Problem The sum of the squares of the first ten natural numbers is, 12 + 22 + … + 102 = 385 The square of the sum of the first ten natural numbers is, (1 + 2 + … + 10)2 = 552 = 3025 Hence the difference between the sum of the squares of …
Problem 2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder. What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20? Solution Again, I build two functions to handle the logic of checking whether a …
Problem A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 x 99. Find the largest palindrome made from the product of two 3-digit numbers. Solution In my solution above, I first built a function to check whether a given number is …
Problem The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number 600851475143 ? Solution As this solution requires a bit more work, I created two helper functions findFactorsOf and isPrime, and as you’ve probably noticed, I had explicitly declare that the value n should be …
Problem Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be: 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, … Find the sum of all the even-valued terms in the sequence which do not exceed four …
Introduction Having spent a bit of time learning the basics of F# I decided to try my hands on actually writing some code and get a better feel of the language and get more used to writing function code in general. And for that purpose, Project Euler provides a great source for small, isolated problems …
When you have a generic interface such as: It’s easy to check whether a given instance implements the IInitializable interface with a specific T: But what if you want to find out if a type implements the IInitializable interface of an arbitrary T? You won’t be able to simply get away with this: Instead, you …
.Net Tips – How to determine if a type implements a generic interface type Read More »
By now you would have no doubt heard about the new dynamic type in C# 4 and how it has changed the way you write interop code in C#. As impressed as I am by it, I have been wondering just how much (if any) of a performance hit we’d have to pay to move …
Performance Test – Dynamic method invocation in C# 4 Read More »
Given a generic class in C# like this one: You will need to specify what the type T should be when you call the constructor: The compiler is not able to use type inference to infer the type T to be int. Now, this is interesting as type inference is supported by any other generic …
The curious lack of type inference support in C# constructors Read More »
For a while now I’ve been curious as to whether the CLR uses the ThreadPool to execute a delegate when BeginInvoke is called: Whilst common sense dictates that this must surely be true, I couldn’t be certain since I haven’t managed to find any confirmation in the documentations. Thanks to Jon Skeet and Jeff Sternal …
.Net Threading – BeginInvoke uses the thread pool Read More »
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