#!/usr/bin/perl

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The next two lines should be: 

use warnings;
use strict;

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open TAB, "test.txt";

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You should always verify that the file opened correctly: 

open TAB, '<', 'test.txt' or die "Cannot open 'test.txt' $!";

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    $diff = "$tab[0]" - "$seed";

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You are converting the contents of the variables to strings and then subtracting which converts them back to numbers. Just use the variables directly: 

    $diff = $tab[0] - $seed;

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    if ($diff ge 0.1)

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You are using a text comparison operator on numeric data when you should be using a numerical comparison operator: 

    if ($diff >= 0.1)

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{print "@tab\n" && $seed eq $tab[0]}

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The logical AND operator && has relatively low precedence so it is evaluated first and the result of "@tab\n" && $seed eq $tab[0] is passed to the print operator. 

{print "@tab\n"; $seed eq $tab[0]}

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In reply to Re: Simple iteration problem by Anonymous Monk
in thread Simple iteration problem by Etbr77

Title:
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