Hello to everyone, I have a sub{} that gets a number, divies it by 222 and prints out the reasult : 
#!/usr/bin/perl -w
use strict;

sub longdiv($) {
    # take the parameter passed into the sub and store in $in
    my $in = shift;

    # initialise $carry and $out variables
    my $carry = 0;
    my $out = '';

    # for each position in the $in string
    for (my $i = 0; $i < length($in); $i++) {

        # take a single character at that position and store in $numer
+ator
        my $numerator = substr($in, $i, 3);

        # add $carry to it
        $numerator += $carry;

        # $carry equals $numerator mod 222
        $carry = ($numerator % 222);

        # append the integer division of $numerator by two to the end 
+of the $out variable
        $out .= int($numerator / 222);
    }

    # return the result
    return $out;
}

# call the function and print the output
print longdiv2("15000000") . "\n";

[download]
now, i hope there's no problem up to here; but what i need is that function in reverse (yes... i have slight problems with mathematics...), that means that the new function should get the $carry and $out of longdive() and reasult with $in, but not by just $out*222+$carry, because i work with numbers that have thousands of digits... Thanks in advance.

In reply to Reversed long division by Smoke

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