package Lecture3;
import javax.swing.*;

public class Iteration2 {
    public static void main(String[] args) {
        String entrada= JOptionPane.showInputDialog("Introduzca x (0-2)");
        double x= Double.parseDouble(entrada);
        // Calcule 20 términos del 
        // ln x= (x-1) - (x-1)^2/2 + (x-1)^3/3 - ...
        final double TOLERANCIA= 0.00001;
        double logx= 0.0;
        double x1= x-1;
        int i= 1;
        double term= 0.0;  // Defínala fuera de do {}
        do {
            term= Math.pow(x1, i)/i;
            if (i % 2 == 0)     // i par
                logx -= term;
            else
                logx += term;
            i++;
        } while (Math.abs(term) > TOLERANCIA);
        System.out.println("Ln x= " + logx);
        System.out.println("Encontrado en " + i + " iterationes");
        System.exit(0);
    }
}