AP COMP SCI A Chapter 2 vocab

variable

variable

a named storage location for values. All variables have a type, which is declared when the variable is created.

value

a number or string (or other thing to be named later) that can be stored in a variable. every value belongs to a type

type

a set of values. the type of a variable determines which values can be stored there. the types we have seen are integers (int in Java) and strings (Strings in Java)

keyword

a reserved word used by the complier to parse programs. You cannot use a keyboard, like public, class, and void as variable names

declaration

a statement that creates a new variable and determines it’s type

assignment

a statement that assigns a value to a variable

expression

a combination of variables, operators, and values that represent a single value. expressions also have types, as determined by their operators and operands.

operator

a symbol that represents a computation like addition, multiplication or string concatention

precedence

the order in which operations are evaluated

concatenate

to join two operands end-to-end

composition

the ability to combine simple expressions and statements into compound statements and expressions to represent complex computations concisely.