#include <stdio.h>

#define N 32


void initSquare(int);
int createSquare(int, int, int);
void displaySquare(int);

int square[N][N];

main()
{
	
	int order;
	
	while(1) {
		printf("Give an odd n: ");
		scanf("%d", &order);
		if (order % 2 != 0)
			break;
	}

	createSquare(0,0,order);

	displaySquare(order);


}

/* 
 * Δημιουργεί ένα μαγικό τετράγωνο περιττής τάξης, n, ξεκινώντας από
 * το στοιχείο x,y του πίνακα squares.
 */

int createSquare(int x, int y, int n)
{
	int i,j, counter, numOfSquares;
	int Inew, Jnew;
	
	if (x >= n || y >= n)
		return -1;
	
	if (n % 2 == 0)
		return -1;
	
	initSquare(n);

	i = x; j = y;

	numOfSquares = n * n;
	
	for (counter = 1; counter <= numOfSquares; counter++){
		
		Inew = (i + 1) % n;
	        Jnew = (j + 1) % n;
		
		if (square[Inew][Jnew] != 0) {

			Inew = (i - 1 + n) % n;
			
		/* Εναλλακτικά
			Inew = i - 1;
			
			if (Inew == -1) 
				Inew = n - 1;
		*/	
			Jnew = j;
		
		}
		
		square[Inew][Jnew] = counter;
		i = Inew;
		j = Jnew;
	}
		
	return 0;
}

void initSquare(int n)
{
	int i,j;

	for (i=0; i < n; i++)
		for (j = 0; j < n; j++)
			square[i][j] = 0;
}
	
void displaySquare(int n)
{
	int i,j;

	for (i = 0; i < n; i++) {
		for (j = 0; j < n; j++)
			printf("%3d ", square[i][j]);
		printf("\n");
	}
}