实验三-2未完成

#include<stdio.h>
#define PI 3.14
int main(void)
{
    int n;
    double r,s,h,v;
    printf("Enter n:");
    printf("Enter h:");
    printf("Enter r:");
    scanf("%d",&n);
    scanf("%d",&h);
    scanf("%d",&r);
    v=n*PI*r*r*h;