I'm a professional game developer from Wakefield, England, working as a senior programmer for Rebellion North.

I'm a married father of five and I a also sometimes do Retroburn stuff.

Martin 'Bytrix' Caine

Father. C++ Games Programmer. Cyclist. Guitarist.

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Monday, May 31st 2010 / Web

Project Euler - Problem 1

Someone I'm following on Twitter posted a link to an interesting site called Project Euler. It's full of interesting maths puzzles which are designed in such a way that you should create a program to calculate the result for you.

I like the look of the puzzles on the site and they remind me a little of the ones I've done in the past on the Facebook Puzzles page.

I've decided to start working my way through them when I get spare time and I'll be trying to work out PHP solutions to the problems and will post them here.

The details for problem 1 are below:

If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.

Find the sum of all the multiples of 3 or 5 below 1000.

The program was pretty simple, just work up from 1 to 999 and if the number is divisible by 3 or 5 add it to the total and output:



<?
/******************************************************************
*  ProjectEuler.net  *  Problem 1  *  2010-05-31  *  Martin Caine *
******************************************************************/

$total = 0;

// check $i between 1 and 999
for( $i=1; $i<1000; $i++ )
{
    // if $i divides by 3 or 5 add to the total
    if( ($i/3)==(int)($i/3) || ($i/5)==(int)($i/5) )
    {
        $total += $i;
    }
}

echo $total;

?>

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Tags: php project euler web