#include <stdio.h>
#include <math.h> 

// macro = text substitution
#define PI 3.14159265

// parametric macro:
#define SINDEG(ALPHA) (sin(PI/180.0*(ALPHA)))

// other exmaple:
// 2 * sin^2(beta)
#define SIN2DEG(BETA) (1.0 - cos(2.0*PI/180.0*(BETA)))

int main(void) {
  double alpha;
  for (alpha=0; alpha<361; alpha+=30) {
    // MACRO = TEXT SUBSTITUTION:
    printf("%5.1lf\t%8.4lf\t%8.4lf\n", alpha, SINDEG(alpha+30.0), 0.5*SIN2DEG(alpha+30.0));
  }
  return 0;
}