Why does this code crash?

Question

The following code causes a stack overflow but I don't see why...

int _tmain(int argc, _TCHAR* argv[])
{
    cout << "start";
    char bmp[1024][768][3];
for (int p = 0; p < 9000; ++p)
{
    for(int i = 0; i < 1024; ++i)
    {
        for(int j = 0; j < 768; ++j)
        {
            bmp[i][j][0] = 20;
        }

    }
}

cout << "Stop";


    return 0;
}

Thanks

Answer 1

I would say it is likely because 1024 * 768 * 3 is 2,359,296 which is probably too big for the local stack.

You should instead allocate that on the heap.

Answer 2

Allocating the int array crashes since it's bigger than the default Windows stack. Try changing it's size and you'll see that it crashes no more.