See for yourself:

#!/usr/bin/perl
use strict;

my $i = 1;
my ($quo1, $rem1) = ($i/5, $i%5); #need to understand modulo
print "Without int:  Quotient = [$quo1], Remainder = [$rem1]\n";

my ($quo2, $rem2) = (int($i/5), $i%5); #modified to use int
print "   With int:  Quotient = [$quo2], Remainder = [$rem2]\n";

exit;
__END__
[download]

Results:

D:\PerlMonks>modulo1.pl
Without int:  Quotient = [0.2], Remainder = [1]
   With int:  Quotient = [0], Remainder = [1]

D:\PerlMonks>
[download]