#!/usr/bin/perl

use strict;

my $numrgx = qr/^-?[\d.]+(?:e[+-]\d{2})?$/;

my @try_these = ( 
    "0.2000000000000001",
    "0.3000000000000001"
);

for ( @try_these ) {
    my $x = my $y = $_;
    $y .= "1";

    my $same = ( $x eq $y );
    if ( ! $same and
         ( $x =~ /^-?\.?\d/ and $x =~ /$numrgx/ ) and
         ( $y =~ /^-?\.?\d/ and $y =~ /$numrgx/ )) {
        $same = ( $x == $y );
    }
    my $cmp = ( $same ) ? "is the same as" : "differs from";

    print "$x $cmp $y\n";
}