Boolean type and logical operators in Kotlin - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the Boolean type in Kotlin?

The Boolean type in Kotlin represents a value that can be either true or false. It is used to store logical values.

beginner

What does the logical AND operator (&&) do in Kotlin?

The logical AND operator (&&) returns true only if both operands are true. Otherwise, it returns false.

beginner

Explain the logical OR operator (||) in Kotlin.

The logical OR operator (||) returns true if at least one of the operands is true. It returns false only if both operands are false.

beginner

What does the logical NOT operator (!) do in Kotlin?

The logical NOT operator (!) reverses the value of a Boolean. If the value is true, it becomes false, and vice versa.

intermediate

How can you combine multiple logical operators in Kotlin?

You can combine multiple logical operators using parentheses to control the order of evaluation. For example: (a && b) || !c.

What is the result of true && false in Kotlin?

A false

B true

C null

D Error

The AND operator (&&) returns true only if both sides are true. Here, one side is false, so the result is false.

What does !true evaluate to in Kotlin?

A false

B true

C null

D Error

The NOT operator (!) reverses the Boolean value. So !true becomes false.

Which operator returns true if at least one operand is true?

A &&

B !

C ||

D ==

The OR operator (||) returns true if any operand is true.

What is the type of the expression true || false in Kotlin?

A Int

B String

C Unit

D Boolean

Logical operators return Boolean values, so the type is Boolean.

How do you write a logical expression that is true only if both a and b are true?

A a || b

B a && b

C !a && b

D a != b

The AND operator (&&) returns true only if both operands are true.

Describe the Boolean type and the three main logical operators in Kotlin.

Think about how true and false values combine with AND, OR, and how NOT flips a value.

Explain how to combine multiple logical operators in Kotlin and why parentheses might be important.

Consider how math uses parentheses to decide what to do first.