MOCKSTACKS
EN
Questions And Answers

More Tutorials








Kotlin Data types and declaration

Similar to other programming languages, you can define variables in Kotlin which represents a conainer to store data.

In Kotlin, To declare a variable you can either use var or val keywords.

Syntax of Variable Declaration

var variableName = value
val variableName = value

The difference between var and val is that variables declared with the var keyword can be changed/modified, while val variables cannot.

Kotlin does automatically knows that data type of the variable, unlike many other programming language Kotlin does not need to have data type (like Int, String, Bool...) to be specified when declaring a variable.

Example of Kotlin Variable declaration with var

fun main() {
  var name = "John"      // String (text)
  val age = 35          // Int (number)

  println(name)       // Print the value of name
  println(age)       // Print the value of age
}

Output

Jhon
35


Example of Kotlin Variable declaration with val

fun main() {
  val name = "John"
  name = "William"
  println(name)
}

Output

error: val cannot be reassigned
name = "William"
^

Conclusion

In this page (written and validated by ) you learned about Kotlin Data types and declaration . What's Next? If you are interested in completing Kotlin tutorial, your next topic will be learning about: Kotlin Declare constant.



Incorrect info or code snippet? We take very seriously the accuracy of the information provided on our website. We also make sure to test all snippets and examples provided for each section. If you find any incorrect information, please send us an email about the issue: mockstacks@gmail.com.


Share On:


Mockstacks was launched to help beginners learn programming languages; the site is optimized with no Ads as, Ads might slow down the performance. We also don't track any personal information; we also don't collect any kind of data unless the user provided us a corrected information. Almost all examples have been tested. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. By using Mockstacks.com, you agree to have read and accepted our terms of use, cookies and privacy policy.