Monday, December 29, 2008

Project Euler and PowerShell - Problem 1

Was looking at Pete on Software the other day and saw a reference to Project Euler. What a cool site! Basically, the intent of this site is to use computational/programming skills to solve increasing complex mathematical problems. This seemed like an interesting way to test my PowerShell skills. The next few blog posts will be my attempts at solving a few of these.

- Spoiler Alert -

If you have any interest in solving any of these problems at Project Euler, quit reading this post and immediately pull up your programming editor of choice and have at it.

Problem 1: 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.

$result = 0
for($i = 0; $i -lt 1000;$i++)
{
if ($i % 3 -eq 0 -or $i % 5 -eq 0)
{
$result += $i;
}
}
$result

3 comments:

Doug said...

Good stuff. Another way to skin the cat.

1..999 |
Where {$_ % 3 -eq 0 -or $_ % 5 -eq 0} |
ForEach {$sum=0} {$sum+=$_} {$sum}

Wes Stahler said...

Gotta love the one-liners! Thanks Doug!

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