text: /* File : example.c */
  
  #include "example.h"
  #define M_PI 3.14159265358979323846
  
  double Circle::area(void) {
    return M_PI*radius*radius;
  }
  
  double Circle::perimeter(void) {
    return 2*M_PI*radius;
  }
  
  double Circle::getPi(void) {
    return M_PI;
  }
  
  