sub hello3 {
    if ($nice) {
        return "Hi"
    }
    else {
       return "Get Lost!"
    }
}

##</code><code>##

sub hello3 {
    return $nice ? "Hi" : "Get Lost!"
}

##</code><code>##

print "you were asking for it!" unless $nice;

# or a return statement,
# when you just need to check a requirement 
# in the middle of a sub

sub hello {
    return "get lost" unless $nice;
    # more statements
    return "hi"
}

##</code><code>##

$nice > 0 or print "Now I am goin to teach you ...";