As $x can never be less than $x, you can turn each second if in each block into elsif (provided it has been covered). 
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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In reply to Re^2: John Guttag's book - 2nd exercise. My attempt in Perl. by choroba
in thread John Guttag's book - 2nd exercise. My attempt in Perl. by pritesh_ugrankar

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