#include <stdio.h>
#include <math.h>

int main(int argc, char *argv[])
{
  int ch;
  float radius, volume;

  printf("Please input the radius of ball : ");
  scanf("%f", &radius);
  volume = pow(radius, 3) * 4 / 3;
  printf("The volume of ball is %g", volume);

  while ((ch = getchar()) != 0x20);
  return 0;
}