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- A named storage location for values. All variables have a type, which is declared when the variable is created.
- A number, string, or other data that can be stored in a variable. Every value belongs to a type (for example,
- A statement that creates a new variable and specifies its type.
- Mathematically speaking, a set of values. The type of a variable determines which values it can have.
- The structure of a program; the arrangement of the words and symbols it contains.
- A reserved word used by the compiler to analyze programs. You cannot use keywords (like
void) as variable names.
- A statement that gives a value to a variable.
- To assign a variable for the first time.
- 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.
- A symbol that represents a computation like addition, multiplication, or string concatenation.
- One of the values on which an operator operates. Most operators in Java require two operands.
- A combination of variables, operators, and values that represents a single value. Expressions also have types, as determined by their operators and operands.
- A data type that represents numbers with an integer part and a fractional part. In Java, the default floating-point type is
- rounding error:
- The difference between the number we want to represent and the nearest floating-point number.
- To join two values, often strings, end-to-end.
- order of operations:
- The rules that determine in what order operations are evaluated.
- 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”.
- 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.