#include <iostream>
#include <fstream>
 
using namespace std;
 
int main() {
	string location;
	size_t file_size;
 
	cin >> location >> file_size;
 
	fstream write_file( location, ios::out | ios::binary );
 
	for( size_t i = 0; i != file_size; ++i )
	{
	    // use write_file.write() to add bytes into your binary file.
	    // the line below adds empty chars into your file (jut to fill it)
	    write_file.write( "", 1 );
	}
 
	write_file.close();
	return 0;
}

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YmluYXJ5LmRhdCAxMDI0

binary.dat 1024