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First, it doesn't seem to work correctly.    I tried with the expression (+ 1 2 3 (* 4 3 (- 20 1) (% 5 2)) 3 4) and got the answer 2221 when it should be 241.

sub solvepart($); ... sub reformat; ... sub reformat($){ ... sub solvepart($){

The declaration for reformat doesn't have a prototype but the definition does even though reformat does not accept any arguments    YOU SHOULD NOT USE PROTOTYPES.

if ($given ~~ /(?:exit)|(?:end)|(?:quit)/i){ ... if ($VERBOSE or $VERBOSE ~~ /v(?:erbose)?/i){

Is there any good reason to use the smartmatch operator (~~) instead of the binding operator (=~)?    /(?:exit)|(?:end)|(?:quit)/i could be written more simply as /exit|end|quit/i.

my $num=qr/(-?\d++\.?\d*?)/; ... unshift(@stack, [$2,$3,$4]) while $given =~ s/(.*)\((\S++) ++(-?\d +++\.?\d*?) ++(-?\d++\.?\d*?)?\)/$1/;

Why define $num if you are not going to use it?

if ($level[0]eq'+'){ $level[2] ?($value=$level[1]+$level[2]) :($value+=$level[1]); } elsif ($level[0]eq'-'){ $level[2] ?($value=$level[1]-$level[2]) :($value=$level[1]-$value); } elsif ($level[0]eq'/'){ $level[2] ?($value=$level[1]/$level[2]) :($value=$level[1]/$value); } elsif ($level[0]eq'*'){ $level[2] ?($value=$level[1]*$level[2]) :($value*=$level[1]); } elsif ($level[0]eq'**'or$level[0]eq'^'){ $level[2] ?($value=$level[1]**$level[2]) :($value=$level[1]**$value); } elsif ($level[0]eq'%'){ $level[2] ?($value=$level[1] % $level[2]) :($value=$level[1] % $value); }

Could be written more simply as:

if ($level[0]eq'+'){ $value = $level[1] + $level[2] || $value; } elsif ($level[0]eq'-'){ $value = $level[1] - $level[2] || $value; } elsif ($level[0]eq'/'){ $value = $level[1] / $level[2] || $value; } elsif ($level[0]eq'*'){ $value = $level[1] * $level[2] || $value; } elsif ($level[0]eq'**'or$level[0]eq'^'){ $value = $level[1] ** $level[2] || $value; } elsif ($level[0]eq'%'){ $value = $level[1] % $level[2] || $value; }

Update: this is how I would probably do it:

In reply to Re: Polish Prefix Calculator by jwkrahn
in thread Polish Prefix Calculator by protist

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