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Re: how to make a function recursive [message #174970 is a reply to message #174968]

Wed, 27 July 2011 19:51

Denis McMahon
Messages: 634
Registered: September 2010

Karma:

Senior Member

On Wed, 27 Jul 2011 10:58:55 -0700, jr wrote:

The following will, I think, do what you want. As an exercise in learning
php, I leave it to you to work out how it does it. Sorry if these seems
rather abrupt of me, but your question sounds like a tutorial or homework
of some sort, so I'm not prepared to provide both an explanation and
working code.

<?php
function t($a)
{
$c = 0;
foreach ($a as $i=>$d) if ($d>0) $c++;
return $c;
}
function r($a,$i=0)
{
if (t($a)==1) return $a;
do
{
$i+=1;
if ($i==count($a)) $i=0;
}
while (($a[$i])<0);
$a[$i]=-1;
do
{
$i+=1;
if ($i==count($a)) $i=0;
}
while (($a[$i])<0);
return r($a,$i);
}
$a = array();
for ($i=0;$i<100;$i++) $a[]=1;
$a = r($a);
foreach ($a as $i=>$d) if ($d>0) echo "{$i} ";
echo "\n";
?>

Rgds

Denis McMahon

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[Message index]

		how to make a function recursive By: jr on Wed, 27 July 2011 17:58
		Re: how to make a function recursive By: Denis McMahon on Wed, 27 July 2011 19:51
		Re: how to make a function recursive By: Denis McMahon on Wed, 27 July 2011 19:51

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