In this tutorial, we will learn about available Data Types in Kotlin. Data Types are used to refer to the type and size of the value in a variable. The data types in Kotlin are divided into various categories and these categories are as follow: Number Character Boolean Array String Number: This category contains all those data types which can store both normal and decimal number. There is a total of six data types in this category which are as follow: Data Type Memory Size Range Byte 8 bit -128 to 127 Short 16 bit -32768 to 32767 Int 32 bit -2,147,483,648 to 2,147,483,647 Long 64 bit -9,223,372,036,854,775,808 to +9,223,372,036,854,775,807 Float 32 bit 1.40129846432481707e-45 to 3.40282346638528860e+38 Double 64 bit 4.94065645841246544e-324 to 1.79769313486231570e+308 Example Program: un main(args: Array<String>) { val b: Byte = 1 val s: Short = 10 val i: Int = 10000 val l: Long = 100000000 val f: Float = 100.00f val d: Double = 100.00 println(“Byte Value is “+b); println(“Short Value is “+s); println(“Int Value is “+i); println(“Long Value is “+l); println(“Float Value is “+f); println(“Double Value is “+d); } Characters: In Kotlin Char data type is used to define character in variable. Char value should be defined inside single quotes ('a'). Data Type Memory Size Range Char 4 bit -128 to 127 fun main(args: Array<String>) { val gender: Char // defining variable gender = ‘M’ // Assigning value println(“Gender = “+gender) } Boolean: In Boolean data type we can store only two value which are true or false. Data Types Memory Size Values Boolean 1 bit true or false Example Program: fun main(args: Array<String>) { val flag: Boolean // defining variable flag = true // Assinging value println(“Value is “+”$flag”) } Array: In very simple language Array is a collection of homogeneous data elements. Kotlin has Array class to define an array in program. We can us arrayOf() function and Array() constructor to create an Array. Creating an array using arrayOf() function: fun main() { // declaring an array using arrayOf() val numbers = arrayOf(1, 2, 3, 4, 5) for (i in 0..numbers.size-1) { println(numbers[i]) } } Creating an array using Array Constructor: The Array constructor takes two parameters: The size of the array. A function which accepts the index of a given element and returns the initial value of that element. fun main() { val numbers = Array(5, { i -> i * 1 }) for (i in 0..numbers.size-1) { println(numbers[i]) } } String: In Kotlin String is represented as collect of characters. String is immutable in Kotlin like Java. We have two kinds of strings available in Kotlin which are raw String and escaped String. Raw String: We describe raw strings using triple quote (""" """). We can create multi-line strings using raw strings. fun main(args: Array<String>) { var rawString :String = “”” Learn Kotlin On Owlbuddy””” println(rawString) } Escaped String: We describe Escaped strings using double quote (" "). There are various escaped characters available in Kotlin which we can use with Strings like '\n', '\t', '\b' etc. fun main(args: Array<String>) { val escapedString : String = “\nThis is escaped String!\n” println(escapedString) } Parvesh SandilaParvesh Sandila is a passionate web and Mobile app developer from Jalandhar, Punjab, who has over six years of experience. Holding a Master’s degree in Computer Applications (2017), he has also mentored over 100 students in coding. In 2019, Parvesh founded Owlbuddy.com, a platform that provides free, high-quality programming tutorials in languages like Java, Python, Kotlin, PHP, and Android. His mission is to make tech education accessible to all aspiring developers. new.owlbuddy.com
