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" );
}

Output

 Enter the order of the matrix A
 3   3 
Enter the elements of matrix A
 1   2   3 
 5   1   8 
 6   4   1 
MATRIX A is
   1    2    3 
   5    1    8 
   6    4    1 
It is not a identity matrix
 
   
Enter the order of the matrix A
 3   3 
Enter the elements of matrix A
  1   0   0 
  0   1   0 
  0   0   1 
MATRIX A is
   1    0    0 
   0    1    0 
   0    0    1 
It is identity matrix

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