Deck 2: Using Data

Question 1

The term ____ refers to the mathematical accuracy of a value.

A) float data
B) real integers
C) significant digits
D) single-precision floating-point number

Answer 1

C

Question 2

Constants hold a single value for the duration of the program execution.

Answer 2

True

Question 3

A ____ data type can hold 14 or 15 significant digits of accuracy.

A) double
B) float
C) char
D) boolean

Answer 3

A

Question 4

____ refers to the order in which values are used with operators.

A) Associativity
B) Initialization
C) Declaration
D) Floating

Question 5

Multiplication, division, and remainder always take place after addition or subtraction in an expression.

Question 6

A variable can hold more than one value at a time.

Question 7

A ____ is a named memory location that you can use to store a value.

A) cast
B) variable
C) reference
D) primitive

Question 8

The term parse means to break into component parts.

Question 9

A data item is ____ when it cannot be changed while a program is running.

A) variable
B) constant
C) primitive
D) literal

Question 10

Once a variable has been declared and initialized, new values may not be assigned to the variable.

Question 11

You can create a confirm dialog box with five arguments.

Question 12

The expression boolean isTenLarger = (10 < 5) will produce a value of true.

Question 13

You are limited to declaring a maximum of three variables in a single statement.

Question 14

In Java, ____ is a built-in class that provides you with the means for storing and manipulating character strings.

A) Escape
B) Type
C) String
D) Character

Question 15

Primitive types serve as the building blocks for more complex data types, called ____ types.

A) integer
B) literal
C) reference
D) data

Question 16

In Java, you use variables of type ____ to store integers, or whole numbers.

A) num
B) double
C) var
D) int

Question 17

A(n) ____ variable can hold only one of two values: true or false.

A) integer
B) boolean
C) true
D) comparison

Question 18

You use the ____ data type to hold any single character.

A) single
B) char
C) byte
D) float

Question 19

The legal integer values are -2³¹ through 2³¹-1. These are the highest and lowest values that you can store in four bytes of memory, which is the size of an int variable.

Question 20

Even if a statement occupies multiple lines, the statement is not complete until the semicolon is reached.

Question 21

____________________ forces a value of one data type to be used as a value of another type.

Question 22

When a numeric variable is concatenated to a String, the entire expression becomes a(n) ____.

A) int
B) constant
C) method
D) String

Question 23

A(n) ____________________ is a simple data type.

Question 24

When you write programs that accept ____________________, there is a risk that the user will enter the wrong type of data.

Question 25

You use ____ operators to perform calculations with values in your programs.

A) calculation
B) arithmetic
C) integer
D) precedence

Question 26

What is the value of result after the following statement is executed? int result = 2 + 3 * 4;

A) 9
B) 10
C) 14
D) 20

Question 27

A(n) ____ dialog box asks a question and provides a text field in which the user can enter a response.

A) question
B) JOptPane
C) confirm
D) input

Question 28

The percent sign is the ____ operator.

A) remainder
B) remaining
C) percentage
D) integer division

Question 29

A(n) ____________________ operator compares two items and the result has a Boolean value.

Question 30

The characters ____ move the cursor to the next line when used within a println() statement.

A) /n
C).+
B) \n
D) $

Question 31

The ____ is the type to which all operands in an expression are converted so that they are compatible with each other.

A) unifying type
B) data type
C) numbered
D) primitive

Question 32

Which escape sequence will move the cursor to the beginning of the current line?

A) \b
B) \r
C) \\
D) \n

Question 33

In Java, when a numeric variable is concatenated to a String using the ____, the entire expression becomes a String.

A) plus sign
B) equal sign
C) concatenate statement
D) string statement

Question 34

____ occurs when both of the operands are integers.

A) Data modeling
B) Type cast
C) Integer division
D) Unlike assignment

Question 35

You can store any character, including nonprinting characters such as a backspace or a tab, in a(n) ____ variable.

A) int
B) char
C) boolean
D) set

Question 36

A(n) ____________________ number contains decimal positions.

Question 37

You may declare an unlimited number of variables in a statement as long as the variables are ____.

A) the same data type
B) initialized to the same value
C) properly commented
D) floating point numbers

Question 38

Each primitive type in Java has a corresponding class contained in the java.lang package. These classes are called ____ classes.

A) case
B) primitive
C) type-wrapper
D) show

Question 39

A(n) ____ dialog box displays the options Yes, No, and Cancel.

A) confirm
B) input
C) message
D) answer

Question 40

Which of the following is NOT a component of a variable declaration statement?

A) data type identifier
B) symbolic constant
C) variable name
D) ending semicolon

Question 41

How would you ask the user to confirm an action using a dialog box?

Question 42

In Java, how is it possible to perform mathematical operations on operands with unlike types?

