实验二

#include<stdio.h>
int main(void)
{
    int i,n,r,h;
    double v;
    printf("the enter n:");
    scanf("%d",&n);
    for(i=1;i<=n;i++){
    printf("the enter r:");
    scanf("%d",&r);
    printf("the enter h:");
    scanf("%d",&h);
        if(r<=0||r<=0)
        printf("The Enter is wrong");
        else
        v=3.14*r*r*h;
    printf("v=%.2f\n",v);
        }
    return 0;
}