Java Chapter 2

Front 1

In the java program use variables for what?

Back 1

To stare values.

Front 2

Int cansPerPack = 6; is a reference to what?

Back 2

Declares a variable named cans PerPack:

Front 3

Variable

Back 3

A symbol in a program that identifies a storage location that can hold different values

Front 4

When declaring a variable, you usually want?

Back 4

to initialize it

Front 5

Initialization

Back 5

Setting a variable to well-defined value when it is created.

Front 6

Type

Back 6

A named set values and the operations that can be carried out with them.

Front 7

Integer

Back 7

A number that cannot have a fractional part.

Front 8

int cans = 6; is what in english

Back 8

Declares an integer variable and initializes it with 6

Front 9

int total = cans + bottles; is what in english

Back 9

The inital value need not be fixed value. (of course, cans and bottles must have been previously declared.

Front 10

bottles = 1; is an error, why>

Back 10

The type is missing. This statementis not a declaration but an assignment of a new value to an existing variable

Front 11

Int volume = "2" ; is an error, why?

Back 11

You cannot initialize a number with a string

Front 12

int cansPerPack; is what in english

Back 12

Declares an integer variable without initializing it. This can be a cause for errors.

Front 13

int dollars, cents; is what type of englsih

Back 13

Declares two integer variables in a single statement.

Front 14

You use the int type to>

Back 14

denote a whole number without a fractional part.

Front 15

Floating-point number

Back 15

A number that can have a fractional part

Front 16

double is what in Java?

Back 16

we use this for floating - point numbers.

Front 17

double canVolume = 0.335; is what?

Back 17

its a floating - point variable

Front 18

Number literal

Back 18

A constant value in a program this is explicitly written as a number, such as -2 or 6.02214115E23

Front 19

Rules with variables

Back 19

Name must start with a letter or underscore (_) character, and the remaining characters must be letters, numbers, or underscores.

Front 20

Camel case

Back 20

The uppercase letters in the middle of the name look like the humps of a camel.

Front 21

Case sensitive

Back 21

Distinguishing upper - and lowercase characters.

Front 22

Reserved word

Back 22

A word that has a special meaning in a programming language and therefore cannot be used as a name by the programmer.

Front 23

Variable names should start with?

Back 23

a lowercase letter.

Front 24

Class names should start with?

Back 24

an uppercase letter

Front 25

Can variables have spaces?

Back 25

No

Front 26

Assignment

Back 26

Placing a new value into a variable

Front 27

When a variable is defined with the reserved word final, what does that mean?

Back 27

its value can never change.

Front 28

Constants are commonly written?

Back 28

Using capital letter to distinguish them visually from regular vriables

Front 29

Comment

Back 29

An explanation to help the human reader understand a section of a program; ignored by the compiler

Front 30

// is used for?

Back 30

delimiter fro short comments

Front 31

*/ and /* is used for

Back 31

they are in closed for large comments

Front 32

/** is used for?

Back 32

Start a comment that explains the purposes of a program

Front 33

Declare a variable suitable for holding a the number of bottles inc ase.

Back 33

int bottlesPerCase = 8;

it can have any variable name or a different initialization value but your variable should have type int.

Front 34

What is wrong with the following variable declaration?

int ounces per liter = 28.35

Back 34

You cannot have spaces in variable names

the variable type should be double instead of int because it holds a fraction value

there is a semicolon missing at the end of the statement

Front 35

Use the variables declared in self check 3 to display the total purchase price

Back 35

System.out.print("Total price: ");

System.out.println(unitPrice * quantity);

Front 36

Some drinks are sold in four - packs instead of six - packs. How would you change the Volume1.java program to compute the total volume?

Back 36

change the declaration of canPerPack to

int cansPerPack = 4;

Front 37

What is wrong with this comment?

double canVolume = 0.355; /* Liters in a 12-ounce can //

Back 37

You need to use a */ delimiter to close a comment that begins with a /*:

double canVolume = 0.355;

/* Liters in a 12-ounce can */

Front 38

Suppose the type of the cansPerPack variable in Volume1.java was changed from int to double. What would be the effect on the program?

Back 38

The program would compile, and it would display the same result. However, a -person reading the program might find it confusing that fractional cans are being considered.

Front 39

Why can't the variable totalVolume in the Volume1.java program be declared as final?

Back 39

Its value is modified by the assignment statement.

Front 40

How would you explain assignment using the parking space analogy?

Back 40

Assignment would occur when one car is replaced by another in the parking space.

Front 41

Expression

Back 41

A syntactical construct that is made up constants, variables, method calls, and the operators combining them.

Front 42

++ operator adds?

Back 42

1 to a variable

Front 43

-- operator

Back 43

subtracts 1 from the variable

Front 44

7/4 in Java will do what?

Back 44

it will be evaluated to 1 because 7 divided by 4 is 1 with a remainder of 3. This is a programming error.

Front 45

division in Java should only use numbers?

Back 45

That are fraction base numbers such as

7.0/4.0

7/4.0

7.0/4

Front 46

% symbol is used for?

Back 46

remainder only such as

7 % 4

Front 47

Modulus

Back 47

The % operator that computes the remainder of an integer division

Front 48

Modulus

Back 48

The % operator that computes the remainder of an integer division

Front 49

Call method

Back 49

Is used to take the square root of a number and powers

Front 50

Math.sqrt(x) is used for what?

Back 50

Squared root of a number

Front 51

Math.pow(x, n) is used for what?

Back 51

The power root

Front 52

b*(1+r/100)^n how is it written in linear arrangement

Back 52

b * Math.pow(1 + r / 100, n)

Front 53

Cast

Back 53

Explicitly converting a value from one type to a different type. For example, the cast from a floating-point number x to an integer is expressed in Java by the cast notation (int) x