import awb.*;
import java.awt.*;
import java.awt.event.*;

public class SavingsArray extends java.applet.Applet
				  implements ActionListener
{
	double table[], savings, payment, rate; 
	int year, lastyear;
	DoubleField savingsF, paymentF, rateF;
	IntField yearF, lastyearF;
	Button b1, b2;
	public void init()
	{
		paymentF = new DoubleField(20);
		paymentF.setLabel("payment");
		rateF = new DoubleField(20);
		rateF.setLabel("rate");
		lastyearF = new IntField(20);
		lastyearF.setLabel("last year");
		b1 = new Button("Fill table");
		b1.addActionListener(this);
		b2 = new Button("Check entries");
		b2.addActionListener(this);
		yearF = new IntField(20);
		yearF.setLabel("year");	
		savingsF = new DoubleField(20);
		savingsF.setLabel("savings");
		add(paymentF); add(rateF); add(lastyearF);
		add(b1);  add(b2); add(yearF);  add(savingsF);
		table = new double[100];
	}
	public void actionPerformed(ActionEvent event)
	{	
		Object cause = event.getSource();
		if (cause == b1)
		{
	            payment = paymentF.getDouble();
		    rate = rateF.getDouble();
		    lastyear = lastyearF.getInt();
		    savings = 0;
		    year = 0;
		    while (year < lastyear)
		    {
		        savings = savings + (savings * rate) + payment;
		        table[year] = savings;
		        year = year + 1;
		    }
		    year = 0;
		}
		if (cause == b2)
		{
		      yearF.setInt(year);
		      savingsF.setDouble(table[year]);
		      if (year < lastyear)
		          {year = year + 1;}
		      else
		          {year = 0;}
		}
	}
}