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Ch 2 CompSci

TermDefinition
variable a named location in memory that stores a value, which may be numbers, text, images, sounds, and other types of data
value a number, string, or other data that can be stored in a variable
declaration statement that creates a new variable & declares what type it has
type a set of values, determines what kind of values a variable can store
keywords 50 reserved words that can’t be used as variable names bc the compiler uses them to analyze the structure of the program
assignment a statement that gives a value to a variable, update the value
initialized variables assigned for the first time
state the variables in a program & their current values
memory diagrams diagrams that show the state of the program, each variable represented with a box with the name of the variable on the outside and the current value on the inside
operators symbols that represent simple computations
expression a combination of variables, operators, & values that represents a single value to be computed, types determined by operators & operands
operands one of the values that operators work with, most java operators require 2 operands
floating-point a data type that represents numbers with an integer part and a fractional part, the java default type is double
rounding error the difference between the number we want to represent & the nearest floating-point number
concatenate to join two values, often strings end to end
order of operations the rules that determine the order expressions are evaluated, left to right & PEMDAS, also known as operator precedence
compile-time error the program can’t be compiled, error in the source code, occur when the laws of java are violated, syntax error
parsing the process of reading a program before translating, analyze structure of a program
run-time error doesn’t appear til after the program has started running, occur while the interpreter is executing byte code & something goes wrong, an exception
logic error will compile & run without generating error messages, but won’t do the right thing
Created by: kaiello
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