Deck 4: Decision Structures

Question 1

Which of the following expressions could be used to perform a case-insensitive comparison of two String objects named str1 and str2?

A) str1.equalsIgnoreCase(str2)
B) str1.equalsInsensitive(str2)
C) str1 != str2
D) str1 || str2

Answer 1

A

Question 2

When testing for character values, the switch statement does not test for the case of the character.

Answer 2

False

Question 3

The DecimalFormat class is part of the Java API so it is automatically available to your programs.

Answer 3

False

Question 4

The boolean expression in an if statement must evaluate to

A) degrees or radians
B) true or false
C) positive or negative
D) left or right

Question 5

__________ operators are used to determine whether a specific relationship exists between two values.

A) Assignment
B) Arithmetic
C) Logical
D) Relational

Question 6

In an if-else statement, if the boolean expression is false

A) no statements or blocks are executed
B) the statement or block following the else is executed
C) the first statement or block is executed
D) all the statements or blocks are executed

Question 7

All it takes for an AND expression to be true is for one of the subexpressions to be true.

Question 8

A flag may have the values

A) defined or undefined
B) true or false
C) of any range of integers
D) of any Unicode character

Question 9

Which of the following strings could be passed to the DecimalFormat constructor to display 12.78 as 12.8?

A) "###.#"
B) "###.0"
C) "000.0"
D) "#0.00%"

Question 10

A block of code is enclosed in a set of

A) braces, { }
B) parentheses, ( )
C) brackets, [ ]
D) double quotes, " "

Question 11

If the expression on the left side of the && operator is false, the expression on the right side will not be checked.

Question 12

Which of the following strings could be passed to the DecimalFormat constructor to display 12.78 as 12.8%?

A) "##0.0%"
B) "###.##%"
C) "000.0%"
D) "#0.00%"

Question 13

When two strings are compared using the String class's compareTo method, the comparison is not case sensitive.

Question 14

Unicode is an international encoding system that is extensive enough to represent all the characters of all the world's alphabets.

Question 15

A random number, created as an object of the Random class, is always an integer.

Question 16

In a switch statement, if two different values for the CaseExpression would result in the same code being executed, you must have two copies of the code, one after each CaseExpression.

Question 17

All it takes for an OR expression to be true is for one of the subexpressions to be true.

Question 18

An important style rule that should be used when writing if statements is to write the conditionally executed statement on the line after the if statement.

Question 19

If str1 and str2 are both String objects, which of the following expressions will correctly determine whether or not they are equal?

A) str1 = str2
B) str1 && str2
C) str1.equals(str2)
D) str1 += str2

Question 20

The if-else statement will execute one group of statements if its boolean expression is true or another group if its boolean expression is false.

Question 21

Which of the following expressions will generate a random number in the range of 1 through 10?

A) myNumber = randomNumbers.nextInt(10);
B) myNumber = randomNumbers.nextInt(1) + 10;
C) myNumber = randomNumbers.nextInt(11) - 1;
D) myNumber = randomNumbers.nextInt(10) + 1;

Question 22

What will be the value of x after the following statements are executed?
int x = 75;
Int y = 60;
If (x > y)
X = x - y;

A) 60
B) 75
C) 15
D) 135

Question 23

What will be displayed after the following statements are executed?
int x = 65;
Int y = 55;
If (x >= y)
{
Int ans = x + y;
}
System.out.println(ans);

A) 10
B) 120
C) 100
D) The code contains an error and will not compile.

Question 24

What will be the values of ans, x, and y after the following statements are executed?
int ans = 35, x = 50, y = 50;
If (x >= y)
{
Ans = x + 10;
X -= y;
}
Else
{
Ans = y + 10;
Y += x;
}

A) ans = 60, x = 0, and y = 50
B) ans = 45, x = 50, and y = 0
C) ans = 45, x = 50, and y = 50
D) ans = 60, x = 50, and y = 100

Question 25

What will be the value of ans after the following statements are executed?
int x = 40;
Int y = 40;
If (x = y)
Ans = x + 10;

A) 30
B) 80
C) 50
D) The code contains an error and will not compile.

Question 26

The __________ statement is used to create a decision structure which allows a program to have more than one path of execution.

