Humanizing bytesize in C/C++

snippet.h

string hByte(unsigned int bytes){
    string r;
    if (bytes <= 0) r = "0 Bytes";
	else if (bytes >= 1073741824) r = to_string(bytes/1073741824) + " GBytes";
	else if (bytes >= 1048576) r = to_string(bytes/1048576) + " MBytes";
	else if (bytes >= 1024) r = to_string(bytes/1024) + " KBytes";
	return r;
};