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C# C# Collections Arrays Jagged Arrays

Posted by Patrick Torrens
Patrick Torrens
2,566 Points

I've done this code in visual studio and it works, but I can't find the specific answer to solve the question.

I'm getting rather frustrated. The code I've typed into the box in the browser works fine - I've checked it in Visual Studio. I understand the problem, I can solve it, but the system won't accept my code because it seems to be looking for a very specific answer. This is annoying as there are multiple ways to solve this problem.

Math.cs 
namespace Treehouse.CodeChallenges
{
    public static class MathHelpers
    {
        public static int[][] BuildMultiplicationTable(int maxFactor)
        {
            // Create a zero based array of size maxFactor x MaxFactor
            maxFactor = maxFactor + 1;

            int[][] array = new int[maxFactor, maxFactor];


            // loop over 0 to maxfactor in a nested loop to fill the array
            int ycount = 0;
            while (ycount < maxFactor)
            {
                int xcount = 0;
                while (xcount < maxFactor)
                {
                    array[xcount,ycount] = xcount * ycount;
                    xcount = xcount + 1;
                }
                ycount = ycount + 1;
            }
            // return the array
            return array;
        }
    }
}

1 Answer

caitlinsheeks
caitlinsheeks
5,423 Points
caitlinsheeks
caitlinsheeks
5,423 Points

Just at first glance, I see this:

int[][] array = new int[maxFactor, maxFactor];

If you're creating a jagged array, you need to have something like this:

int[][] array = new int[maxFactor][];

Within the inner loop, you'll need to initialize the inner array.

I don't know if you still need the help, but I figured this might help someone else, at least.