Secant

package metodenumerik;

/**
 * @author Kelompok3_RK_3IA14
 **/
public class Secant {

    public static void main(String[] args) {

        float xn2 = 2;
        float xn1 = 1;
        float x = 9999;
        float selisih = x - xn1;
        float error = 0;
        String prefix1 = "X";
        String prefix2 = "Selisih";
        String format = "%-14s%s%n";

        System.out.printf(format, prefix1, " | " + prefix2);
        System.out.println("-----------------------------");
        System.out.printf(format, xn2, " | " + 0);
        System.out.printf(format, xn1, " | " + selisih);

        while(Math.abs(selisih) > error){

            x = xn1 - ((fungsi(xn1) * (xn1-xn2)) / (fungsi(xn1) - fungsi(xn2)));

            selisih = x - xn1;
            System.out.printf(format, x, " | " + selisih);

            xn2 = xn1;
            xn1 = x;

        }
            String prefix3 = "Akar Persamaan";
            String prefix4 = "Error";
            float absolute = Math.abs(selisih);
            System.out.println("-----------------------------");
            System.out.printf(format, prefix3, " : " + x);
            System.out.printf(format, prefix4, " : " + absolute);

    }

    public static float fungsi(float x){
        //fungsi ini bisa diganti dengan fungsi apa pun
        float y = (x*x)-(7*x)-7;
        return y;
    }
}