Alternative names given to variables or memory locations

What is an Else Statement?

The block of code that runs when the if condition evaluates to false

What does an else block do?

Executes if the if condition is false

What is the primary advantage of short-circuit evaluation?

It prevents unnecessary computations

What is Logical Equality?

A comparison that checks whether two values are logically equivalent

What is a Control Structure?

A programming construct that manages flow of execution based on conditions

What are Truth Tables?

A table showing all possible logical outputs based on given Boolean inputs

How does Java handle short-circuit evaluation with && and ||?

It stops evaluating as soon as the result is determined

What happens if an if statement condition evaluates to false?

The code inside the block is skipped

What happens when you use the & operator with Booleans in Java?

It performs a bitwise AND operation

What are Relational Operators?

Symbols used to compare values, such as ==, >, and <

What is the difference between == and .equals() when comparing Boolean objects in Java?

== checks reference equality, .equals() checks logical equality

What does short-circuit evaluation do in logical expressions?

Stops evaluation once the result is determined

What is Reference Equality?

A comparison checking whether 2 variables refer to the same memory location

What is an If Statement?

A conditional statement that executes only if a specific condition is true

What is an If-Else Statement?

One line of code executed if a condition is true, but another if false

What are Nested If Statements?

If statements placed inside other if statements to handle many conditions

In which situation would an if condition using a Boolean expression always execute its code block?

If the Boolean expression always evaluates to true

What is an Else-If Statement?

A conditional statement checks other conditions if first condition is false

What is Short Circuit Evaluation?

A process where evaluation stops as soon as the final result is determined

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Codehs Chapter 3: Booleans

50 termsStudBud Administration11 plays

Tests computer science knowledge of boolean expressions.

