Question 1

A company applies a discount based on the size of the order. If the order is over $50, the discount is 5%. If the order is over $100, the discount is 10%. Otherwise, there is no discount. If the integer variable order contains the size of the order, which of the following will assign the double variable discount the correct value? 
A) if (order > 100)
Discount = 0.10;
Else if (order > 50)
Discount = 0.05;
Else
Discount = 0;
B) if (order > 100)
Discount = 0.10;
If (order > 50)
Discount = 0.05;
Else
Discount = 0;
C) if (order > 100)
Discount = 0.10;
If (order > 50)
Discount = 0.05;
If (order <= 50)
Discount = 0;
D) if (order > 50)
Discount = 0.05;
Else if (order > 100)
Discount = 0.10;
Else
Discount = 0;

Accepted Answer

The correct logic is to first check if the order is over $100 to apply the 10% discount, and then check if it's over $50 for the 5% discount. Option A correctly implements this logic using else-if statements.

Question 2

What will be printed by the statements below?
Int a = 10;
Int b = 20;
Int count = 0;
If (a > 5)
{
Count ++;
}
Else if (b > 5)
{
Count ++;
}
Else if (a > 10)
{
Count ++;
}
Else if (b > 10)
{
Count ++;
}
System.out.print (count);
A)1
B)2
C)3
D)4

Accepted Answer

Both a and b are greater than 5, so the count will be incremented twice.

Question 3

Which of the following conditions will correctly check if the String variable greeting is "bonjour"?
A)if (greeting == "bonjour")
B)if (greeting.compareTo("bonjour") < 0)
C) if (greeting.equals("bonjour"))
D)if (greeting.compareTo("bonjour") > 0)

Accepted Answer

Option C, "if (greeting.equals("bonjour"))", is the correct choice to check if the String variable greeting is "bonjour". The equals() method compares the content of the two strings and returns true only if they're identical. Option A (greeting == "bonjour") will not work, because the equality operator == is checking the reference of the two string objects instead of the content. Option B (greeting.compareTo("bonjour") < 0) and Option D (greeting.compareTo("bonjour") > 0) will not work either, because they compare the Strings using the lexicographic order, so bonjour will not be equal to itself.

Question 4

Which of the following performs the same way as the switch statement below? switch (value) { Case 1: System.out.print ("Small"); break; Case 10: System.out.print ("Large"); break; Default: System.out.print ("Other"); break; } A)if (value == 1) System.out.print ("Small"); Else if (value == 10) System.out.print ("Large"); Else System.out.print ("Other"); B)if (value == 1) System.out.print ("Small"); If (value == 10) System.out.print ("Large"); Else System.out.print ("Other"); C)if (value <= 1) System.out.print ("Small"); Else if (value >= 10) System.out.print ("Large"); Else System.out.print ("Other"); D)if (value <= 1) System.out.print ("Small"); If (value >= 10) System.out.print ("Large"); Else System.out.print ("Other");

Accepted Answer

The if-else statement in option A performs the same way as the switch statement because it checks for specific values of value and executes the corresponding code block.

Question 5

Which of the following conditions tests for the user to enter the string "Hello"? String s;
Scanner in = new Scanner(System.in);
System.out.print("Enter a word: ");
S = in.next();
A) if (s == "Hello")
B) if == "Hello")
C) if (s.equals("Hello"))
D) if (s = "Hello")

Accepted Answer

The correct way to compare strings in Java is by using the `.equals()` method, as it checks for the content equality of the strings.

Question 6

Which of the following conditions can be added to the code below so it will assign the larger value of two integer variables a and b to the integer variable maximum?
If (/* put condition here */)
{
Maximum = a;
}
Else
{
Maximum = b;
}
A)a == b
B)b > a
C)a > b
D)a)compareTo (b) > 0

Accepted Answer

The condition "a > b" will correctly assign the larger value to the variable "maximum" by setting "maximum = a" when "a" is greater than "b". If "a" is not greater than "b", the else block will execute, assigning "maximum = b".

Question 7

What will be printed by the statements below?
Int a = 10;
If (a > 5)
{
System.out.print ("One");
}
Else
{
System.out.print ("Two");
}
System.out.print ("Three");
A)One
B)OneThree
C)TwoThree
D)OneTwoThree

Accepted Answer

The if statement checks if a is greater than 5. Since a is 10, the condition is true and the statement inside the if block is executed, printing "One". The else block is skipped. The statement after the if-else block, which prints "Three", is always executed. Therefore, the output is "OneThree".

