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  1. or download this
    # "Official" import mechanism
use Interpolation commify => sub {
...
$a = 12345.21;
$b = 1357.98;
print "$a*$b with commas inserted looks like '$commify{$a*$b}'.\n";
  2. or download this
    # Non-obfuscated form, using tie():
use Interpolation;
...
$a = 12345.21;
$b = 1357.98;
print "$a*$b with commas inserted looks like '$commify{$a*$b}'.\n";