#include<stdio.h>
#define PI 3.1416
float area(float);
float volume(float,float);
void main()
{  float r,h;
   printf("Input r,h:");
   scanf("%f,%f",&r,&h);
   printf("The volume is %.2f\n",volume(r,h));
}
float area(float r)
{ return PI*r*r;
}
float volume(float r,float h)
{ return area(r)*h;
}