/*
find out if neighbours are on or off
add up the number of neighbours that are on
*/
neighbours(int grid[x][y])
{
  int alive, dead, i, j;
  alive = dead = 0;
  for(j=y-1; j<=y+1; j++)
  {
    for(i=x-1; i<=x+1; i++)
    {
      if(i != miny && grid[i][j]==on)
        alive = alive+1;
      else
        dead = dead+1;
    }
    if(i != minx && grid[i][j]==on)
      alive = alive+1;
    else
      dead = dead+1;
  }
  return(alive);
}