This code solves the problem without "doing math". 

#!/usr/bin/perl -w
 
use strict;
 
my $foo = 17432;
my $bar = 3;
 
$foo =~ s/([0-9]+)([0-9]{$bar})/$1.$2/; 
print $foo;

[download]

MP

In reply to Re: Help with decimals by Monky Python
in thread Help with decimals by La12

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