Whitelisting With a Hostname?

I am currently wondering how I would make a whitelist based off of a computer name.

For example: if my hostname (computer name) was equal to BOBCOMPUTER then I would like it to run a certain code, and if not then an exit code.

Should like something like this:

if(computerName == "BOBCOMPUTER"){
    cout << "Welcome Bob!\n";
}else{
    return 0;
}

Thanks if you can help!

-Buzzed451