I'm trying to write a program to check if a number is a power of 5, but I came across a weird problem. Bellow is a code which illustrates my issue:
my $x = 125;
my $l = log($x) / log(5);
print "LOG == $l\n";
print "int(LOG) == ", int($l), "\n";
print "Are equal: ", ($l == int($l)) ? "true\n" : "false\n";
LOG == 3
int(LOG) == 3
Are equal: false
For $x = 25
it works as expected, but for $x = 125
(and probably other numbers), it acts really weird. It says that 3 != int(3)
. I'm wondering how is this possible... Is there some explanation for this?
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:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, 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, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||