I believe the above posted code is incorrect. An example string that breaks this is: 
0001111000001111000001111000001111000001111000001111000001111000001111
+000000000000000000000000000000000000000000000000000000000000000000000
+000000000000000000000000001111000001111000001111000001111000001111000
+00111100000111100000111100000111100000111100

[download]
One correct way of doing bin2hex is: 
sub bin2hex {
    my $line = $_[0];
    my $lenCount = 4;
    my $hexLine = "";
    my $width = '4';

    while ( length($line) % $width != 0) {
        $line = '0' . $line;
    }

    while ($lenCount <= length($line)) {
        my $x = substr ($line, -($lenCount), $width);
        $hexLine = sprintf("%X", oct("0b$x")).$hexLine;
        $lenCount += 4;
    }

    print "In bin2hex: $line\nAfter bin2hex: $hexLine\n\n";
    return $hexLine;
}

[download]

2020-03-04 Athanasius added code tags.

In reply to Re^4: How to convert binary to hexadecimal by Anonymous Monk
in thread How to convert binary to hexadecimal by vaas_m

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.