Splitting up the output of _getchar()

Question

I want to know when an arrow key is pressed. For that I've already found _getchar(). Unfortunately, that returns several values. It returns two different and separated values, even if I save it in one integer.

The first value is always 224, and the second one is the one I need. How can I get it, though?

I tried var[1], but that doesn't work, because it's an integer (didn't know one integer can hold several values).

int posX = 5;
int posY = 10;

while(1)
{

    switch(_getch())
    {
        case 72:
            posY++;
        case 80:
            posY--;
        case 75:
            posX--;
        case 77:
            posX++;
    }

    build(posX, posY); // a function to visualize things, not necessary for my problem
}

Thanks :D