AP Computer Science Principles - Unit 4

Expressions

Expressions

A combination of operators and values that evaluates to a single value.

Assignment Operator

Allows a program to change the value represented by a variable

Variable

A named reference to a value that can be used repeatedly throughout a program

Concatenate

To link together or join. Typically used when joining together text Strings in programming (e.g “Hello, “+name)

String

Any sequence of characters between quotation marks

Boolean Value

A data type that is either true or false

Boolean Expression

in programming, an expression that evaluates to true or false

Comparison (relational) Operators

used to compare two values

Logical Operators

allows you to compare the results of more than one Boolean operation at a time.

Abstraction

a simplified representation of something more complex. allows you to hide details to help manage complexity, focus on relevant concepts, and reason about problems at a higher level.

Function

A named group of programming instructions, reusable abstractions that reduce the complexity of writing and maintaining programs.

Procedure

A named group of programming instructions that may have parameters and return values.

Function Call (to invoke a function)

a command that executes the code within a function

High Level Programming Language

a programming language with many commands and features designed to make common tasks easier to program.

Low Level Programming Language

a programming language that captures only the most primitive operations available to a machine. anything that a computer can do can be represented with combinations.

If-Statement

the common programming structure that implements “conditional statements”

Selection

a generic term for a type of programming statement that uses boolean condition to determine or select whether or not to run a certain block of statements

String

an ordered sequence of characters.