#!/usr/bin/perl
use warnings;
use strict;

my (@limits)= reverse (3,2,3); #changed
my $length= @limits;           #changed

my @number= (1) x $length;

while (@number) {
    printnumber(@number);
    @number= addto(@number); 
}



sub addto {
    my @number= @_;
    while (1) {
    my $carry=1;
    my $i=0;                     #changed
    foreach (@number) {	
        $_+= $carry; $carry=0;
        if ($_>$limits[$i++]) {  #changed
        $_=1;
        $carry=1;
        }
    }
    @number=() if ($carry==1);
    return(@number);
    }
}

sub printnumber {
    my @number= @_;
    print reverse(@number),"\n";
}


#prints
111
112
113
121
122
123
211
212
213
221
222
223
311
312
313
321
322
323