use strict; behaviour not working as expected in Perl wrt $a and $b

Question

I have written a sample perl code:

use strict;
use warnings;
$a=1;
$b=2;
if($b==2) {
    $a=3;
}
print $a;

Ideally, when I run this code, it sh

Answer 1

$a and $b are special variables, and thus are not rising error when used with strict.

From perldoc strict,

Because of their special use by sort(), the variables $a and $b are exempted from this check.