:");
scanf("%Lf",&x);
if(x<=0)
{
printf("输入错误,重新输入");
}
else if(x<=50)
{
y=0.53*x;
}
else
{
y=26.5+0.58*(x-50);
}
printf("y=f(%f)=%.2f
",x,y);
}
return 0;
}