#define X_SIZE 60
#define Y_SIZE 30
int main()
{
int matrix[X_SIZE][Y_SIZE];
int x,y; /* current element to zero */
for (x = 0; x < X_SIZE; ++x) {
for (y = 0; y < Y_SIZE; ++y) {
matrix[x][y] = -1;
}
}
return (0);
}