计算圆柱体的体积

#include <stdio.h>

#include<cmath>
#define PAI 3.14159
int main()
{
 double r,h,V;
 printf("please enter yuan`s r:");
 scanf("%lf",&r);
 printf("please enter yuan`s h:");
 scanf("%lf",&h);
 V=PAI*r*r*h;
 printf("圆柱体的体积：%lf\n",V);
 return 0;
}