Question 43

Explain how you can override a unifying type imposed by Java.

Question 44

MATCHING
Match each term with the correct statement below.
a.operand
f.primitive
b.cast operator
g.float
c.assignment
h.boolean
d.operator precedence
i.escape sequence
e.garbage
The operator that is represented by an equal sign (=)

Question 45

MATCHING
Match each term with the correct statement below.
a.operand
f.primitive
b.cast operator
g.float
c.assignment
h.boolean
d.operator precedence
i.escape sequence
e.garbage
A programming term for an unknown value

Question 46

MATCHING
Match each term with the correct statement below.
a.operand
f.primitive
b.cast operator
g.float
c.assignment
h.boolean
d.operator precedence
i.escape sequence
e.garbage
A floating-point data type

Question 47

Describe how the use of named constants can provide advantages over the use of literal values.

Question 48

What is an escape sequence and why would a Java programmer use it to store a character?

Question 49

Describe how to assign values based on the result of comparisons to Boolean variables.

Question 50

A variable declaration is a statement that reserves a named memory location. It includes what four elements?

Question 51

MATCHING
Match each term with the correct statement below.
a.operand
f.primitive
b.cast operator
g.float
c.assignment
h.boolean
d.operator precedence
i.escape sequence
e.garbage
Java consistently specifies their size and format

Question 52

MATCHING
Match each term with the correct statement below.
a.operand
f.primitive
b.cast operator
g.float
c.assignment
h.boolean
d.operator precedence
i.escape sequence
e.garbage
Begins with a backslash followed by a character

Question 53

MATCHING
Match each term with the correct statement below.
a.operand
f.primitive
b.cast operator
g.float
c.assignment
h.boolean
d.operator precedence
i.escape sequence
e.garbage
A value that can be used on either side of an operator

Question 54

MATCHING
Match each term with the correct statement below.
a.operand
f.primitive
b.cast operator
g.float
c.assignment
h.boolean
d.operator precedence
i.escape sequence
e.garbage
Created by placing the desired result type in parentheses

Question 55

What is the difference between the float data type and the double data type?

Question 56

Describe and give an example of operator precedence.

Question 57

MATCHING
Match each term with the correct statement below.
a.operand
f.primitive
b.cast operator
g.float
c.assignment
h.boolean
d.operator precedence
i.escape sequence
e.garbage
Rules for the order in which parts of a mathematical expression are evaluated

Question 58

MATCHING
Match each term with the correct statement below.
a.operand
f.primitive
b.cast operator
g.float
c.assignment
h.boolean
d.operator precedence
i.escape sequence
e.garbage
true or false

Question 59

How can you create and use an input dialog box in Java?

Question 60

Describe the variation types byte, short, and long of the integer type.

Question 61

Write the statement that will declare and assign two integer variables, salesAmt and costAmt, in a single statement. Assign values of your choice to the variables.

Question 62

Describe why it is important to assign an appropriate data type to variables in an application.

Question 63

Write the statement to declare an uninitialized integer value for salesAmt.

Question 64

Why is the following relational operator expression invalid? How could you rewrite the statement so that it is valid?
boolean isGradePassing = (grade => 70);

Question 65

How could you alter the following statement to display "Welcome" on one line and "back" on another line?
System.out.println("Welcome back");

Question 66

char aCharacter = 2;
int aNumber = '2';
In the above statements, what values will be output after a println() statement is executed? Why are the output results different for the two statements?

Question 67

import javax.swing.JOptionPane;
public class salesJune
{
public static void main(String[] args)
{
int storeSales = 250;
______________________________
}
}
In the above code, complete the statement that will display a message dialog box that will appear centered on the screen and will display the following text:
Congratulations! June sales were $250!

Question 68

Describe three ways in which a constant differs from a variable.

Question 69

Describe how the Scanner class works with the System.in object in order to provide flexibility.

Question 70

Write the statement that will declare a char data type named testScore that will hold a letter grade of your choice.

Question 71

public class YourGrade
{
public static void main(String[] args)
{
int projectPoints = 89;
System.out.print("Your grade for this class is ");
System.out.print(projectPoints);
System.out.println("%");
}
}
Given the above code, what will be the output at the command prompt?

Question 72

final int COSTPERITEM = 10;
double sales2012 = amtSold * COSTPERITEM;
In the above statements, identify the named constant and describe how a programmer can recognize named constants.

Question 73

public class EndValue
{
public static void main(String[] args)
{
int aByte = 940;
System.out.print("The ending value is "+ aByte);
}
}
When the above code is compiled, what error message will be generated and why?

Question 74

Describe the error message that will be produced when the following code is compiled.
public class SalesOct
{
public static void main(String[] args)
{
int salesAmt;
System.out.print("October sales are $");
System.out.println(salesAmt);
}
}