C# .Net Matrix Multiplication Program 

Matrix multiplication program Logic:

• First we declare two integer variable m and n to store the matrix dimensions entered by user
• Declare three two dimensional arrays to store matrix A, matrix B and matrix C
• Read matrix A using for loop and store it in array matrix a[m,n]
• Read matrix B using for loop and store it in array matrix b[m,n]
• Perform sum of matrix A and matrix B   using for loop and store it in array matrix c[m,n].
• using  c[i, j] += a[i, k] * b[k, j];
• show content of matrix a , 
• show content of matrix b and 
• show content matrix c as multiplication of matrix a and matrix b

Matrix multiplication program Sourcecode

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace MatrixMultiplicationProgram
{
    class Program
    {
        static void Main(string[] args)
        {
            
            int i, j,m,n;
            Console.WriteLine("Enter the Number of Rows and Columns : ");
            m = Convert.ToInt32(Console.ReadLine());
            n = Convert.ToInt32(Console.ReadLine());
            int[,] a = new int[m, n];
            Console.WriteLine("Enter the First Matrix");
            for (i = 0; i < m; i++)
            {
                for (j = 0; j < n; j++)
                {
                    a[i, j] = int.Parse(Console.ReadLine());
                }
            }
            int[,] b = new int[m, n];
            Console.WriteLine("Enter the Second Matrix");
            for (i = 0; i < m; i++)
            {
                for (j = 0; j < n; j++)
                {
                    b[i, j] = int.Parse(Console.ReadLine());
                }
            }

            Console.WriteLine("First matrix is:");
            for (i = 0; i < m; i++)
            {
                for (j = 0; j < n; j++)
                {
                    Console.Write(a[i, j] + "\t");
                }
                Console.WriteLine();
            }
            
            Console.WriteLine("Second Matrix is :");
            for (i = 0; i < 2; i++)
            {
                for (j = 0; j < 2; j++)
                {
                    Console.Write(b[i, j] + "\t");
                }
                Console.WriteLine();
            }
            Console.WriteLine("Matrix Multiplication is :");
            int[,] c = new int[m, n];
            for (i = 0; i < m; i++)
            {
                for (j = 0; j < n; j++)
                {
                    c[i, j] = 0;
                    for (int k = 0; k < 2; k++)
                    {
                        c[i, j] += a[i, k] * b[k, j];
                    }
                }
            }
            for (i = 0; i < m; i++)
            {
                for (j = 0; j < n; j++)
                {
                    Console.Write(c[i, j] + "\t");
                }
                Console.WriteLine();
            }
 
            Console.ReadKey();
        }
        }
    }

Matrix Multiplication Program Output:

Enter the Number of Rows and Columns :
2
2
Enter the First Matrix
2
2
2
2
Enter the Second Matrix
2
2
2
2
First matrix is:
2       2
2       2
Second Matrix is :
2       2
2       2
Matrix Multiplication is :
8       8
8       8