COP2253 Zybooks Chapter Two

Question 1

variable

Answer 1

a named item used to hold a value

Question 2

assignment

Answer 2

assigns a variable with a value

Question 3

an assignments left side must be a

Answer 3

variable

Question 4

= symbol is

Answer 4

an assignment of a left-side variable with a right-side value (NOT equality as in mathematics)

Question 5

incrementing

Answer 5

increasing a variables value by 1

Question 6

variable declaration

Answer 6

a statement that declares a variable, specifying the variable’s name and type

Question 7

assignment statement

Answer 7

a statement that assigns the variable on the left-side of the = with the current value of the right-side expression

Question 8

expression

Answer 8

a combination of items, like variables, literals, operators, and parentheses, that evaluates to a value

Question 9

an integer appearing in an expression is known as an

Answer 9

integer literal

Question 10

identifier

Answer 10

a case-sensitive name created by a programmer for an item like a variable or method

Question 11

reserved word (or keyword)

Answer 11

a word that is part of the language that cannot be used as an identifier

Question 12

camel case

Answer 12

abuts multiple words, capitalizing each word except the first

Question 13

literal

Answer 13

a specific value in code

Question 14

operator

Answer 14

a symbol that performs a built-in calculation (like +-*/)

Question 15

when an expression evaluates to a value it

Answer 15

replaces the expression

Question 16

precedence rules

Answer 16

in order:

unary -
*/%
+-
left-to-right
~~~

```

Question 17

unary minus -

Answer 17

minus used as a negative

Question 18

compound variables

Answer 18

shorthand way to update a variable (ex. +=)

Question 19

Should you include commas in an integer literal?

Answer 19

NO

Question 20

floating-point number

Answer 20

a real number containing a decimal point that can appear anywhere (or “float”) in the number

Question 21

double variable

Answer 21

stores a floating-point number

Question 22

floating-point literal

Answer 22

a number with a fractional part, even if the fraction is 0 as in 1.0

Question 23

What statement reads a floating-point value from input?

Answer 23

scnr.nextDouble();

Question 24

Integer variables are typically used for values that are___?

Answer 24

counted

Question 25

floating-point variables are typically used for values that are ___?

Answer 25

measured

Question 26

Dividing a non-zero floating-point number by zero results in:

Answer 26

infinity or -infinity

Question 27

NaN indicates:

Answer 27

(not a number) an unrepresentable or undefined value

Question 28

scientific notation

Answer 28

written as e preceding the power-of-10 exponent, as in 6.02e33

Question 29

constant variable (or final variable)

Answer 29

an initialized variable whose value cannot be changed, usually named in uppercase and separated by underscores. variable declaration is preceded with keyword final

Question 30

method

Answer 30

a list of statements executed by invoking the method’s name (via method call)

Question 31

arguments

Answer 31

method input values, appear within (), separated by commas

Question 32

modulo operator

Answer 32

%, evaluates the remainder of the division of two integer operands

Question 33

type conversion

Answer 33

a conversion of one data type to another

Question 34

implicit conversion

Answer 34

automatic type conversion

Question 35

type cast (type)

Answer 35

explicitly converts a value of one type to another type (ex. (double)myIntVar)

Question 36

variable char type

Answer 36

stores a single character

Question 37

character literal

Answer 37

character surrounded with single quotes, as in ‘k’

Question 38

What statement reads a character from input?

Answer 38

scnr.next().charAt(0);

Question 39

string

Answer 39

sequence of characters

Question 40

string literal

Answer 40

surrounds a character sequence with double quotes

Question 41

object

Answer 41

consists of some internal data items plus operations that can be performed on that data

Question 42

scnr.next()

Answer 42

reads a string from input until reaching a whitespace

Question 43

What statement reads all of the text on the current input line?

Answer 43

scnr.nextLine()

Question 44

overflow

Answer 44

occurs when the value being assigned to a variable is greater than the maximum value the variable can store

Question 45

numeric data type long

Answer 45

used for integers expected to exceed about 2 billion

Question 46

Random class

Answer 46

provides methods that return a random integer

Question 47

What statement imports the Random class?

Answer 47

import java.util.Random;

Question 48

API

Answer 48

application programming interface

Question 49

module

Answer 49

a group of related packages

Question 50

package

Answer 50

a group of related classes

Question 51

debugging (or troubleshooting)

Answer 51

the process of determining and fixing the cause of a problem in a program

Question 52

output formatting

Answer 52

adjusting the way that a program’s output appears

Question 53

format specifiers

Answer 53

specifies the type of value to print in it’s place, begins with the % character followed by another character that indicates the value type to be printed