Table of ContentsDate(s) Title/Topic Page #s

9/11 2.4 Primitive Data Types, 2.5 Arithmetic Expressions

36-37

Set up p. 36 for HW and p. 37

for Cornell notes

36 37

HW

2.4 Primitive Data Types,

2.5 Arithmetic ExpressionsAP Test Questions

APTestQuestionFriday

Primitive DataThere are exactly eight primitive data types in JavaFour of them represent integers:> byte, short, int, long

Two of them represent floating point numbers:> float, double

One of them represents characters:> char

And one of them represents boolean values:> boolean

Only three are in the AP subset: int, double, and boolean

Numeric Primitive Data

BooleanA boolean value represents a true or

false conditionA boolean also can be used to represent any two states, such as a light bulb being on or offThe reserved words true and false

are the only valid values for a boolean type

boolean done = false;

CharactersA char variable stores a single character from

the Unicode character setA character set is an ordered list of characters, and each character corresponds to a unique numberThe Unicode character set uses sixteen bits per character, allowing for 65,536 unique charactersIt is an international character set, containing symbols and characters from many world languagesCharacter literals are delimited by single quotes:

'a' 'X' '7' '$' ',' '\n'

Characters

p. 37

primitive

data types

there are 8 but only 3 on

AP test (int, double, boolean)

2.4 Primitive Data Types,

2.5 Arithmetic Expressions

integer

floating point

(aka decimal)

true or

false

Division and Remainder

Operator PrecedenceOperators can be combined into complex expressions

result = total + count / max - offset;

Operators have a well-defined precedence which determines the order in which they are evaluatedMultiplication, division, and remainder are evaluated prior to addition, subtraction, and string concatenationArithmetic operators with the same precedence are evaluated from left to rightParentheses can be used to force the evaluation order

Operator Precedence

Assignment Revisited

Assignment Revisited

p. 37

remainder

operator

also known as modulus

% symbol

2.4 Primitive Data Types,

2.5 Arithmetic Expressions

ex: 17%4

division

examples10/4 10.0/4 10/4.0

p. 37

operator

precedence

hierarchy

*, /, and % are performed

before + and -

done left to right

you can use parentheses to

change the order

2.4 Primitive Data Types,

2.5 Arithmetic Expressions

APTestQuestionFriday

HW - p. 106 Self-Review 2.12, 2.13

p. 107 Mult Choice 2.1-2.5 do on p. 36 in NB

Summary - at bottom of p. 37

Why are the answers to 5/2 and

5.0/2 different?

Chapter2–Lab1

NamesandPlaces

ATableofStudentGrades

*due next Wednesday

*turn both .java files in

on Google Classroom