This is a flow chart representing a simplified process in which a video game does in order to operate properly. Inputs are what the user/player uses to interact with the game (mouse,

keyboard, controller) and Outputs are how the program provides feedback to the user/player (display, speakers)

Here is the simplified process of moving the paddle down in the game Pong.

Here are some of the possible INPUTS, UPDATES and OUTPUTS in the game Pong.

How a game works: Pong

PROGRAM

INPUT

UPDATE

OUTPUT

PONG

DOWN KEY

CHANGE STATE

MOVE PADDLE DOWN

DOWN KEY

UP KEY

CHANGE PADDLE STATE

CHANGE BALL STATE

CHANGE SCORE STATE

MOVE PADDLE DOWN

MOVE PADDLE UP

BALL VELOCITY CHANGES

SCORE CHANGES