Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

C# C# Collections Arrays Jagged Arrays

Rui Martinho
Rui Martinho
21,221 Points
Posted by Rui Martinho
Rui Martinho
21,221 Points

C# Collection, jagged array challenge 1

My code is not validating, and i am receiving the below error message: "The table should contain 6 rows and 6 columns"

My code, is

" namespace Treehouse.CodeChallenges { public static class MathHelpers { public static int[][] BuildMultiplicationTable(int maxFactor) { int[][] arr = new int[maxFactor][];

       for (int i = 0; i < arr.Length; i++)
      { 
           arr[i] = new int[maxFactor];
           for (int j = 0; j <  arr[i].Length; j++)
        {
            arr[i][j] = new int();   
            arr[i][j] = i * j;
        }

       }

        return arr;
    }
}

} "

Can someone help?

Math.cs 
namespace Treehouse.CodeChallenges
{
    public static class MathHelpers
    {
        public static int[][] BuildMultiplicationTable(int maxFactor)
        {
           int[][] arr = new int[maxFactor][];

           for (int i = 0; i < arr.Length; i++)
          { 
               arr[i] = new int[maxFactor];
               for (int j = 0; j <  arr[i].Length; j++)
            {
                arr[i][j] = new int();   
                arr[i][j] = i * j;
            }

           }

            return arr;
        }
    }
}

1 Answer

Steven Parker
Steven Parker
231,248 Points
Steven Parker
Steven Parker
231,248 Points

:point_right: Your array is a bit too small.

Remember that the first row and column of the array will be 0, so to accommodate factors up to and including maxFactor, you'll need an array size of maxFactor + 1.

Rui Martinho
Rui Martinho
21,221 Points
Rui Martinho
Rui Martinho
21,221 Points

Perfect.

It validated.

Thank you, Steven Parker