Java Program to Implement Nth Root Algorithm

This is a Java Program to Implement Nth Root Algorithm. This program is used to calculate n th root of a number x.

Here is the source code of the Java Program to Implement Nth Root Algorithm. The Java program is successfully compiled and run on a Windows system. The program output is also shown below.

/**
 ** Java Program to implement Nth Root Algorithm
 **/
 
import java.util.Scanner;
 
/** Class NthRoot **/
public class NthRoot
{
    public double nthroot(int n, double x) 
    {
        return nthroot(n, x, .0001);
    }
    public double nthroot(int n, double x, double p) 
    {
        if(x < 0) 
        {
            System.err.println("Negative!");
            return -1;
        }
        if(x == 0) 
            return 0;
        double x1 = x;
        double x2 = x / n;  
        while (Math.abs(x1 - x2) > p) 
        {
            x1 = x2;
            x2 = ((n - 1.0) * x2 + x / Math.pow(x2, n - 1.0)) / n;
        }
        return x2;
    }
    /** Main **/
    public static void main(String[] args)
    {
        Scanner scan = new Scanner(System.in);
        System.out.println("Nth Root Algorithm Test\n");
        System.out.println("Enter n and x");
        int n = scan.nextInt();
        double x = scan.nextInt();
        NthRoot nr = new NthRoot();
        double root = nr.nthroot(n, x);
        System.out.println("\nRoot = "+ root);
    }    
}

Output:

Nth Root Algorithm Test
 
Enter n and x
2
3
 
Root = 1.7320508100147274