AP CompSci Principles (Unit 3)

User Interface

the inputs and outputs that allow a user to interact with a piece of software. User interfaces can include a variety of forms such as buttons, menus, images, text, and graphics

Input

data that is sent to a computer for processing by a program. Can come in a variety of forms, such as tactile interaction, audio, visuals, or text

Output

any data that is sent from a program to a device. Can come in a variety of forms, such as tactile interaction, audio, visuals, or text

Program Statement

a command or instruction

sometimes also referred to as a code statement

Program

a collection of program statements

programs run (or “execute”) one command at a time

Sequential Programming

program statements run in order

from top to bottom

• no user interaction

• code runs the same way every time

Event Driven Programming

some program statements run when triggered by an event, like a mouse click or a key press

• programs run differently each time depending on user interactions