package org.hin.Lekse.Oblig2;

/**
 * @author Fredrik Hauger Olsen
 */

import javax.swing.JOptionPane;

public class MånedligeBetalinger {

    public static double monthlyPayment (double loanAmount, double monthlyInterestRate, int years) {
        return loanAmount*monthlyInterestRate/(1-1/(Math.pow(1+monthlyInterestRate, years*12)));
    }

    public static void main(String[] args) {
        double monthlyP, totalP, loanAmount;
        int years;
        JOptionPane p = new JOptionPane();

        try {
        loanAmount = Double.parseDouble(p.showInputDialog(null, "Tast inn lånebeløpet."));
        years = Integer.parseInt(p.showInputDialog(null, "Tast inn antall år for nedbetaling."));
        System.out.println("Rentefot\tMånedlig betaling\tTotalt betalt");
        for(double i=4; i<=9; i+=0.5)
        {
            monthlyP = monthlyPayment(loanAmount, i/100/12, years);
            totalP = monthlyP*12*years;
            System.out.format("%.3f%% \t\t %.2f \t\t %.2f\n", i, monthlyP, totalP);
        }
        } catch (NumberFormatException e) {
            p.showMessageDialog(null, "Du har ikke tastet inn et beløp.");
        }
    }
}