#include <stdio.h>

#define HALF_PI 1.5708
#define BAD_PI  HALF_PI+HALF_PI
#define PI ((HALF_PI)+(HALF_PI))

int main ( int argc, char ** argv ){

  // want 3.14 * 2 = 6.28
  printf("%f\n", BAD_PI*2);
  printf("%f\n", PI*2);
  

}