How to convert an arithmetic expression of a string type to an integer in Kotlin?

Question

This is my code after running this piece of code, I am getting exception:

    fun main() {
    var str = "(100 + 50)/2"
    
    var sum = str.toInt()
    
    println(sum)
    }

Exception with stack trace is given below:

Exception in thread "main" java.lang.NumberFormatException: For input string: "(100 + 50)/2"
 at java.lang.NumberFormatException.forInputString (:-1) 
 at java.lang.Integer.parseInt (:-1) 
 at java.lang.Integer.parseInt (:-1)

There's no native way to parse a mathematical expression. You need to manually parse it yourself or use a library like exp4j. — Tenfour04
– Tenfour04, Commented Mar 9, 2022 at 13:34
Does this answer your question? How to evaluate a math expression given in string form? — kcode
– kcode, Commented Mar 9, 2022 at 19:06

kcode · Accepted Answer · 2022-03-09 19:05:45Z

1

You cannot evaluate arithmetic in string expressions natively in kotlin or java. Either use a library (like exp4j, Javaluator, and SEpl) or write your own (refer to this thread).

answered Mar 9, 2022 at 19:05

kcode

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