Matrix is identity matrix or not?

Question

write a program to verify whether a given matrix is identity matrix or not?

Hemant Srivastava · Answer

Following code has some more features as... User would be able to matrix of any order, presence of break condition, without using GOTO) using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 { class Program { public static void Main() { Console.WriteLine("Enter the order: "); int n = int.Parse(Console.ReadLine()); int[,] a = new int[n, n]; int i, j; Console.WriteLine("
 Enter the matrix
"); for (i = 0; i { int num = 0; for (j = 0; j { Console.WriteLine("Enter [" + (i+1) + ","+ (j+1) + "] element: " ); if (Int32.TryParse(Console.ReadLine(), out num)) { a[i, j] = num; } } } Console.WriteLine("Entered Matrix is as folowing:
"); for (i = 0; i { for (j = 0; j { Console.Write(a[i, j] + "	"); } Console.WriteLine(); } bool IsIdentity = false; // Iterating all the elements of the given matrix for (i = 0; i { for (j = 0; j { // Each Diagonal element should be 1 and all other elements should be 0 if ((i == j && a[i, j] == 1) || (i != j && a[i, j] == 0)) { IsIdentity = true; } else { IsIdentity = false; break; } } } // After iterating all elemnts of the matrix, checking the IsIdentity flag if (IsIdentity == true) { Console.WriteLine("
It is an Identity Matrix"); } else { Console.WriteLine("
Not an Identity Matrix"); } Console.ReadLine(); } } }

Priyank Khare · Answer

Hi, Following is the program to verify whether a given matrix is identity or not :- using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 { class Program { 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("
 Enter the matrix
"); for (i = 0; i { for (j = 0; j { a[i, j] = Convert.ToInt16(Console.ReadLine()); } } for (i = 0; i { for (j = 0; j { if ((i == j && a[i, j] == 1) || (i != j && a[i, j] == 0)) { goto Message; } else { Console.WriteLine("
 Not an Identity Matrix"); i = j = n; } } } Message: Console.WriteLine("
 It is an Identity Matrix"); Console.ReadLine(); } } }