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Kotlin Type Conversion
  • Difficulty Level : Easy
  • Last Updated : 09 May, 2019

Type conversion (also called as Type casting) refers to changing the entity of one data type variable into another data type.

As we know Java supports implicit type conversion from smaller to larger data type. An integer value can be assigned to long data type.
For example:

var myNumber = 100
var myLongNumber: Long = myNumber            // Compiles Successfully

But, Kotlin does not support implicit type conversion. An integer value can not be assigned to long data type.

var myNumber = 100
var myLongNumber: Long = myNumber       // Compiler error
// Type mismatch: inferred type is Int but Long was expected

In Kotlin, helper function can be used to explicitly convert one data type to another to another data type.

For example:



var myNumber = 100
var myLongNumber: Long = myNumber.toLong()     // compiles successfully

The following helper function can be used to convert one data type into another:

  • toByte()
  • toShort()
  • toInt()
  • toLong()
  • toFLoat()
  • toDouble()
  • toChar()

Note: There is No helper function available to convert into boolean type.

Conversion from larger to smaller data type –

var myLongNumber = 10L
var myNumber2: Int = myLongNumber1.toInt()

 
Kotlin Program to convert the one data type into another:




fun main(args: Array<String>)
{
  
    println("259 to byte: " + (259.toByte()))
    println("50000 to short: " + (50000.toShort()))
    println("21474847499 to Int: " + (21474847499.toInt()))
    println("10L to Int: " + (10L.toInt()))
    println("22.54 to Int: " + (22.54.toInt()))
    println("22 to float: " + (22.toFloat()))
    println("65 to char: " + (65.toChar()))
    println("A to Int: " + ('A'.toInt()))
}

Output:

259 to byte: 3
50000 to short: -15536
21474847499 to Int: 11019
10L to Int: 10
22.54 to Int: 22
22 to float: 22.0
65 to char: A
A to Int: 65

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