This is the Euclidean algorithm for finding the Greatest common divisor between two numbers. I thought I'd throw a bit of my own code into the fray. The first one uses a loop, the second uses recursion. Could someone benchmark this for me?
#!/usr/bin/perl -w
print "GCD: " . GCD( 45, 5 ) . " RecGCD: " . RecGCD( 45, 5 ) . "\n";
#Assumes $A is the largest number
sub GCD
{
$A = shift;
$B = shift;
$R = 1;
while ( $R != 0 )
{
$R = $A % $B;
if ( $R == 0 )
{
return $B;
}
$A = $B;
$B = $R;
}
}
#Assumes $A is the largest number
sub RecGCD
{
$A = shift;
$B = shift;
$R = 0;
$R = $A % $B;
if ( $R == 0 )
{
return $B;
}
RecGCD( $B, $R );
}
--=Lolindrath=--
-
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.
|