Why doesn't this work - about tables

Hi, I'm writing a small game, now figuring how to set up the game board. This code creates an area in which the game will be played.. Now, when I change the X or Y it shows no error, though when I run it an exception is generated. I guess it's something to do with referring outside my table, but can't see it.

So, here's the code:

Code:

---

#include <stdio.h>
#define X 20
#define Y 20


int main (void)
{
        char table [X][Y] = {' '};
        int i, j;
       
        for (i=0;i<Y;i++)
        {
                table[0][i] = 'O';
        }
        for (i=0;i<Y;i++)
        {
                table[Y-1][i] = 'O';
        }
        for (i=0;i<X;i++)
        {
                table[i][0] = 'O';
        }
        for (i=0;i<X;i++)
        {
                table[i][X-1] = 'O';
        }


        for (i=0;i<Y;i++)
        {
                for (j=0;j<X;j++)
                {
                        printf("%c", table[i][j]);
                }
                printf("\n");
        }

        return 0;
}

---

the tables are constructed:

int table[Y][X];

if I'm not mistaken. Not table[X][Y]. Was it when you changed them so that they're different? It's a bounds error then.

Ok, so the first array is for vertical movement, the other for horizontal? Ok, thanks a lot.