Logical Randomising II

[shamuraq]

[scenario]

 

I'm randomising 4 variables as such:

 

<?

$a = rand(1,9);

$b = rand(1,9);

$c = rand(1,9);

$d = rand(1,9);

 

echo "$a * $b = $c * $d;

?>

 

[Question]

 

How do i make sure $a * $b = $c * $d, and no decimal?

 

Thanx in advance....

[Daniel0]

do {
$a = rand(1,9);
$b = rand(1,9);
$c = rand(1,9);
$d = rand(1,9);
} while ($a * $b != $c * $d);

[sasa]

or

<?php
$a = rand(1,9);
$b = rand(1,9);
$x = $a * $b;
$arr = array();
for ($i = 1; $i <= sqrt($x); $i++) if (($x % $i == 0) and $x / $i < 10) $arr[] = $i;
$c = $arr[rand(0, count($arr)-1)];
$d = $x / $c;
echo "$a, $b; $c, $d";
?>

[shamuraq]

thanx guys....