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# Tuesday, 26 July 2011
( VS2010 )

I use son of obsidian from http://studiostyl.es/ with the following change:

Current Line Extension to gray

image

| | # 
# Thursday, 16 December 2010
( Euler | TDD | VS2010 )

I decided to try and do Test Driven Development here, so avoid any small problems.

Problem was that my test harness in VS2010 wouldn’t start the agent: http://stackoverflow.com/questions/4446416/vs2010-test-runner-unable-to-start-agent-process (Edit: It was Avira AntiVirus that was the culprit)

alt text

After reinstalling VS2010, and trying to remember all the changes I’ve made since it last worked.. I can run all the tests, just not in the debugger.  Which is very useful.

Euler problem is interesting:

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 the first ten natural numbers and the square of the sum is 3025 − 385 = 2640.

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

Source code here:    

 

class Program
{
static void Main(string[] args)
{
stuff thing = new stuff();
double sumOfSqaures = thing.sumOfSquares(100);
double sqaureOfSums = thing.SquareOfSum(100);
double result = sqaureOfSums - sumOfSqaures;
Console.WriteLine(result);
}
}

public class stuff
{
public double sumOfSquares(double upToInt)
{
double total = 0;
for (int i = 1; i <= upToInt; i++)
total += Math.Pow(i, 2);

return total;
}

public double SquareOfSum(int upToInt)
{
double sum = 0;
for (int i = 0; i <= upToInt; i++)
sum += i;

return Math.Pow(sum, 2);
}
}

and test code:

[TestClass]
public class UnitTest1
{
[TestMethod]
public void SumOfSquaresOfFirst10()
{
stuff thing = new stuff();
double result = thing.sumOfSquares(10);
Assert.AreEqual(385, result);
}

[TestMethod]
public void SquareOfSumOfFirst10()
{
stuff thing = new stuff();
double result = thing.SquareOfSum(10);
Assert.AreEqual(3025, result);
}

[TestMethod]
public void DifferenceBetweenTwoAbove()
{
stuff thing = new stuff();
double sumOfSqaures = thing.sumOfSquares(10);
double sqaureOfSums = thing.SquareOfSum(10);
double result = sqaureOfSums - sumOfSqaures;
Assert.AreEqual(2640, result);
}

}

It was great using TDD.. made it very easy, and got answer right first time!

| | # 
# Friday, 05 November 2010
( VS2010 )
Debug.WriteLine("asdf");
System.Diagnostics.Trace.WriteLine("asdfasdf");

Second one works in release mode.
 
Useful to : "Redirect all Output Window text to the Immediate Window" is checked under Tools -> Options -> Debugging -> General.
| | #