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[PHP] Solving Euler Project #*

I decided to join [url]http://projecteuler.net/[/url] which has many math problems that are meant to be solved using programming. I decided to solve the first one and post my code. I could've made it shorter, but I wanted to make it easy to read, and frankly, I don't think saving a few tenths of a second will make much of a difference.

[PHP]<?php

/*********************************

* The Euler Project #* Solution *

* Coded By Moonbat *

* July **, 2008 *

*********************************/

echo "<center>Getting all the natural number multiples of * and 5 below *000</center><br><br>";

$multiples = array(); // For keeping hold of all of the multiples

$counter = 0; // For kicks

for ($i=*; $i<*000; $i++)

{

$multiplethree = $i / *;

$multiplefive = $i / 5;

// Checking to see if the answer has a decimal (i.e. not a multiple) of * or 5

$finalthree = str_replace(".", "<b>THIS IS NOT A MULTIPLE OF THREE</b>", $multiplethree);

$finalfive = str_replace(".", "<b>THIS IS NOT A MULTIPLE OF FIVE</b>", $multiplefive);

// If the number doesn't have a decimal, add it to the $multiples array

if (!preg_match("/THIS IS NOT A MULTIPLE OF THREE/i", $finalthree)) {

echo "$i is a multiple of * or 5 <br>";

$multiples[$counter] = $i;

$counter++;

} elseif (!preg_match("/THIS IS NOT A MULTIPLE OF FIVE/i", $finalfive)) {

echo "$i is a multiple of * or 5 <br>";

$multiples[$counter] = $i;

$counter++;

} else {

echo "";

}

}

// BTW, $wallops == 466 for those who are too lazy to run this code

$wallops = count($multiples);

$sum = array_sum($multiples); // Adding the values in the array

echo "<hr> There are<b> $wallops </b>numbers below *000 that are multiples of * or 5<hr>";

echo "The sum of all of these numbers is $sum";

?>[/PHP]

If you haven't figured it out already, I love PHP

Last edited by Moonbat; 07-13-2008 at 03:04 PM.

"Workers of the world unite; you have nothing to lose but your chains." -Karl Marx