# include <stdio.h>

# define PI 3.1415926535

//
//  Program 13.2, Stephen Kochan, Programming in C.
//
int main ( void );
double area ( double r );
double circumference ( double r );
double volume ( double r );


int main ( void )
{
  double r;

  r = 1.0;

  printf ( "R = %.4f, area = %.4f, circumference = %.4f, volume = %.4f\n",
    r, area ( r ), circumference ( r ), volume ( r ) );

  r = 4.98;

  printf ( "R = %.4f, area = %.4f, circumference = %.4f, volume = %.4f\n",
    r, area ( r ), circumference ( r ), volume ( r ) );

  return 0;
}

double area ( double r )
{
  double value;

  value = PI * r * r;

  return value;
}


double circumference ( double r )
{
  double value;

  value = 2.0 * PI * r;

  return value;
}


double volume ( double r )
{
  double value;

  value = ( 4.0 / 3.0 ) * PI * r * r * r;

  return value;
}