Module 3: Decision Structure

Question 1

An operator that determines whether a specific relationship exist between two
values.

Answer 1

The Relational Operator

Question 2

Operator for greater than

Answer 2

>

Question 3

Operator for less than

Answer 3

<

Question 4

Operator for greater than or equal to

Answer 4

> =

Question 5

Operator for less than or equal to

Answer 5

<=

Question 6

Operator for equal to

Answer 6

==

Question 7

Operator for not equal to

Answer 7

!=

Question 8

Explain the difference between == and =

Answer 8

The double equal(==) is a relational operator which can use for comparison. The
boolean expression have a value of true or false. While the single equal (=) is an
assignment operator that uses to assign a value to the variable

Question 9

What is the value of the following expression?

int a = 5
a == 10

Answer 9

False

Question 10

int a = 5
a = 10

Answer 10

The value of a is simply changed to 10.

Question 11

How many variables does the left side of an expression must have when using the assignment operator?

Answer 11

Only single variable

Question 12

Which one is valid?
a. c = 5
b. c+d= 5

Answer 12

a is valid, b is invalid.

Question 13

Also known as Boolean operators, operate on Boolean values to
create a new Boolean value.

Answer 13

Logical Operator

Question 14

Sometimes, a statement is executed is determined by a combination of
several conditions. What can you use to combine these conditions?

Answer 14

Logical Operator

Question 15

What is the name of the ! operator?

Answer 15

not

Question 16

Rule of the ! operator

Answer 16

Opposite of the expression

Question 17

Name of && operator

Answer 17

And

Question 18

Rules of && operator

Answer 18

One false, all false

Question 19

Name of || operator

Answer 19

Or

Question 20

Rules of || operator

Answer 20

One true, all true

Question 21

What would be the result?

20 > 18 && 49 < 50

Answer 21

20 > 18 = True
49 < 50 = True
The expression uses the && operator (one false, all false). Therefore the result is true.

Question 22

What would be the result?
kg = 49
age = 20

20 > 30 || 49 < 51

Answer 22

20 > 30 = False
49 < 51 = True

The expression uses the || operator (one true, all true). Therefore, the result is true.

Question 23

What is the precedence of the logical operators?

Answer 23

AND (&&) - Highest
OR (||)
NOT (!) - Lowest

Question 24

What would be the result of the following expression?

!(3>4)|| !(12>4) && !(4>1)

Answer 24

!(3>4)|| !(12>4) && !(4>1)
!(False) || !(True) && !(True)
True || False && False
True || False
True

Question 25

Can relational operators (==, >=, etc) be used to test character data?

Answer 25

Yes

Question 26

What will you use to compare String objects?

Answer 26

A String method

Question 27

To compare the contents of two String objects correctly, use the String class's equals method.

Answer 27

StringReference1.equals(StringReference2)

Question 28

The String class also provides the compareTo method, which can be used to determine whether one string is greater than, equal to, or less than another string.

Answer 28

StringReference.compareTo(OtherString)

Question 29

What does the compareTo method return?

Answer 29

It returns an integer value.

Question 30

What does it mean if the method's return value is negative?

Answer 30

StringReference is less than Other String.

Question 31

What does it mean if the method's return value is zero?

Answer 31

The two strings are equal.

Question 32

What does it mean if the method's return value is positive?

Answer 32

StringReference is greater than OtherString

Question 33

Used to create a decision structure, which allows a program to have more than one path of execution.

Answer 33

The If Statement

Question 34

Causes one or more statements to execute only when a boolean expression is true.

Answer 34

The If Statement

Question 35

import java.util.scanner;

Answer 35

To import the scanner class.

Question 36

Scanner input = new Scanner(System.in); String color = input.nextLine;

Answer 36

"input" is the name of the class

Question 37

Lets the value of a variable or expression determine where the program will branch to.

Answer 37

The Switch Statement

Question 38

Is a multiple alternative decision structure. It allows you to test the value of a variable or an expression and then use that value to determine which statement or set of statements to execute.

Answer 38

The Switch Statement

Question 39

Allows you to format output in a variety of ways.

Answer 39

System.out.printtf(FormatString, ArgumentList);

Question 40

String that contains text, special formatting specifiers, or both.

Answer 40

Optional and can be used to perform actions when none of the specified cases matches the switch-expression.

Question 41

Statement that immediately ends the switch statement.

Answer 41

break

Question 42

optional, can be used to perform actions when none of the specified cases matches the switch-expression.

Answer 42

default

Question 43

What is the general format for the system.out.printtf method?

Answer 43

System.out.printf(FormatString, ArgumentList)

Question 44

Allows you to format output in a variety of ways.

Answer 44

System.out.printtf

Question 45

What would the output be? int dogs = 2; int cats = 4; System.out.printtf("We have %d dogs and %d cats \n", dogs, cats)"

Answer 45

Output: We have 2 dogs and 4 cats

Question 46

All format specifiers begin with what?

Answer 46

%

Question 47

They cause the value to be formatted in a variety of ways in a format specifier.

Answer 47

Flags

Question 48

You can optionally specify the minimum field width for the value.

Answer 48

Width

Question 49

All format specifiers must end with a conversion character, such as f (%f) for floating-point, or d (%d) for decimal integer

Answer 49

Conversion

Question 50

You can change the number of decimal points that are displayed

Answer 50

Precision

Question 51

What would the output be? double temp = 78.42819; System.out.printf("The temperature is %2f degrees.\n", temp);

Answer 51

Output: The temperature is 78.4 degrees.

Question 52

What will happen if you specify a precision with the %d format specifier?

Answer 52

An error at runtime will occur because **precision can only be specified with floating-point values**

Question 53

The minimum number of spaces that should be used to display the value

Answer 53

Minimum Field Width

Question 54

What would the output be? double number = 12345.6789; System.out.printf("The number is:%20f\n", number);

Answer 54

Output: The number is: 12345.678900

Question 55

Comma Separator What would the output be? double amount = 1234567.89; System.out.printf("The value is %,f\n", amount);

Answer 55

Output : The value is 1,234,567.890000

Question 56

Adding numbers with Leading Zeros What would the output be? double number = 123.4; System.out.printf("The number is:%08.1f\n ", number);

Answer 56

Output: The number is: 1,234,567.890000

Question 57

%[flags][width][.precision]conversion

Answer 57

General format for format specifiers.

Question 58

What happens if the break statement is omitted?

Answer 58

The program would execute all of the lines from the matching case statement to the end other block.

Question 59

can be assigned a value only once, and then it cannot be changed later in the program.

Answer 59

Named Constant

Question 60

What is the keyword preceding a named constant in its declaration statement?

Answer 60

final