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

public class SavingsArray2 extends java.applet.Applet
      implements ActionListener
{
    double table [], deposit, value, max, sum;
    int ilook, firstempty, j;
    DoubleField depositF, valueF;
    IntField ilookF, firstemptyF;
    Button b1, b2, b3, b4;


    public void init()
    {
	depositF = new DoubleField(20);
	depositF.setLabel("Deposit");
	ilookF = new IntField(20);
	ilookF.setLabel("i");
	firstemptyF = new IntField(20);
	firstemptyF.setLabel("First empty");
	valueF = new DoubleField(20);
	valueF.setLabel("Value");
	b1 = new Button("Make deposit");
	b1.addActionListener(this);
	b2 = new Button("Check entries");
	b2.addActionListener(this);
	b3 = new Button("Sum deposits");
	b3.addActionListener(this);
	b4 = new Button("Find max");
	b4.addActionListener(this);
	add(ilookF); add(depositF); 
	add(firstemptyF); add(valueF); 
	add(b1); add(b2);  
	add(b3);  add(b4);
        table = new double[100];
	firstempty = 0;
	ilook = 0;
	table[0] = 0;
    }

    public void actionPerformed(ActionEvent event)
    {
	Object cause = event.getSource();
	if (cause == b1)
	{
	    table[firstempty] = depositF.getDouble();
	    firstempty = firstempty + 1;
	    firstemptyF.setInt(firstempty);
	}
	if (cause == b2)
	{
	    ilookF.setInt(ilook);
	    depositF.setDouble(table[ilook]);
	    if ( ilook < firstempty - 1)
	    {
		ilook = ilook + 1;
	    }
	    else
	    {
		ilook = 0;
	    }
	}
	if (cause == b3)
	{
	    sum = 0;
	    j = 0;
	    while (j < firstempty)
	    {
		sum = sum + table[j];
		j = j + 1;
	    }
	    valueF.setDouble(sum);
	}
	if (cause == b4)
	{
	    max = table[0];
	    j = 1;
	    while (j < firstempty)
		{
		    if (table[j] > max)
		    {
			max = table[j];
		    }
		    j = j + 1;
		}
	    valueF.setDouble(max);
	}
    }
}