multiplying two matrix.but Getting wrong answer

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This is my Matrix code..i am multiplying two matrix. one of matrix is scalar(means digonal elemnts r same..)but when i run this code Getting wrong answer...

C#

static void Main(string[] args)
        {
            int[,] matrix1 = new int[3, 3];
            int[,] matrix2 = new int[3, 3];
            int[,] result = new int[3, 3];

            for (int i = 0; i < 3; i++)
            {
                for (int j = 0; j < 3; j++)
                {
                    Console.WriteLine("Enter 1st Matrix: ");
                    matrix1[i, j] = Convert.ToInt32(Console.ReadLine());
                }
            }
            Console.ReadLine();
            for (int k = 0; k < 3; k++)
            {
                for (int l = 0; l < 3; l++)
                {
                    Console.WriteLine("Enter 2nd Matrix: ");
                    matrix2[k, l] = Convert.ToInt32(Console.ReadLine());
                }
            }
            Console.WriteLine();
            Console.WriteLine("Matrix 1: ");
            for (int i = 0; i < 3; i++)
            {
                for (int j = 0; j < 3; j++)
                {
                    Console.Write(matrix1[i, j] + " ");
                }
                Console.WriteLine();
            }
            Console.WriteLine();

            Console.WriteLine("Matrix 2: ");
            for (int k = 0; k < 3; k++)
            {
                for (int l = 0; l < 3; l++)
                {
                    Console.Write(matrix2[k, l] + " ");
                }
                Console.WriteLine();
            }
            Console.WriteLine("Matrix 1 * Matrix 2: ");
            for (int i = 0; i < 3; i++)
            {
                for (int j = 0; j < 3; j++)
                {
                    result[i, j] = result[i, j] + matrix1[i, j] * matrix2[i, j];
                    Console.Write(result[i, j] + " ");
                }
                Console.WriteLine();
            }
            Console.ReadLine();
            Console.ReadLine();

        }

Posted 14-Feb-12 22:54pm

Nikhil Dayalpawar

Updated 14-Feb-12 23:02pm

Mehdi Gholam

v2

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CPallini · Accepted Answer · 2012-02-14T23:17:00

The formula you are using is wrong, change

C#

for (int i = 0; i < 3; i++)
            {
                for (int j = 0; j < 3; j++)
                {
                    result[i, j] = result[i, j] + matrix1[i, j] * matrix2[i, j];
                    Console.Write(result[i, j] + " ");
                }
                Console.WriteLine();
            }

to

C#

for (int i = 0; i < 3; i++)
{
  for (int j = 0; j < 3; j++)
  {
    for (int k = 0; k < 3; k++)
    {
       result[i, j] = result[i, j] + matrix1[i, k] * matrix2[k, j];
    }
  }
}