APCSP Unit 3

User Interface

The inputs and outputs that allow a user to interact with a piece of software. It can include buttons, text boxes, images, sliders, etc.

Input

A way for users to provide data or control to a program. Examples: typing text, clicking a button, touching the screen.

Output

Any way a program presents information back to the user — text, sound, images, vibration, etc.

Program

A collection of program statements that perform a specific task when executed by a computer.

Event

An action or occurrence (like a mouse click or key press) that triggers part of a program to run.

Event-Driven Programming

A programming approach where the flow of the program is determined by user actions (events).

Event Handler

A block of code that runs in response to a specific event.

User Interface (UI) Components

Visual elements (buttons, labels, text boxes) that make up the UI and allow user interaction.

Program Input

Data or signals received by a program, often from a user or another system.

Program Output

Information a program sends out, often to a display screen or speaker.

Program Statement

A single command or line of code that performs an action in a program.

Program Behavior

How a program functions when it runs — what it does in response to inputs and events.

Program Development

The overall process of designing, writing, testing, and refining a program.

Program Development Process

An iterative process involving designing, coding, testing, and debugging until the program works as intended.

Collaboration

Working with others to design, write, and test software, sharing ideas and dividing work.

Incremental Development

Building a program step-by-step, testing each new part before moving on.

Iterative Development

A cyclic process of designing, prototyping, and testing repeatedly to improve a program.

Debugging

Finding and fixing errors (bugs) in code.

Syntax Error

A mistake in how code is written that breaks the language’s rules (for example, missing a semicolon or parenthesis).

Logic Error

A mistake in a program’s logic that makes it behave incorrectly even though it runs without crashing.

Design Process

A structured approach to creating a solution, including brainstorming, planning, building, and testing.

Prototype

A preliminary version of an app or program used to test ideas and get feedback.

Algorithm

A precise sequence of instructions for solving a problem or completing a task.

Function

A named group of statements that together perform a specific task and can be reused.

Software

A program or collection of programs that tell a computer what to do.