课堂作业2

#include<stdio.h>
int main()
{
    int i,n;
    double r,h,radius,height,volume;
    double cylinder(double r,double h);
    printf("Enter n:");
    scanf("%d",&n);

    for(i=1;i<=n;i++){
        printf("Enter r and h:");
        scanf("%lf%lf",&r,&h);

    if((r<=0)||(h<=0)){
        printf("输入错误，重新输入
");
       }
    else{
        volume=cylinder(r,h);
        printf("Volume=%.3f
",volume);
       }
    }

    return 0;
}

double cylinder(double r,double h)
{
    double result;

    result=3.1415926*r*r*h;

    return result;
}