How can I incorporate a square root function into this calculator I am trying to make?

Question

I am currently making a simple calculator, and I want to incorporate the square root function into it, currently my code looks like this, but it does not work:

if ("√x".equals(operator))
{
double sqrt = Math.sqrt(num1);
}    

Here Num 1 is the input number, but I am not able to find or come up with code that would √x.

Answer 1

I think Math.sqrt(num1); should work quite good. I suppose you later use the variable 'sqrt', are you sure you are returning it whenever it's needed?