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

int
main()
{
	int smp_freq = 8000;
	int smp_cnt, iv, i;
	double freqs[3];
	double len = 1.0;
	double sec, v;

	freqs[0] = 880;
	freqs[1] = freqs[0] * pow(2, 4.0 / 12);
	freqs[2] = freqs[0] * pow(2, 7.0 / 12);

	for(i=0; i<3; i++){
		smp_cnt = 0;
		do{
			sec = (double)smp_cnt / smp_freq;
			v = sin(2 * M_PI * freqs[i] * sec);
			iv = 128 + (int)(v * 127);
			putchar(iv);
			smp_cnt++;
		}while(sec < len);
	}
	
	smp_cnt = 0;
	len = 2;
	do{
		sec = (double)smp_cnt / smp_freq;
		v = 0;
		for(i=0; i<3; i++){
			v += sin(2 * M_PI * freqs[i] * sec);
		}
		v /= 3;
		iv = 128 + (int)(v * 127);
		putchar(iv);
		smp_cnt++;
	}while(sec < len);
	return 0;
}

/* EOF */