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Here an identity matrix is a square matrix, of size n × n, where the diagonal elements are all 1s, and the other elements are all 0s.

Here is source code of the C# Program to Check If a Given Matrix is an Identity Matrix. The C# program is successfully compiled and executed with Microsoft Visual Studio. The program output is also shown below.

/*
 * C# Program to Check If a Given Matrix is an Identity Matrix
 */
using System;
class pro
{
    public static void Main()
    {
        Console.WriteLine("Enter the order: ");
        int n = int.Parse(Console.ReadLine());
        int[,] a = new int[3, 3];
        int i, j;
        Console.WriteLine("\n Enter the matrix\n");
        for (i = 0; i < n; i++)
        {
            for (j = 0; j < n; j++)
            {
                a[i, j] = Convert.ToInt16(Console.ReadLine());
            }
        }
 
        for (i = 0; i < n; i++)
        {
            for (j = 0; j < n; j++)
            {
                if ((i == j && a[i, j] != 1) || (i != j && a[i, j] != 0))
                {
                    goto label;
                }
            }              
        }
    Console.WriteLine("Identity Matrix");
    return;
label:
    Console.WriteLine("\n Not an Identity Matrix");
    }
}

In this C# program, we are reading the order of the matrix using ‘n’ variable. Using for loop we are entering the elements for matrix. An identity matrix is a square matrix with 1’s along the diagonal from upper left to lower right and 0’s in all other positions.

If condition statement is used to check that the matrix element a[0][0], a[1][1], a[2][2] is one, remaining element values are zero using AND logical operator. If the condition is true, then print the statement as identity matrix. Otherwise, if the condition is false then execute the else statement and print as not identity matrix.

 
Enter the Order : 2
Enter the Matrix :
1
0
0
1
Identity Matrix

C# Program to Check if a Matrix is an Identity Matrix