Need help turning this if sequence into a switch case

How do you turn this....

Code:

//macros to read the keyboard asynchronously
#define KEY_DOWN(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0)
#define KEY_UP(vk_code)((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0)

	if (KEY_DOWN(VK_RIGHT))
	{
		right = right + 1;
		left = left + 1;
	}
	if (KEY_DOWN(VK_LEFT))
	{	
		right = right -1;
		left = left - 1;
	}
	if (KEY_DOWN(VK_UP))
	{
		top = top - 1;
		bottom = bottom - 1;
	}
	if (KEY_DOWN(VK_DOWN))
	{
		bottom = bottom + 1;
		top = top + 1;
	}

into a switch statment....

This was my attempt at it but I could not figure out the whole call to KEY_DOWN aspect

Code:

	switch (KEY_DOWN())
	{
	case VK_RIGHT;
		right = right + 1;
		left = left + 1;
		break;
	case VK_LEFT;
		right = right -1;
		left = left - 1;
		break;
	case VK_UP;
		top = top - 1;
		bottom = bottom - 1;
		break;
	case VK_DOWN;
		bottom = bottom + 1;
		top = top + 1;
		break;
	default:
		break;
	}

this is just a wild guess, but have you tried finding out the return type of KEY_DOWN? in your if statements you have KEY_DOWN(VK_UP) and so on, they don't return those values do they?