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

#define BASEFREQ 700
#define TIME 1500

typedef struct note NOTE;

struct note {
  double phi;
  int age;
  double freq;
  } ;

static NOTE notes[2];

static int nint(double d)
{
 if (d < 0) return(d-.5); else return(d+.5);
}

static void write_sample(int s)
{
 if (s < -32767) s = -32767;
 if (s > 32767) s = 32767;
 putchar((s>>8)&0xff);
 putchar(s&0xff);
}

static void init_note(NOTE *n, double freq)
{
 n->phi = 0;
 n->age = 0;
 n->freq = freq;
}

static double note_value(NOTE *n)
{
 n->age ++;
 n->phi += (n->freq*2*M_PI) / 8000;
 if (n->phi >= 2*M_PI) n->phi -= 2*M_PI;
 if (n->age < TIME)
  { return(n->age*sin(n->phi)/TIME);
  }
 else
  { return(((2*TIME)-n->age)*sin(n->phi)/TIME);
  }
}

int main(void);
int main(void)
{
 int i;

 init_note(&notes[0],BASEFREQ);
 init_note(&notes[1],(3*BASEFREQ)/2);
 for (i=0;i<(2*TIME);i++)
  { write_sample(nint( ( note_value(&notes[0]) +
			 note_value(&notes[1]) ) * 3000 ));
  }
 exit(0);
}