if ($x = $y) {
   print "$y = $x\n";
}

##</code><code>##

print "$y = $x\n" if ($x = $y);

##</code><code>##

if ($y eq $x) {
 print "$y = $x\n";
} 
elsif ($debug eq 1) {
 print "$y != $x\n";
}