C++ : How to write WAV audio file?

main.cpp

#include <iostream>
#include <fstream>
#include <cmath>

int write_wav_sound()
{
	const int SAMPLE_RATE = 44100;
	const double PI = 3.14159265359;
	const double FREQUENCY = 440.0;
	const double DURATION = 2.0;

	const int NUM_SAMPLES = SAMPLE_RATE * DURATION;
	const int BITS_PER_SAMPLE = 16;

	std::ofstream out("C:/Users/CosmosXYZ/Desktop/Data_TheD/output.wav", std::ios::binary);
	if (!out) {
		return 1;
	}

	const int BYTE_RATE = SAMPLE_RATE * BITS_PER_SAMPLE / 8;
	const int BLOCK_ALIGN = BITS_PER_SAMPLE / 8;
	const int DATA_SIZE = NUM_SAMPLES * BLOCK_ALIGN;

	out.write("RIFF", 4);
	out.write(reinterpret_cast<const char*>(&DATA_SIZE + 36), 4);
	out.write("WAVE", 4);
	out.write("fmt ", 4);
	int format_chunk_size = 16;
	out.write(reinterpret_cast<const char*>(&format_chunk_size), 4);
	short audio_format = 1;
	out.write(reinterpret_cast<const char*>(&audio_format), 2);
	short num_channels = 1;
	out.write(reinterpret_cast<const char*>(&num_channels), 2);
	out.write(reinterpret_cast<const char*>(&SAMPLE_RATE), 4);
	out.write(reinterpret_cast<const char*>(&BYTE_RATE), 4);
	out.write(reinterpret_cast<const char*>(&BLOCK_ALIGN), 2);
	out.write(reinterpret_cast<const char*>(&BITS_PER_SAMPLE), 2);
	out.write("data", 4);
	out.write(reinterpret_cast<const char*>(&DATA_SIZE), 4);

	for (int i = 0; i < NUM_SAMPLES; ++i) {
		double t = static_cast<double>(i) / SAMPLE_RATE;
		double sample = 32767 * sin(2 * PI * FREQUENCY * t);
		short int int_sample = static_cast<short int>(sample);
		out.write(reinterpret_cast<const char*>(&int_sample), 2);
	}
}

int main()
{
	return write_wav_sound();
}