Boolean and Char

Learn Boolean and Char types.

Boolean and Char

Boolean takes only two values: true and false. It is used in conditions (if, while) and logical expressions.

Char represents a single Unicode character and is written between single quotes: 'A', '7', '\n'. Char is not a number; to get a character's code you use the code property.

val active: Boolean = true
val letter: Char = 'K'
println(letter.code)   // 75

Exercise Char code

Write a fun main(). Declare val letter: Char = 'K'. Print the character's code with println(letter.code).

Show example solution

fun main() {
    val letter: Char = 'K'
    println(letter.code)
}

Char vs String

Char represents one character; String represents zero or more characters. 'A' is a Char; "A" is a String with one character. These are different types and behave differently in arithmetic.

Char + Char produces an Int; String + String concatenates. Mixing them creates compile errors or unexpected behavior.

Test yourself

How is a Char written?
- "A"
- A
- 'A'
- (A)
Show answer

'A' — A Char is written between single quotes.

Boolean value

val active: Boolean = ____

Show answer

val active: Boolean = true

Boolean and Char: match the terms

Boolean

true/false
Char

'A'
Int

5
String

"text"

Next lesson: String

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