C6X13_Newton.java

//Newton.java   MrG 2012.0119
public class Newton
{
    private double a;
    private int n;
    private double eps;
    private double oldGuess;
    private double newGuess;

    public Newton(double a, int n, double eps)
    {
        this.a = a;
        this.n = n;
        this.eps = eps;
        oldGuess = 1;
        newGuess = 1;
    }

    public boolean hasMoreGuesses()
    {
        return Math.abs(oldGuess-newGuess)>eps;
    }

    public double nextGuess()
    {
        oldGuess = newGuess;
        newGuess = oldGuess - (Math.pow(oldGuess,n)-a)/(n*Math.pow(oldGuess,n-1));
        return newGuess;
    }
}