This is a difficult problem in Perl for the most general case.
Numbers like 1111111111111111111e1111111111111111111 pass the 'looks_like_number' test but don't fare well in arithmetic expressions.
This doesn't do what you would hope:
use strict;
use warnings;
use Scalar::Util qw(looks_like_number);
my $c="11111111111111111e11111111111111111";
my $d="22222222222222222e22222222222222222";
if (looks_like_number($c) and
looks_like_number($d) and
$c == $d) {
print "$c = $d\n";
}
It should work perfectly the first time! - toma
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|