Integer numbers in Kotlin are: Byte, UByte, Short, UShort, Int, UInt, Long, ULong

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Integer numbers in Kotlin are: Byte, UByte, Short, UShort, Int, UInt, Long, ULong

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Integer numbers in Kotlin are: Byte, UByte, Short, UShort, Int, UInt, Long, ULong

last updated: 15 January 2025

Example: Int

Kotlin

val myPrice:Int = 10 // val означает что НЕ МОЖЕМ менять переменную потом
var myWeight:Int = 65 // var означает что можем менять переменную потом

How much space do they take:

Type

min ... max value range

Amount of memory occupied

Example

Byte

-128 ... 127

1 byte

Kotlin

var myPrice:Byte = 10

UByte

0 ... 255

1 byte

Kotlin

var myPrice:UByte = 10u

Short

-32768 ... 32767

2 bytes

Kotlin

var myPrice:Short = 10

UShort

0 ... 65535

2 bytes

Kotlin

var myPrice:UShort = 10u

Int

-2 147 483 648 ... 2 147 483 647

4 bytes

Kotlin

var myPrice:Int = 10

UInt

0 ... 4 294 967 295

4 bytes

Kotlin

var myPrice:UInt = 10u

Long

-9 223 372 036 854 775 808 ... 9 223 372 036 854 775 807

8 bytes

Kotlin

var myPrice:Long = 10

ULong

0 ... 18 446 744 073 709 551 615

8 bytes

Kotlin

var myPrice:ULong = 10u

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Decimal numbers in Kotlin are: Float, Double

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Объявления

• What is Kotlin?

• Why is IntelliJ IDEA the most popular development environment for Kotlin?

• Download and install IntelliJ IDEA to explore Kotlin

• Create a new project in IntelliJ IDEA for study Kotlin

Int, Float, Boolean, Char ...

• Integer numbers in Kotlin are: Byte, UByte, Short, UShort, Int, UInt, Long, ULong

• Decimal numbers in Kotlin are: Float, Double

• A flag with values of true or false in Kotlin is: Boolean

• The symbol in Kotlin is: Char

• Convert number to text in Kotlin | Int → String

String

• The string, the text in Kotlin is: String

• Interpolate strings in Kotlin. Example: val address:String = "${street}, ${country}"

• What is the difference between String and StringBuilder ?

Enum

• What is an enumeration (enum) in Kotlin ?

• How do I find enum by value in Kotlin ?

Class

• What is class in Kotlin? Example: class MyBook { ... }

• lateinit is a late initialization for the class field | Kotlin

• class that inherits from interface in Kotlin | Example: class MyBook : IBook { ...}

• Unnamed class that inherits from interface in Kotlin | Example: val book1 = object : IBook { ...}

• Generic, template class in Kotlin | Example: class MyBook<T> { ... }

Collections and Arrays

• Create collections list, set, map and an array array in Kotlin

null

• null value, use the symbol ? and ?. and !! and ?: and !!. and ?. in Kotlin

Lambda function

• Lambda function in Kotlin. Example 1: var myFunc1 : (a:Int, b:Int) -> Int = { p1, p2 -> p1 + p2 };