/*
 * C Program to check if a given matrix is an identity matrix
 */
#include <stdio.h>

void main()
{
    int a[10][10];
    int i, j, row, column, flag = 1;
    printf("Enter the order of the matrix A \n");
    scanf("%d %d", &row, &column);
    printf("Enter the elements of matrix A \n");
    for (i = 0; i < row; i++)
        {
            for (j = 0; j < column; j++)
                {
                    scanf("%d", &a[i][j]);
                }
        }
    printf("MATRIX A is \n");
    for (i = 0; i < row; i++)
        {
            for (j = 0; j < column; j++)
                {
                    printf("%3d", a[i][j]);
                }
            printf("\n");
        }
    /*  Check for unit (or identity) matrix */
    for (i = 0; i < row; i++)
        {
            for (j = 0; j < column; j++)
                {
                    if (a[i][j] != 1 && a[j][i] != 0)
                        {
                            flag = 0;
                            break;
                        }
                }
        }
    if (flag == 1 )
        printf("It is identity matrix \n");
    else
        printf("It is not a identity matrix \n");
}