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

#define SAMPLE_RATE 44100
#define DURATION 5
#define FREQUENCY 440
#define VOLUME 0.3f

int main() {
    for (size_t i = 0; i < DURATION * SAMPLE_RATE; ++i) {
        float t = (float)i / SAMPLE_RATE;
        float volume = (float)INT16_MAX * VOLUME;
        int16_t sample = 0;

        sample = (int16_t)
        (
            (sinf(2*M_PI *   FREQUENCY * t) * volume) +
            (sinf(2*M_PI * 2*FREQUENCY * t) * volume)
        );
        fwrite(&sample, sizeof(sample), 1, stdout);
    }

    return 0;
}