Perl does its arithmetic with double-precision floating point, so you probably get 52-bit precision.

for (49..54) {
  $x=2**$_;
  $y = $x + 1.1;
  print $_, "\t", $y-$x;
}

49    1.125
50    1
51    1
52    1
53    2
54    0

[download]

In C++, the size of integer types isn't specified, but long long is probably 64 bits.

If you want to deal with really big numbers, you need to use a package like Math::BigInt.

If you only use ++ and reverse on your "numbers", perl's increment magic will make it Just Work (TM).

$x="100000000000000000000";
$x++;
print $x, "\n";
$x += 1;
print $x, "\n"';

100000000000000000001
1e+20

[download]

In reply to Re: Program Not Printing Help by no_slogan
in thread Program Not Printing Help by Hrand

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.