Kotlin String to Integer And Calculate-CodePudding

I am dealing with the following code

fun main()
{
    var exp = "11 2"
    println(exp) // first statement
    println(exp.toInt()) // Second Statement
}

When I run the above code, My Aim to display the output, as 

11 2 // here 11 2 is a String
13 // Here the output I should get is 13 by adding 11 2 during run time, since I am converting the 11 2 to Integer, But I am getting error as

11 2
Exception in thread "main" java.lang.NumberFormatException: For input string: "11 2"
 at java.lang.NumberFormatException.forInputString (:-1) 
 at java.lang.Integer.parseInt (:-1) 
 at java.lang.Integer.parseInt (:-1)

Can anyone Solve or provide solution to add during run time and get 13 as result.

CodePudding user response：

Till date , it is not possible natively in kotlin. We have to code manually to evaluate arithmetic in string expressions like above. You can refer this link for reference.

CodePudding user response：

The actual process to convert a string is the next :

val intValue = "16".toInt()
assertEquals(16, intValue)

The opertaion you're trying to perform will require a concat once is converted, so to complete the real output would require to make 2 operation for each number indivual.

You can take a look to the documentation to understand how it works https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/to-int.html