How do I create a GetAverage method for a 3x3 retangular array in C#?

Olympus 1 Reputation point
2022-02-28T02:05:46.617+00:00

I am having trouble figuring this out. I need to put items in a 3x3 rectangular array and then average them. This is my code for putting the values in the array:

                    // Add Values to Rectangular Array
                    for (int i = 0; i < retailPrices.GetLength(0); i++)
                    {
                        for (int j = 0; j < retailPrices.GetLength(1); j++)
                        {
                            retailPrices[i, 0] = wholesaleCost;
                            retailPrices[i, 1] = markupPercentage;
                            retailPrices[i, 2] = futureValue;
                        }
                    }

This is my code for my GetAverage Method:

  private decimal GetAverage(decimal[,] retailPrices)
        {
            decimal sum = 0m;
            for (int i = 0; i < retailPrices.GetLength(0); i++)
            {
                for (int j = 0; j < retailPrices.GetLength(1); j++)
                {
                    sum += retailPrices[i, j];
                }
            }
            decimal average = sum / retailPrices.GetLength(0);
            return average;
        }

What is the correct way to do this? What am I doing incorrectly? Please correct my code.

C#
C#
An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.
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  1. Viorel 112.9K Reputation points
    2022-02-28T09:44:12.783+00:00

    To calculate the average of all nine values:

    using System.Linq;
    . . .
    private decimal GetAverage( decimal[,] retailPrices )
    {
       return retailPrices.Cast<decimal>( ).Average( );
    }
    
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  2. Bruce (SqlWork.com) 57,646 Reputation points
    2022-02-28T17:54:38.557+00:00

    You need to calc the size of the arrays.

       private decimal GetAverage(decimal[,] retailPrices) 
             { 
                 decimal sum = 0m; 
                 decimal count =0m; 
                 for (int i = 0; i < retailPrices.Length; i++) 
                 { 
                     count += retailPrices[i].Length; 
                     for (int j = 0; j < retailPrices[i].Length; j++) 
                     {
                         sum += retailPrices[i, j]; 
                     } 
                 } 
                 decimal average = sum / count; 
                 return average; 
             } 
    
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