nth root implementation

Question

I am working on a way to calculate the n^th root of a number. However, I am having problems with the n^th root of negative numbers.

Most people s

Answer 1

I use the method below. Maybe it's not the most accurate, but it works well in my case.

public double root(double num, double root) {
    double d = Math.pow(num, 1.0 / root);
    long rounded = Math.round(d);
    return Math.abs(rounded - d) < 0.00000000000001 ? rounded : d;
}