Category Archives: Software Development

This category contains all my posts about software development. Tutorials, solutions to problems I’ve met, interesting things I’ve stumbled over, code samples, stuff I don’t want to forget, et cetera.

Project Euler: Just two tiny notes

Just two things I felt like mentioning:

Thing number one

I got tired of the page 2 stuff. So, I swapped all the <!–nextpage–> things with <!–more–> and a header. Which means that the solution will now be on the same page as the problem. (Although not on the index page).

Thing number two

My brother puts his whole solution on a public subversion repository, which is a very good idea. Following his good example, I did a repository dump of my local VisualSVN Server and… undumped(??) it into one I set up here on my web host which I will be using from now on instead.

Update: SubVersion turned out to be a bit blah sometimes, so I am trying out Mercurial now instead. The repository has been converted and published on BitBucket. Mercurial seems a lot nicer than SubVersion so far. You can find a very good introduction at

Thing number three

Works On My MachineOk, ok, the topic says two, but I just figured I should maybe mention one more thing. You see, the code you will find in my aforementioned subversion repository cannot be run. Like, there is no main method or anything there. That is because I am trying to teach myself how to use test cases, etc. So, instead of creating an executable program for each problem or one program with fancy “Solve problem #n”-buttons, I decided to just do it all in test cases. So, my solutions are actually found as part of the test project (well, the running of them anyways). I am using to run them, and it works great. This way I can also do a lot of changes, and then just run my tests and make sure that all my solutions still calculate correctly. Awesome stuff.

Project Euler: Problem 8

Find the greatest product of five consecutive digits in the 1000-digit number.


Continue reading Project Euler: Problem 8

WP Latex test page

So, as my brother noticed in my last post, I have some cool equations here. The brilliance behind it is something called LaTeX, which can be used in WordPress blogs thanks to the WP LaTeX plugin.

I am a total LaTeX newbie though, so I often struggle a bit with… getting it right. Trying it out by previewing WordPress posts is sloooow, so I decided to create myself a simple test-rig. A simple web page with a form and a button.

Let me know if you like it: 8)

Project Euler: Problem 6

The sum of the squares of the first ten natural numbers is,

1^2 + 2^2 + \ldots + 10^2 = 385

The square of the sum of the first ten natural numbers is,

(1 + 2 + \ldots + 10)^2 = 55^2 = 3025

Hence the difference between the sum of the squares of the first ten natural numbers and the square of the sum is 3025 — 385 = 3640.

Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.

So, apparently my brother has joined me on my Project Euler solving quest. You can see his Delphi solution on his blog. My C# solution, you can find below 🙂

Continue reading Project Euler: Problem 6