Write a program that checks whether a matric is an Identity matrix. 

Identity matrix is a square matrix whose main diagonal elements is equal to 1 and other elements are 0.

#include <stdio.h>
#include <conio.h>
#define SIZE 50
void main()
{
	int A[SIZE][SIZE];
	int dim;        /* dimensions */
	int I, J, aux;             
			
	do {
		printf("Number of rows/columns   (max.%d) : ", SIZE);
		scanf("%d", &dim);
	} while (dim <= 0 || dim > SIZE);
 

	printf("*** Matrix ***\n");
	for (I = 0; I<dim; I++)
		for (J = 0; J<dim; J++)
		{
			printf("A[%d][%d] : ", I, J);
			scanf("%d", &A[I][J]);
		}

 

	printf(" Matrix \n");
	for (I = 0; I<dim; I++)
	{
		for (J = 0; J<dim; J++)
			printf("%6d", A[I][J]);
		printf("\n");
	}

	// we loop over the rows
	for (I = 0; I<dim; I++)
	{
		for (J = 0; J<dim; J++)
		{
			if(I==J && A[I][J] !=1)
				break;
			if(I!=J && A[I][J] !=0)
				break;
		}
		if(J<dim)
			break;
	}
	
 	if(I==dim)
		printf(" Identity matrix \n");
	else
		printf(" NOT Identity matrix \n"); 
 

	getch();
}