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;
}