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C# C# Collections Arrays Jagged Arrays

Steven Toh
Steven Toh
2,685 Points
Posted by Steven Toh
Steven Toh
2,685 Points

Jagged and MD array exercises failing despite solution working in Visual Studio

Hi,

For both of these exercises, I am getting the below message:

"The table should contain 6 rows and 6 columns"

I can run the same code in VS (albeit using console output commands) and I get the desired results. The jagged array code:

public static int[][] BuildMultiplicationTable(int maxFactor) { int[][] sheet = new int[maxFactor][];

        for(int row = 0; row < sheet.Length; row++)
        {
            sheet[row] = new int[maxFactor];
            for(int column = 0; column < sheet[row].Length; column++)
            {
                sheet[row][column] = row * column;
            }
       }
        return sheet;
    }

Guessing I am missing something obvious but the function is expecting the array itself to be returned, not a console output.

Thanks.

2 Answers

Steven Parker
Steven Parker
229,771 Points
Steven Parker
Steven Parker
229,771 Points

:warning: Be careful about testing a challenge in an external REPL or IDE.

If you have misunderstood the challenge, it's also very likely that you will misinterpret the results.

You're really close, though. The issue is that your table is too small. To accommodate values up to and including maxFactor, the array dimensions (in both directions) will need to be maxFactor + 1 since the values begin at 0.

Steven Toh
Steven Toh
2,685 Points
Steven Toh
Steven Toh
2,685 Points

Hi Steve,

Doh! Always a simple answer. Thanks for the help.

Kevin Gates
Kevin Gates
15,052 Points
Kevin Gates
Kevin Gates
15,052 Points 
namespace Treehouse.CodeChallenges
{
    public static class MathHelpers
    {
        public static int[][] BuildMultiplicationTable(int maxFactor)
        {
            int[][] sheet = new int[maxFactor+1][];

            for(int row = 0; row < sheet.Length; row++)
            {
                sheet[row] = new int[maxFactor+1];
                for(int column = 0; column < sheet[row].Length; column++)
                {
                    sheet[row][column] = row * column;
                }
            }
            return sheet;
        }
    }
}