# Project Euler #13

It's been a while since I did one of the Project Euler problems. And since a lot of my work recently has been fixing bugs and working on some design documents, I was itching to do some "real" coding. So it's on to problem #13.

Work out the first ten digits of the sum of the following one-hundred 50-digit numbers.

It would be nice if I could have stuck all of those numbers in an integer and simply added them up, but they were too big for that. The solution I came up with kind of feels like I cheated a bit, but it gives me the correct answer! What I did was take the list of 50-digit numbers and stick a decimal point in the middle (at the 25th character). This gives me a number that .NET's double data type can handle. I just had to make sure I removed the decimal point before grabbing my answer.

So my final solution was:

1: string[] numbers = {

2: // giant list of numbers from website clipped

` 3: };`

` 4: `

5: var list = from num in numbers

6: select double.Parse(num.Insert(25, "."));

` 7: `

` 8: var sum = list.Sum();`

9: string answer = sum.ToString().Replace(".", "").Substring(0, 10);