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Questions 50

Answers

1
What is the result of Boolean.logicalAnd(true, false)?
null
false
true
Compilation Error
2
Which of the following is a valid relational operator?
**
>=
++
<<
3
What will the following Boolean expression evaluate to?
undefined
null
true
false
4
What is the result of Boolean b = false; System.out.println(!b);?
true
false
null
Compilation Error
5
What is the default Boolean value of an uninitialized Boolean variable in Java?
undefined
true
false
null
6
What are Aliases?
A method used to encrypt data
A structure used in binary search trees
A keyword used in SQL to reference a column
Alternative names given to variables or memory locations
7
What is an Else Statement?
The block of code that runs when the if condition evaluates to false
A variable declaration in Java
A keyword used to create an infinite loop
A function used to exit a loop prematurely
8
How do you correctly compare two Boolean values b1 and b2 in Java?
b1 == b2
b1.equals(b2)
Boolean.compare(b1, b2)
b1.compare(b2)
9
What happens when you try to assign null to a boolean variable in Java?
The value of the boolean becomes true
Runtime error
Compilation error
The value of the boolean becomes false
10
What is the output of true && false?
true
null
undefined
false
11
What does an else block do?
Loops back to the start of the program
Executes if the if condition is false
Stops execution of the program
Assigns a value to a variable
12
In Boolean algebra, what is the result of A && (B || C) simplified using distribution?
A && B && C
A || (B && C)
A || B && C
(A && B) || (A && C)
13
In most programming languages, what is the numeric equivalent of true and false in Boolean logic?
1 for true, -1 for false
true and false have no numeric equivalent
1 for true, 0 for false
0 for true, -1 for false
14
What is the result of the following Boolean expression: !(true || false) && (false || true && false)
undefined
null
false
true
15
What is the primary advantage of short-circuit evaluation?
It ensures all conditions are evaluated
It is required in all programming languages
It always results in faster program execution
It prevents unnecessary computations
16
What is Logical Equality?
A method used to ensure variables are stored in contiguous memory
A process that determines if 2 numbers have the same binary representation
A comparison that checks whether two values are logically equivalent
A sorting algorithm used in Boolean algebra
17
What will System.out.println(5 > 3 && 8 < 4); output in Java?
false
true
null
Compilation Error
18
Which Boolean identity states that A && true = A?
Distributive Law
Complement Law
Domination Law
Identity Law
19
Which of the following is the correct way to declare a Boolean variable in Java?
Boolean flag = "true";
bool flag = True;
boolean flag = true;
boolean flag = 1;
20
What is a Control Structure?
A structure that controls access to system resources in an operating system
A data structure used to store elements in a queue
A programming construct that manages flow of execution based on conditions
A feature in databases that manages concurrent transactions
21
What does the ! operator do in Boolean logic?
Performs a bitwise operation
Converts a number to a Boolean
Negates a Boolean value
Checks equality between two values
22
What are Truth Tables?
A data structure used for storing truth values in an array
A method for optimizing sorting algorithms
A table showing all possible logical outputs based on given Boolean inputs
A function used to determine the efficiency of a program
23
How does Java handle short-circuit evaluation with && and ||?
It always evaluates both sides of the expression
It ignores false values
It throws an exception if evaluation is incomplete
It stops evaluating as soon as the result is determined
24
What is the result of true || false && false?
false
null
undefined
true
25
What happens if an if statement condition evaluates to false?
The code inside the block is executed
The code inside the block is skipped
The condition is automatically set to true
The program crashes
26
What will Boolean.parseBoolean("TRUE") return in Java?
true
null
false
Compilation Error
27
What happens when you use the & operator with Booleans in Java?
It performs a bitwise AND operation
It converts Booleans to integers
It acts like && and short-circuits
It throws an exception
28
What are Relational Operators?
Functions that manage database relationships between tables
Operators used to perform mathematical operations like +, -, and *
Special symbols used in encryption algorithms
Symbols used to compare values, such as ==, >, and <
29
What will Boolean b = null; System.out.println(b && true); do in Java?
Compile successfully and print null
Print false
Print true
Throw a NullPointerException
30
What is the difference between == and .equals() when comparing Boolean objects in Java?
== checks reference equality, .equals() checks logical equality
== is preferred for Boolean comparisons
.equals() compares reference memory locations
Both check for the same thing
31
Which of the following Boolean expressions always evaluates to true?
A && !A
!A && !B
!(A && !A)
A || !A && A
32
Which Boolean algebra law justifies the equivalence of A || (B && A) and A?
Absorption Law
Associative Law
De Morgan’s Law
Idempotent Law
33
What does short-circuit evaluation do in logical expressions?
Stops evaluation once the result is determined
Converts Boolean expressions to numbers
Runs all conditions regardless of outcome
Executes a loop
34
What will Boolean x = false; Boolean y = false; System.out.println(x == y); print?
true
null
false
Compilation Error
35
What is Reference Equality?
A property of functions that ensures they always return the same output
A comparison checking whether 2 variables refer to the same memory location
A technique used in hash table collision resolution
A function that determines if two objects have the same value
36
What is the output of true || false?
null
false
true
undefined
37
What is the result of true ^ false ^ true in Java?
true
NullPointerException
false
Compilation Error
38
What will 5 > 3 && 2 < 4 evaluate to?
true
undefined
false
null
39
What is an If Statement?
A keyword used to define functions in a program
A conditional statement that executes only if a specific condition is true
A method used to declare variables in Java
A loop structure that repeats a block of code indefinitely
40
What is an If-Else Statement?
A method for defining a switch-case statement
A function used for handling exceptions in code
One line of code executed if a condition is true, but another if false
A way to compare two objects for equality
41
What are Nested If Statements?
If statements placed inside other if statements to handle many conditions
A function that creates multiple copies of a variable
A structure used to manage memory allocation
A loop that runs indefinitely without conditions
42
In which situation would an if condition using a Boolean expression always execute its code block?
If the Boolean expression contains an && operator
If the Boolean expression always evaluates to false
If the Boolean expression always evaluates to true
If the Boolean expression is inside a function
43
What keyword is used to check multiple conditions in an if statement?
elseif
else if
when
if else
44
What is an Else-If Statement?
A conditional statement checks other conditions if first condition is false
A loop that repeats until a certain condition is met
A method used to sort arrays in Java
A function that compares two objects for equality
45
Which data type is returned by a Boolean expression?
Cheeseburger
Boolean
Integer
String
46
What does Boolean.compare(true, false) return?
Compilation Error
1
-1
0
47
What is a nested if statement?
An if statement that never runs
A statement that loops indefinitely
An if inside another if
A function with multiple parameters
48
Which operator is used for logical AND in Java?
&
&&
&&&
AND
49
What is Short Circuit Evaluation?
A method used to optimize recursion in programming
A process where evaluation stops as soon as the final result is determined
A technique for compressing binary data
A security feature that prevents unauthorized access to memory
50
What will System.out.println(Boolean.valueOf("TrUe") == Boolean.TRUE); print?
false
Complation Error
true
NullPointerException

Codehs Chapter 3: Booleans Flashcards | StudBud