#returns the sum of two numbers...woohooo! yeah! hurrah! go go go!

sub add($$) {
    my ($Val1, $Val2) = @_;
    my ($Result, $Tmp, $In_Mente);
    (length($Val1) < length($Val2)) ? ($Val1, $Val2)=($Val2, $Val1):0;
    while (length($Val2) || length($Val1)) {
        $Tmp = substr($Val1,-1,1) + substr($Val2, -1, 1) + $In_Mente;
        if ($Tmp > 9) { $In_Mente = 1; $Tmp -= 10;}
        else { $In_Mente = ''; }
        $Result = $Tmp . $Result;
        substr($Val1, -1, 1) = undef;
        substr($Val2, -1, 1) = undef;
        my $FResult = $Result;
        last if ($In_Mente == 0 && !length($Val2));
        }
    $Result = $Val1 . $Result;
    return $Result;
    }

print add(
'758347583475824708465850936890539684658943757345975984752849365497545
+795960625230652406542096545654396529602555796453760493262845932848528
+465284698946983489698348968953896085976085938896556980853272085924509
+275205062523065240654209654565439652960255579645376049326284593284852
+846528469894698348969834896895389608597608593889655698085327208592450
+927520545497858944986599457743276035860935689348693496896892469284698
+938496893248683563969350683680363509090349639065903596953',
'285725894275576849327508974289653847683579346753477201532635062523065
+240654209654565439652960255579645376049326284593284852846528469894698
+348969834896895389608597608593889655698085327208592450927520506252306
+524065420965456543965296025557964537604932628459328485284652846989469
+834896983489689538960859760859388965569808532720859245092752059726509
+4270'
);

[download]

In reply to oldschool math by Anonymous Monk

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