Convert number to text in Kotlin | Int → String

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Convert number to text in Kotlin | Int → String

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Convert number to text in Kotlin | Int → String

last updated: 2 May 2024

Example 1. toString()

Kotlin

val age:Int = 45
var myText:String = age.toString()
// myText = "45"

Example 2. String.format("%02d", number)
The text will be made with a minimum of 2 digits

Kotlin

var myText:String = ""

myText = String.format("%02d", 1)
// myText = 01

myText = String.format("%02d", 7)
// myText = 07

myText = String.format("%02d", -3)
// myText = -3

myText = String.format("%02d", 15)
// myText = 15

myText = String.format("%02d", 34)
// myText = 34

myText = String.format("%02d", 179)
// myText = 179

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The symbol in Kotlin is: Char

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The string, the text in Kotlin is: String

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Объявления

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 };

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