Chapter 2

Question 1

Algorithm

Answer 1

lists the steps you can follow to solve a problem. They can help the programmer plan a program before writing it in a programming language.

Question 2

Pseudocode

Answer 2

natural language mixed with some programming code

Question 3

Main method

Answer 3

where program execution begins

Question 4

Variable

Answer 4

A variable represents a value stored in the computer’s memory

Question 5

Data types

Answer 5

the kind of data stored in a variable

Question 6

Declaring variables

Answer 6

Defines a variable with a data type.

Question 7

Primitive data types

Answer 7

or fundamental types. simple data types for representing integers, real numbers, characters, and Boolean types. (Byte, short,int, long,float,double,boolean,char).

Question 8

Floating-point

Answer 8

How Real numbers (i.e., numbers with a decimal point) are represented.

Question 9

Floating-point numbers

Answer 9

Real numbers.

you can use the keyword double to declare a floating-point variable.

Question 10

Every Variable has..

Answer 10

Every variable has a name, a type, and a value

Question 11

Tracing a program

Answer 11

reviewing how a program works. They are are helpful for understanding how programs work, and they are useful tools for finding errors in programs.

Question 12

The value of a variable is..

Answer 12

not defined until you assign a value.

Question 13

The plus sign (+) has two meanings:

Answer 13

for addition, and for concatenating (combining) strings

Question 14

System.out to refers to

Answer 14

the standard output device

Question 15

System.in refers to

Answer 15

the standard input device.

Question 16

An output device is

Answer 16

is the display monitor

Question 17

An input device is

Answer 17

is the keyboard.

Question 18

To perform console output, you simply use

Answer 18

the println method to display a primitive value or a string to the console.

Question 19

To perform console input, you need to use the

Answer 19

Scanner class to create an object to read input from System.in

Question 20

Prompt

Answer 20

directs the user to enter an input

Question 21

There are 2 types of import statements

Answer 21

specific import and wildcard import.

Question 22

Specific import

Answer 22

specifies a single class in the import statement.

Question 23

Wildcard import

Answer 23

imports all the classes in a package by using the asterisk as the wildcard

Question 24

There is no performance difference between a specific import and a wildcard import declaration.

Answer 24

True.

Question 25

The information for the classes in an imported package is not read in at compile time or runtime unless the class is used in the program.

Answer 25

True

Question 26

The import statement simply tells the compiler where to locate the classes.

Answer 26

True

Question 27

Input is receiving input from the user; process is producing results using the input; and output is displaying the results.

Answer 27

True

Question 28

Identifier

Answer 28

A name of a variable, method, class, interface, or package

Question 29

An identifier is a sequence of characters that consists of letters, digits, underscores (_), and dollar signs ($)

Answer 29

True

Question 30

An identifier must start with a letter, an underscore (_), or a dollar sign ($). It cannot start with a digit.

Answer 30

True

Question 31

An identifier cannot be a reserved or Keyword.

Answer 31

True

Question 32

An identifier can be of any length.

Answer 32

True

Question 33

$2, ComputeArea, area, radius, and print are legal identifiers

Answer 33

True

Question 34

Do not name identifiers with the $ character. By convention, the $ character should be used only in mechanically generated source code.

Answer 34

True

Question 35

Every letter in a Java keyword is in lowercase

Answer 35

True

Question 36

Variable values can be changed

Answer 36

True

Question 37

The variable declaration tells

Answer 37

the compiler to allocate appropriate memory space for the variable based on its data type.

Question 38

If variables are of the same type, they can be declared together

Answer 38

True

Question 39

Scope of a variable

Answer 39

the part of the program where the variable can be referenced.

Question 40

Variable must be declared and initialized before it can be used.

Answer 40

True

Question 41

The equal sign (=) is

Answer 41

the assignment operator

Question 42

An expression

Answer 42

is a computation involving values, variables, and operators that, evaluates to a value

Question 43

A constant is

Answer 43

represents permanent data that never changes.

Question 44

A constant must be declared and initialized in the same statement.

Answer 44

True

Question 45

The word final is a Java keyword for declaring a constant.

Answer 45

True

Question 46

Use lowercase for variables and methods

Answer 46

True

Question 47

Capitalize the first letter of each word in a class name

Answer 47

True

Question 48

Capitalize every letter in a constant, and use underscores between words

Answer 48

True

Question 49

Double is known as

Answer 49

double precision

Question 50

Float is known as

Answer 50

single precision

Question 51

Operands

Answer 51

are the values operated by an operator

Question 52

A unary operator has only

Answer 52

one operand

Question 53

a binary operator has only

Answer 53

two operand

Question 54

The Math.pow(a, b) method can be used to compute

Answer 54

ab.