C++ Program To Check if Two Matrices are Identical

Last Updated : 17 Jan, 2023

The below program checks if two square matrices of size 4*4 are identical or not. For any two matrices to be equal, the number of rows and columns in both the matrix should be equal and the corresponding elements should also be equal.

C++

// C++ Program to check if two 
// given matrices are identical 
#include <bits/stdc++.h> 
#define N 4 
using namespace std; 
  
// This function returns 1 if A[][]  
// and B[][] are identical otherwise  
// returns 0 
int areSame(int A[][N], int B[][N]) 
{ 
    int i, j; 
    for (i = 0; i < N; i++) 
        for (j = 0; j < N; j++) 
            if (A[i][j] != B[i][j]) 
                return 0; 
    return 1; 
} 
  
int main() 
{ 
    int A[N][N] = {{1, 1, 1, 1}, 
                   {2, 2, 2, 2}, 
                   {3, 3, 3, 3}, 
                   {4, 4, 4, 4}}; 
  
    int B[N][N] = {{1, 1, 1, 1}, 
                   {2, 2, 2, 2}, 
                   {3, 3, 3, 3}, 
                   {4, 4, 4, 4}}; 
  
    if (areSame(A, B)) 
        cout << "Matrices are identical"; 
    else
        cout << "Matrices are not identical"; 
    return 0; 
} 

Output:

Matrices are identical

The program can be extended for rectangular matrices. The following post can be useful for extending this program.
How to pass a 2D array as a parameter in C?
The time complexity of the above program is O(n²).

The auxiliary space of the above program is O(1).

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