A) block
B) if
C) null
D) flag

Question 27

A __________ is a boolean variable that signals when some condition exists in the program.

A) sentinel
B) flag
C) block
D) case

Question 28

Which of the following statements determines whether the variable temp is within the range of 0 through 100 (inclusive)?

A) if (temp >= 0 && temp <= 100)
B) if (temp > 0 && temp < 100)
C) if (temp >= 0 || temp <= 100)
D) if (temp > 0 || temp < 100)

Question 29

What will be displayed after the following statements are executed?
int hours = 30;
Double pay, payRate = 10.00;
Pay = hours <= 40 ? hours*payRate : hours*payRate*2.0;
System.out.println(pay);

A) 300.0
B) 600.0
C) 400.0
D) The code contains an error and will not compile.

Question 30

Enclosing a group of statements inside a set of braces creates

A) an expression
B) a block of statements
C) a relational operator
D) a conditional statement

Question 31

Which of the following expressions determines whether the char variable, chrA, is not equal to the letter 'A'?

A) chrA == 'A'
B) chrA != 'A'
C) chrA || 'A'
D) chrA.notEquals(A)

Question 32

Java requires that the boolean expression being tested by an if statement be enclosed in

A) a set of parentheses
B) a set of braces
C) a set of double quotes
D) a set of brackets

Question 33

What will be the value of discountRate after the following statements are executed?
double discountRate;
Char custType = 'B';
Switch (custType)
{
Case 'A':
DiscountRate = 0.08;
Break;
Case 'B':
DiscountRate = 0.06;
Case 'C':
DiscountRate = 0.04;
Default:
DiscountRate = 0.0;
}

A) 0.08
B) 0.06
C) 0.04
D) 0.0

Question 34

What will be the value of discountRate after the following statements are executed?
double discountRate = 0.0;
Int purchase = 100;
If (purchase > 1000)
DiscountRate = 0.05;
Else if (purchase > 750)
DiscountRate = 0.03;
Else if (purchase > 500)
DiscountRate = 0.01;

A) 0.0
B) 0.05
C) 0.03
D) 0.01

Question 35

When a character is stored in memory, it is actually the __________ that is stored.

A) Unicode number
B) ASCII code
C) floating-point value
D) letter, symbol, or number

Question 36

Which of the following expressions will determine whether x is less than or equal to y?

A) x <= y
B) x => y
C) x >= y
D) x =< y

Question 37

What will be the value of bonus after the following statements are executed? int bonus, sales = 10000;
If (sales < 5000)
Bonus = 200;
Else if (sales < 7500)
Bonus = 500;
Else if (sales < 10000)
Bonus = 750;
Else if (sales < 20000)
Bonus = 1000;
Else
Bonus = 1250;

A) 750
B) 1250
C) 500
D) 1000

Question 38

What will be the value of discountRate after the following statements are executed?
double discountRate = 0.0;
Int purchase = 1250;
Char cust = 'N';
If (purchase > 1000)
If (cust == 'Y')
DiscountRate = 0.05;
Else
DiscountRate = 0.04;
Else if (purchase > 750)
If (cust == 'Y')
DiscountRate = 0.04;
Else
DiscountRate = 0.03;
Else
DiscountRate = 0.0;

A) 0.0
B) 0.04
C) 0.05
D) 0.03

Question 39

What will be displayed after the following statements are executed?
int y = 10;
If (y == 10)
{
Int x = 30;
X += y;
System.out.println(x);
}

A) 40
B) 30
C) 20
D) The code contains an error and will not compile.

Question 40

What will be the value of x after the following statements are executed?
int x = 10;
Switch (x)
{
Case 10:
X += 15;
Case 12:
X -= 5;
Break;
Default:
X *= 3;
}

A) 30
B) 20
C) 25
D) 5

Question 41

Select all that apply. Which method of the Random class will return a random number within the range of 0.0 and 1.0?

A) nextDouble()
B) nextLong()
C) nextFloat()
D) nextInt(int n)

Question 42

Which of the following statements will create an object from the Random class?

A) randomNumbers() = new Random();
B) Random myNumber = new Random();
C) myNumber = new Random();
D) Random = new randomNumbers();