#include <stdio.h>

#define RADIUS  15.0              /* This value is in centimeters */

main()
{
  /* Variable declarations */
  const double pi = 3.14159;     
  double area;
  double circumference;
  
  /* Calculations */  
  area = pi * RADIUS * RADIUS;      /* area of a circle = pi*r^2  */
  
  circumference = 2 * pi * RADIUS;  /* circumference of a         */
                                    /* circle = 2*pi*r            */
  
  /* Output */
  printf("The area of a circle with radius %f cm is %f cm^2\n", 
         RADIUS, area);
  
  printf("The circumference of a circle with radius %f cm is %f cm^2\n", 
         RADIUS, circumference);
}