How to perform Matrix Addition using C#?

To perform matrix addition, take two matrices. Enter the rows and columns of matrix one and matrix two. Remember, both the matrix should be a square matrix to add them.

Now add elements to both the matrices. Declare a new array and add both the arrays in it.

arr3[i, j] = arr1[i, j] + arr2[i, j];

Let us see the complete code −

Example

using System;
using System.Linq;

class Demo {

   static void Main() {

      int m, n, i, j;
   
      Console.Write("Enter number of rows and columns of the matrix ");
      m = Convert.ToInt16(Console.ReadLine());
      n = Convert.ToInt16(Console.ReadLine());

      int[,] arr1 = new int[10, 10];
      int[,] arr2 = new int[10, 10];
      int[,] arr3 = new int[10, 10];

      Console.Write("Enter elements - Matrix 1 : ");
      for (i = 0; i < m; i++) {
         for (j = 0; j < n; j++) {
            arr1[i, j] = Convert.ToInt16(Console.ReadLine());
         }
      }

      Console.Write("Enter elements - Matrix 2 : ");
      for (i = 0; i < m; i++) {
         for (j = 0; j < n; j++) {
            arr2[i, j] = Convert.ToInt16(Console.ReadLine());
         }  
      }

      Console.WriteLine("Matrix 1 ");
      for (i = 0; i < m; i++) {
         for (j = 0; j < n; j++) {
            Console.Write(arr1[i, j] + "\t");
         }
         Console.WriteLine();
      }

      Console.WriteLine("Matrix 2 ");
      for (i = 0; i < m; i++) {
         for (j = 0; j < n; j++) {
            Console.Write(arr2[i, j] + "\t");
         }
         Console.WriteLine();
      }

      for (i = 0; i < m; i++) {
         for (j = 0; j < n; j++) {
            arr3[i, j] = arr1[i, j] + arr2[i, j];
         }
         Console.WriteLine();
      }

      Console.WriteLine("Matrix Addition ");
      for (i = 0; i < m; i++) {
         for (j = 0; j < n; j++) {
            Console.Write(arr3[i, j] + "\t");
         }
         Console.WriteLine();
      }

      Console.ReadLine();
   }
}

Output

The following is the output.

Enter number of rows and columns of the matrix 3 3
Enter elements - Matrix 1 : 1 2 3 4 5 6 7 8 9
Enter elements - Matrix 2 : 1 2 3 4 5 6 7 8 9
Matrix 1
123
456
789

Matrix 2
123
456
789

Matrix Addition
246
81012
141618