/* Program to compute circumference and area of a circle, given its radius */

#include <stdio.h>

#define pi 3.1415926535

void compute_circle (double circle_radius, 
                     double circle_circum, 
                     double circle_area)
{
  circle_circum = 2.0 * pi * circle_radius;
  circle_area = pi * circle_radius * circle_radius;

  printf ("%lf // %lf \n", circle_circum, circle_area);

  printf ("addresses: radius: %u, circum: %u, area: %u\n",
	  (unsigned int) &circle_radius, 
          (unsigned int) &circle_circum, 
          (unsigned int) &circle_area);
}

int main ()
{
  printf ("program to compute circumference and area of a circle\n");
  double radius, circumference, area;

  /* specify radius */
  radius = 3.0;
  printf ("   a circle with radius %lf\n", radius);

  /* use a procedure to compute circumference and area */
  compute_circle (radius, circumference, area);

  /* report results */
  printf ("   has circumference %lf and area %lf",
	  circumference, area);

  printf ("addresses:  radius: %u, circum: %u, area: %u\n",
	  (unsigned int) &radius, 
          (unsigned int) &circumference, 
          (unsigned int) &area);

  return 0;
}