Simple matrix multiplication sample

matrixmultiplication.cs

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*/

using System;

namespace matmulbefore
{
    class Program
    {
        const int rows = 10;
        const int columns = 10;

        static void Main(string[] args)
        {
            int[,] op1 = new int[rows, columns];
            int[,] op2 = new int[rows, columns];
            int[,] result = new int[rows, columns];

            for (var i = 0; i < 2000000; i++)
            {
                Initialize(ref op1, ref op2);
                Multiply(op1, op2, ref result);
            }

            Console.WriteLine("\nOperand1:");
            Display(op1);

            Console.WriteLine("\nOperand2:");
            Display(op2);

            Console.WriteLine("\nResult:");
            Display(result);
        }

        static void Initialize(ref int[,] matrixA, ref int[,] matrixB)
        {
            Random rnd = new Random();

            for (var i = 0; i < rows; i++)
            {
                for (var j = 0; j < columns; j++)
                {
                    matrixA[i, j] = rnd.Next(0, 9);
                }
            }

            for (var i = 0; i < rows; i++)
            {
                for (var j = 0; j < columns; j++)
                {
                    matrixB[i, j] = rnd.Next(0, 9);
                }
            }
        }

        static void Multiply(int[,] matrixA, int[,] matrixB, ref int[,] matrixC)
        {
            for (var i = 0; i < rows; i++)
            {
                for (var j = 0; j < columns; j++)
                {
                    matrixC[i, j] = 0;
                    for (var inner = 0; inner < columns; inner++)
                    {
                        matrixC[i, j] += matrixA[i, inner] * matrixB[inner, j];
                    }
                }
            }
        }

        static void Display(int[,] sampleArray)
        {
            for (var i = 0; i < rows; i++)
            {
                for (var j = 0; j < columns; j++)
                {
                    Console.Write("{0, 5}  ", sampleArray[i, j]);
                }

                Console.WriteLine();
            }
        }
    }
}