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  1. or download this
    chomp($ask);         # chomp() here rather than chop()
if ($ask eq $add) {
$z = $x + $y;
print "$x + $y = $z";}
  2. or download this
    chomp($ask);    
if ($ask eq $add || $ask == 1) {
$z = $x + $y;
print "$x + $y = $z";}