Deck 4: Decision Structures

Question 1

What will be displayed after the following code has been 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.

Answer 1

D

Question 2

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

Answer 2

A

Question 3

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

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

Answer 3

C

Question 4

Which of the following strings could be passed to the DecimalFormat constructor to display 12.78 as 012.8?

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

Question 5

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 6

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

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

Question 7

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

Question 8

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 9

What is the value of ans after the following code has been executed?
Int x = 40;
Int y = 40;
Int ans = 0;
If (x = y)
Ans = x + 10;

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

Question 10

What will be displayed when the following code is executed?
Double x = 45678.259;
DecimalFormat formatter = new
DecimalFormat("#,###,##0.00"); JOptionPane.showMessageDialog(null,formatter.format(x));

A) 45,678.26
B) 45,678.3
C) 0,045,678.26
D) 45678.259

Question 11

What would 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 12

What will be displayed when the following code is executed?
Double x = 45678.259;
DecimalFormat formatter = new DecimalFormat("#,##0.0"); JOptionPane.showMessageDialog(null,formatter.format(x));

A) 45,678.26
B) 45,678.3
C) 45,678.259
D) 45678.259

Question 13

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 14

What would be the value of x after the following statements were 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 15

What will be the value of bonus after the following code is 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 16

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 statements or blocks are executed.

Question 17

A flag may have the values

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

Question 18

What will be displayed when the following code is 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 19

A block of code is enclosed in a set of

A) parentheses.
B) brackets.
C) braces.
D) double quotes.

Question 20

What would 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 21

Enclosing a group of statements inside a set of braces creates

A) an expression.
B) a block of statements.
C) a relational operator.
D) an if-else statement.

Question 22

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

Question 23

Which of the following statements determines whether temp is within the range of 0 through 100?

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 24

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 25

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 26

An important style rule you should adopt for writing if statements is to write the conditionally executed statement on the line after the if statement.

Question 27

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 28

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 29

What would 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 30

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 31

A local variable's scope always ends at the closing brace of the block of code in which it is declared.

Question 32

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

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

Question 33

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

Question 34

When two strings are compared using the String class's compareTo method, the comparison is case-insensitive.

Question 35

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 36

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 37

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

Question 38

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 39

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

Question 40

The DecimalFormat class is part of the Java API, but it is not automatically available to your programs.