Comp Sci Unit 4

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, texts, and graphics

Input

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

Statement 

A single line code that instructs the program to do something. Almost every line of code is a statement

Sequence/Sequential programming

The quality executing statements by line in a predetermined order from top to bottom. 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 based on user interactions

Program statement 

A command or instruction. Sometimes also referred to as code statement

Program

A collection of program statements. Programs run (or “execute”) one command at a time

Event

A moment of input between the program and something else (generally the user)

Event listener

A small program that “listens” for a specific event to happen. When this event happens, a specific sequence of statements (function) are executed

Debugging 

The process of finding and fixing problems in code 

Documentation

A written description of how a command or piece of code works or was developed

Comment

Form of program documentation written into the program to be read by people and which do not affect how a program runs

String

A sequence of symbols

Integer

A whole number

Variable

A slot of computer memory that holds (at most) one value at a time

Data types

The categories of data a computer can save, along with the rules that apply to those categories. Numbers and strings are 2 types of data.

Assignment

The act of associating a variable with a piece of data

Operator

A symbol that represents some kind of mathematical or logical operation. Essentially just a fancy name for + - * /

Expression

Combination of operators and values that evaluates to single value

Assignment operator

A special symbol for a coding language that associates a variable with a piece of data

Declaration

The act of creating a variable, not the same as assigning it

Syntax

The strict structure and set of rules a coding language requires

Concatenation

Joining a number or string together with another string using the “+” operator

Scope

The boundaries in which some element of code—such as a variable—is usable. Different scopes are usually (not always) separated by curly braces

Global variable

A permanent variable that is declared in the global scope (outside of any specific boundary). It can be used anywhere in your code

Local variable

A temporary variable that can be used only in the scope in which it was declared like inside an onEvent listener (deleted once the onEvent is done running)