实验4

#include<stdio.h>
int main(void)
{double r,h,v,n;printf("Enter r,h and n ");scanf("%lf%lf%lf",&r,&h,&n);if(r<=0||h<=0){printf("输入错误，重新输入");}else{v=cylinder(r,h,n);printf("v=%.3f\n",v);}return 0;
}
double cylinder(double r,double h,double n)
{double result;result=3.1415926*r*r*h*n;return result;
}