May 2010 / Archive / Martin Caine

I'm a professional game developer from Wakefield, England.

I'm married with four children and I am the director and lead programmer of Retroburn Game Studios.

Martin 'Bytrix' Caine

All round web guy, games programmer and musician.

Project Euler - Problem 8



<?
/******************************************************************
*  ProjectEuler.net  *  Problem 8  *  2010-05-31  *  Martin Caine *
******************************************************************/

$string  = '73167176531330624919225119674426574742355349194934';
$string .= '96983520312774506326239578318016984801869478851843';
$string .= '85861560789112949495459501737958331952853208805511';
$string .= '12540698747158523863050715693290963295227443043557';
$string .= '66896648950445244523161731856403098711121722383113';
$string .= '62229893423380308135336276614282806444486645238749';
$string .= '30358907296290491560440772390713810515859307960866';
$string .= '70172427121883998797908792274921901699720888093776';
$string .= '65727333001053367881220235421809751254540594752243';
$string .= '52584907711670556013604839586446706324415722155397';
$string .= '53697817977846174064955149290862569321978468622482';
$string .= '83972241375657056057490261407972968652414535100474';
$string .= '82166370484403199890008895243450658541227588666881';
$string .= '16427171479924442928230863465674813919123162824586';
$string .= '17866458359124566529476545682848912883142607690042';
$string .= '24219022671055626321111109370544217506941658960408';
$string .= '07198403850962455444362981230987879927244284909188';
$string .= '84580156166097919133875499200524063689912560717606';
$string .= '05886116467109405077541002256983155200055935729725';
$string .= '71636269561882670428252483600823257530420752963450';

$max = 0;

for( $i=0; $i<996; $i++ )
{
  $sum = intval( substr( $string, $i, 1 ) ) *
         intval( substr( $string, $i+1, 1 ) ) *
         intval( substr( $string, $i+2, 1 ) ) *
         intval( substr( $string, $i+3, 1 ) ) *
         intval( substr( $string, $i+4, 1 ) );
  if( $sum > $max )
  {
    $max = $sum;
  }  
}

echo $max;
?>

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Tags: php project euler web

Monday, May 31st 2010 / Web

Project Euler - Problem 7



<?
/******************************************************************
*  ProjectEuler.net  *  Problem 7  *  2010-05-31  *  Martin Caine *
******************************************************************/

// create an array to store the primes
$primes = array();
$primes[] = 2;
// count the primes
$i = 1;

$n = 2;

// break when we get to 10001
while( $i < 10001 )
{
  $n++;
  $isPrime = true;
  foreach( $primes as $prime )
  {
    if( ($n/$prime) == (int)($n/$prime) )
    {
      $isPrime = false;
      break;
    }
  }
  
  if( $isPrime )
  {
    $primes[] = $n;
    $i++;
  }
}

echo $primes[10000];

?>

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Tags: php project euler web

Monday, May 31st 2010 / Web

Project Euler - Problem 6

It took less than a minute to complete puzzle number 6 from Project Euler:

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Tags: php project euler web

Monday, May 31st 2010 / Web

Project Euler - problem 5

Problem 5 (yes these are pretty quick ones) from Project Euler is a really easy one again:

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Tags: php project euler web

Monday, May 31st 2010 / Web

Project Euler - problem 4

Another pretty easy one from Project Euler, puzzle 4 simply required building an array of values based on calculations and sorting them to find the highest values:

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Tags: php project euler web

Monday, May 31st 2010 / Web

Project Euler - problem 3

The third problem from Project Euler was a little more complex:

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Tags: php project euler web

Monday, May 31st 2010 / Web

Project Euler - problem 2

The second Project Euler problem was another simple one:

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Tags: php project euler web

Monday, May 31st 2010 / Web

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.

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Tags: php project euler web

Thursday, May 27th 2010 / XNA

The Fresnel term

I've spent the last few days reworking some of the core shaders in my XNA games and in particular working on the shaders that render the cars in our racing game Shadow Racers.

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Tags: fresnel shadow racers xna

Tuesday, May 25th 2010 / Blog

The Lost finale

Last night I sat down for two hours with my Wife Laura and together we watched the final episode of Lost after watching the full six seasons together over the past two years.

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Tags: blog lost tv