10.11: Vocabulary

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variable:: A named storage location for values. All variables have a type, which is declared when the variable is created.
value:: A number, string, or other data that can be stored in a variable. Every value belongs to a type (for example, int or String).
declaration:: A statement that creates a new variable and specifies its type.
type:: Mathematically speaking, a set of values. The type of a variable determines which values it can have.
syntax:: The structure of a program; the arrangement of the words and symbols it contains.
keyword:: A reserved word used by the compiler to analyze programs. You cannot use keywords (like public, class, and void) as variable names.
assignment:: A statement that gives a value to a variable.
initialize:: To assign a variable for the first time.
state:: The variables in a program and their current values.
state diagram:: A graphical representation of the state of a program at a point in time.
operator:: A symbol that represents a computation like addition, multiplication, or string concatenation.
operand:: One of the values on which an operator operates. Most operators in Java require two operands.
expression:: A combination of variables, operators, and values that represents a single value. Expressions also have types, as determined by their operators and operands.
floating-point:: A data type that represents numbers with an integer part and a fractional part. In Java, the default floating-point type is double.
rounding error:: The difference between the number we want to represent and the nearest floating-point number.
concatenate:: To join two values, often strings, end-to-end.
order of operations:: The rules that determine in what order operations are evaluated.
composition:: The ability to combine simple expressions and statements into compound expressions and statements.
compile-time error:: An error in the source code that makes it impossible to compile. Also called a “syntax error”.
parse:: To analyze the structure of a program; what the compiler does first.
run-time error:: An error in a program that makes it impossible to run to completion. Also called an “exception”.
logic error:: An error in a program that makes it do something other than what the programmer intended.