Question 8

Assume the following variables have been declared and given values elsewhere: boolean completedProject;
Int programsDone;
Double classPercentage;
A student will pass programming class if and only if they have a percentage of 70.0% or higher and have either completed the project or they have done 5 or more programs. Which of the following statements assigns the Boolean variable passProgramming correctly?
A)passProgramming = (classPercentage >= 0.7) && (programsDone >= 5 || completedProject);
B)passProgramming = (classPercentage >= 0.7) && (programsDone >= 5) && (completedProject);
C)passProgramming = (classPercentage >= 0.7) || (programsDone >= 5) || (completedProject);
D)passProgramming = ((classPercentage >= 0.7) && (programsDone >= 5 )) && completedProject;

Accepted Answer

The correct condition for passing is having a class percentage of 70.0% or higher and either completing the project or doing 5 or more programs. Option A correctly implements this logic using the && and || operators.

Question 9

What will be printed by the statements below?
Int a = 10;
Int b = 20;
Int count = 0;
If (a > 10)
{
Count ++;
If (b > 5)
{
Count ++;
}
If (a > 10)
{
Count ++;
}
}
If (b > 10)
{
Count ++;
}
System.out.print (count);
A)1
B)2
C)3
D)4

Accepted Answer

The answer of What will be printed by the statements...

Question 10

Which of the following conditions will correctly check if the String variable early comes before "middle" alphabetically?
A)if (greeting <= "middle")
B)if (greeting.compareTo("middle") > 0)
C)if (greeting.compareTo("middle") == 0)
D)if (early.compareTo("middle") < 0)

Accepted Answer

To check if a String variable comes before another String alphabetically, we can use the compareTo() method. This method returns a negative value if the String comes before the argument String in alphabetical order. Therefore, if early.compareTo("middle") returns a negative value, it means that early comes before middle alphabetically. Choice A is incorrect because it uses the <= operator, which is the wrong operator to use for alphabetic comparison of Strings. Choice B is incorrect because it checks if greeting comes after "middle" alphabetically, which is the opposite of what we want. Choice C is incorrect because it checks if greeting is the same as "middle", which is not relevant for this comparison.

Question 11

Assume isBusy has been defined to be a Boolean variables. Which of the following has the same value as (isBusy || true) && !isBusy?
A)isBusy
B)!isBusy
C)true
D)false

Accepted Answer

The answer of Assume isBusy has been defined to be...

Question 12

Assume the following variables have been declared and given values elsewhere: boolean isFelon;
Int age;
A person may vote if they are 18 or older and not a felon. Which of the following statements assigns the Boolean variable mayVote correctly?
A)mayVote = (age >= 18) || !isFelon;
B)mayVote = !((age >= 18) && isFelon);
C)mayVote = (age >= 18) && !isFelon;
D)mayVote = !((age >= 18) || isFelon);

Accepted Answer

A person can vote if they are 18 or older and not a felon, which is correctly represented by the condition (age >= 18) && !isFelon.

Question 13

Assume isBusy has been defined to be a Boolean variables. Which of the following has the same value as (isBusy || true) && false?
A)isBusy
B)!isBusy
C)true
D)false

Accepted Answer

Since (isBusy || true) will always be true, and (true && false) will always be false, the expression as a whole will always evaluate to false. Therefore, the only option that has the same value is D) false.

Question 14

Assume isBusy and isHappy have been defined to be Boolean variables. Which of the following conditions has the same value as !isBusy || isHappy?
A)!(isBusy || !isHappy)
B)isBusy && !isHappy
C)!(isBusy && !isHappy)
D)isBusy || !isHappy

Accepted Answer

The expression !isBusy || isHappy means "not busy or happy". The equivalent expression using De Morgan's laws is "not (busy and not happy)", which is option C: !(isBusy && !isHappy). This is because De Morgan's laws allow us to distribute the negation across the conditions inside the parentheses, flipping the AND to OR and negating each internal condition.

Question 15

What will be printed by the statements below?
Int a = 10;
Int b = 20;
Int count = 0;
If (a > 5)
If (b > 5)
{
Count ++;
}
Else
Count = 7;
System.out.print (count);
A)0
B)1
C)7

Accepted Answer

The answer of What will be printed by the statements...

Question 16

Which of the following conditions is true only when the integer variable middle is between the values 0 and 10?
A)(0 <= middle) && (middle <= 10)
B)0 <= middle <= 10
C)(0 <= middle) || (middle <= 10)
D)(0 <= 10) && (middle <= 10)

Accepted Answer

The condition (0 <= middle) && (middle <= 10) checks if 'middle' is greater than or equal to 0 and less than or equal to 10, which means 'middle' is between 0 and 10, inclusive.

