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The tricky part for me was coming up with a good way to determine when parentheses should be used. I decided to save the operator priority of each term, so I could compare it to the priority of the next operator. I'm interested to see how other people tackle this problem.

118 characters in the body of the sub:

%o = ('+' => 1, '-' => 1, '*' => 2, '/' => 2, ); sub rpn2ltr { for$i(@r=@_){if($p=$o{$i}){$_=$p>$_->[0]?"($_->[1])":$_->[1] for$r=pop,$l=pop}push@_,[$p||9,$p?"$l $i $r":$i]}$_[-1][1] }

In reply to Re: (Golf) Reversing RPN Notation by chipmunk
in thread (Golf) Reversing RPN Notation by Masem

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