How to evaluate string that have exponential

Question

Javax ScriptEngine and JEval works similarly, you input an string and send it to be evaluated, and it will return you the result of it:

In ScriptEngine (almost the same in JEval):

System.out.println(engine.eval("2*3+4"));

will result in:

10.0

But when I try to make it an exponential:

System.out.println(engine.eval("2^3+4"));

will result in:

5.0

But it really should result in 12 (2^3 = 8, 8+4=12), so my question is how can I set it up in a way that the string which the will be all the whole equation, will evaluate supporting the exponential, and result correctly?

Should I use another library?

Answer 1

^ is the XOR operand, your string means 2 XOR 3 + 4, which in facts evaluates to 1 + 4.

You have to use

Math.pow(2,3) + 4

This is my code:

System.out.println(engine.eval("Math.pow(2,3) + 4"));

Output:

12.0