Question 17

Which of the following options checks that character ch is neither a letter nor a white space?
A) if (!Character.isLetter(ch) || !Character.isWhiteSpace(ch))
B) if (!(Character.isLetter(ch) || Character.isWhiteSpace(ch)))
C) if (!(Character.isLetter(ch) && Character.isWhiteSpace(ch)))
D) if (!Character.isLetter(ch) || Character.isWhiteSpace(ch))

Accepted Answer

The condition in option B checks that the character is not a letter (using the negation operator ! before Character.isLetter(ch)) or it is not a white space (using the negation operator ! before Character.isWhiteSpace(ch)). This is the correct way to check that ch is neither a letter nor a white space. Option A is incorrect because it checks that ch is not a letter or not a white space, which is not the same as checking that it is neither. Option C is incorrect because it checks that ch is not both a letter and a white space, which is not what we want. Option D is incorrect because it only checks that ch is not a letter or it is a white space, which is not the same as checking that it is neither.

Question 18

Which of the following conditions is true only when the integer variable number is even?
A)number / 2 == 0
B)number > 2
C)number / 2 > 1
D)number % 2 == 0

Accepted Answer

The condition "number % 2 == 0" checks if the remainder when the number is divided by 2 is zero, which is true only for even numbers.

Question 19

What will be printed by the statements below?
Int a = 10;
Int b = 20;
Int count = 0;
If (a > 5)
{
Count ++;
If (b > 5)
{
Count ++;
}
}
If (a > 10)
{
Count ++;
If (b > 10)
{
Count ++;
}
}
System.out.print (count);
A)1
B)2
C)3
D)4

Accepted Answer

The answer of What will be printed by the statements...

Question 20

What will be printed by the statements below?
Int a = 10;
Int b = 20;
Int count = 0;
If (a > 5)
{
Count ++;
}
If (b > 5)
{
Count ++;
}
If (a > 10)
{
Count ++;
}
If (b > 10)
{
Count ++;
}
System.out.print (count);
A)1
B)2
C)3
D)4

Accepted Answer

The variable 'count' is incremented for each true condition. The conditions (a > 5), (b > 5), and (b > 10) are true, so 'count' is incremented three times.

Quiz 5: Decisions

What will be printed by the statements below? Int a = 10; Int b = 20; Int count = 0; If (a > 5) { Count ++; } Else if (b > 5) { Count ++; } Else if (a > 10) { Count ++; } Else if (b > 10) { Count ++; } System.out.print (count) ;

Which of the following conditions will correctly check if the String variable greeting is "bonjour"?

Which of the following performs the same way as the switch statement below? switch (value) { Case 1: System.out.print ("Small") ; break; Case 10: System.out.print ("Large") ; break; Default: System.out.print ("Other") ; break; }

Which of the following conditions tests for the user to enter the string "Hello"? String s; Scanner in = new Scanner(System.in) ; System.out.print("Enter a word: ") ; S = in.next() ;

Which of the following conditions can be added to the code below so it will assign the larger value of two integer variables a and b to the integer variable maximum? If (/* put condition here */) { Maximum = a; } Else { Maximum = b; }

What will be printed by the statements below? Int a = 10; If (a > 5) { System.out.print ("One") ; } Else { System.out.print ("Two") ; } System.out.print ("Three") ;

What will be printed by the statements below? Int a = 10; Int b = 20; Int count = 0; If (a > 10) { Count ++; If (b > 5) { Count ++; } If (a > 10) { Count ++; } } If (b > 10) { Count ++; } System.out.print (count) ;

Which of the following conditions will correctly check if the String variable early comes before "middle" alphabetically?

Assume isBusy has been defined to be a Boolean variables. Which of the following has the same value as (isBusy || true) && !isBusy?

Assume the following variables have been declared and given values elsewhere: boolean isFelon; Int age; A person may vote if they are 18 or older and not a felon. Which of the following statements assigns the Boolean variable mayVote correctly?

Assume isBusy has been defined to be a Boolean variables. Which of the following has the same value as (isBusy || true) && false?

Assume isBusy and isHappy have been defined to be Boolean variables. Which of the following conditions has the same value as !isBusy || isHappy?

What will be printed by the statements below? Int a = 10; Int b = 20; Int count = 0; If (a > 5) If (b > 5) { Count ++; } Else Count = 7; System.out.print (count) ;

Which of the following conditions is true only when the integer variable middle is between the values 0 and 10?

Which of the following options checks that character ch is neither a letter nor a white space?

Which of the following conditions is true only when the integer variable number is even?

What will be printed by the statements below? Int a = 10; Int b = 20; Int count = 0; If (a > 5) { Count ++; If (b > 5) { Count ++; } } If (a > 10) { Count ++; If (b > 10) { Count ++; } } System.out.print (count) ;

What will be printed by the statements below? Int a = 10; Int b = 20; Int count = 0; If (a > 5) { Count ++; } If (b > 5) { Count ++; } If (a > 10) { Count ++; } If (b > 10) { Count ++; } System.out.print (count) ;