#include<iostream>
using namespace std;
int main()
{
int mat[5][5], order, i, j, flag = 0;
cout << "Enter size of matrix : ";
cin >> order;
cout << "Enter matrix element : \n";
for (i = 0; i < order; i++)
{
cout << "\n";
for (j = 0; j < order; j++)
{
cin >> mat[i][j];
}
}
for (i = 0; i < order; i++)
{
for (j = 0; j < order; j++)
{
if (i == j)
{
if (mat[i][j] != 1)
{
flag = 1;
break;
}
}
else
{
if (mat[i][j] != 0)
{
flag = 1;
break;
}
}
}
}
cout << "The given matrix is ";
if (flag == 0)
cout << "an identity matrix.\n";
else
cout << "not an identity matrix.\n";
return 0;
}
_______________________________OUPUT______________________________
Enter size of matrix : 3
Enter matrix element :
1 0 0
0 1 0
0 0 1
The given matrix is an identity matrix.
