int array[10][10];
int neighbour[3] = {-1, 0, 1};

for(int x = 0; x < 10; ++x)
{
    for(int y = 0; y < 10; ++y)
    {
        for(int i = 0; i < 3; ++i)
        {
            for(int j = 0; j < 3; ++j)
            {
                 if(x + neighbour[i] > 0 && x + neighbour[i] < 10 && y + neighbour[j] > 0 && y + neighbour[j] < 10)
                     doSomething(x+neighbour[i], y+neighbour[j]);
            }
        }
    }
}