i have this two files below. the first one produces no errors but the second one produces the following errors:

Global symbol "$x" requires explicit package name (did you forget to declare "my $x"?) at ./two.pl line 6.
Global symbol "$y" requires explicit package name (did you forget to declare "my $y"?) at ./two.pl line 7.
Global symbol "$x" requires explicit package name (did you forget to declare "my $x"?) at ./two.pl line 10.
Global symbol "$y" requires explicit package name (did you forget to declare "my $y"?) at ./two.pl line 13.
Global symbol "$x" requires explicit package name (did you forget to declare "my $x"?) at ./two.pl line 15.
Global symbol "$y" requires explicit package name (did you forget to declare "my $y"?) at ./two.pl line 15.
Execution of ./two.pl aborted due to compilation errors.

this is file 1: 

#!/usr/bin/perl

use warnings;
use strict;

$a=0;

chomp($a=<STDIN>);
print $a, "\n";

[download]
and this is file 2: 
#!/usr/bin/perl

use warnings;
use strict;

$x=0;
$y=0;

print "enter first number ";
chomp($x=<STDIN>);

print "enter second number ";
chomp($y=<STDIN>);

print "Product ",$x*$y, "\n";

[download]
i can't seem to figure out what's causing the errors for file 2. the declaration is the same in both files.

In reply to question on declaring variables by badbanana

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.