else {
  ($num=$num1++);
  print $num;
  print "\n";
}

##</code><code>##

unless ($num1=$num2) {
  print $num2;
}

##</code><code>##

else {
  $num=$num1;
  while ( $num <= $num2 ) {
     print $num;
     $num++
  }
}