Discontinuity of a function: A function f(x) is continuous at a point x = a when the left hand limit and right hand limit of f(x) at x =a equals the functional value f(a). The points at which this...
the arrow keys or some other combination are actually a D-pad or joystick with an X and Y axis, and 1 or 2 fire buttons. Gamepad handles the event capture, maths and other details of this for you, so you only have to think about how you want your game to respond to this input. ...