C++ write to binary file.

code.cpp

#include <iostream>
#include <fstream>
using namespace std;



int main()
{
	ofstream out;
	out.open("out.bin", ios::out | ios::binary | ios::trunc);

	// check open file for write
	if (!out.is_open()) {
		cerr << "Error in open file './out.bin'" << endl;
		return 1;
	}

	// write integer
	// in hex is '6f'
	int num = 111;
	out.write(reinterpret_cast<const char*>(&num), sizeof(num));

	// write char
	// in hex is '65'
	int ch = 'e';
	out.write(reinterpret_cast<const char*>(&ch), sizeof(ch));

	// close (write data in buffer to file)
	out.close();

	return 0;
}