Kotlin - 숫자타입(Number Type), Inheritors, 언더바(Underscore) 삽입

 

 

숫자타입(Number Type)

·         Int, Double, Float, Long, Short, Byte 타입을 제공합니다.

·         Int, Double, Float, Long, Short, Byte 클래스이며 이 타입을 명시하여 선언한 변수는 그자체로 객체(object)입니다.

·         자동형변형(implicit conversions for number)을제공하지않는다.

·         숫자타입에서 8진수를 지원하지 않습니다.

 

Type	Bit Width
Double	64
Float	32
Long	64
Int	32
Short	16
Byte	8

 

 

 

http://bit.ly/2yJ4typ

 

 

Inheritors

숫자타입의 클래스들은 모두 Number 타입의 서브클래스 입니다.

Byte	class Byte : Number, Comparable<Byte> Represents a 8-bit signed integer. On the JVM, non-nullable values of this type are represented as values of the primitive type byte.
Double	class Double : Number, Comparable<Double> Represents a double-precision 64-bit IEEE 754 floating point number. On the JVM, non-nullable values of this type are represented as values of the primitive type double.
Float	class Float : Number, Comparable<Float> Represents a single-precision 32-bit IEEE 754 floating point number. On the JVM, non-nullable values of this type are represented as values of the primitive type float.
Int	class Int : Number, Comparable<Int> Represents a 32-bit signed integer. On the JVM, non-nullable values of this type are represented as values of the primitive type int.
Long	class Long : Number, Comparable<Long> Represents a 64-bit signed integer. On the JVM, non-nullable values of this type are represented as values of the primitive type long.
Short	class Short : Number, Comparable<Short> Represents a 16-bit signed integer. On the JVM, non-nullable values of this type are represented as values of the primitive type short.

http://bit.ly/2DWdPwD

 

 

 

 

언더바(Underscore) 삽입

숫자타입으로 대입되는 데이터에 언더바(Underscore)를 중간에 삽입할 수 있습니다.

val oneMillion: Int = 1_000_000

println(oneMillion) // 1000000