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

public class RecFact extends java.applet.Applet implements ActionListener
{
    TextField mInstruct, mResults;
    IntField gN;
    Button bFact;                         
   
    public int fact(int n)
    {
        if (n == 0)
        {
            return 1;
        }
        return n * fact(n - 1);
    }
    
    public void init()
    {   
        mInstruct = new TextField(70);
        mInstruct.setText("Enter N, then press button for factorial");
        gN = new IntField(10);
        gN.setLabel("N");
        bFact = new Button("Factorial");
        mResults = new TextField(70);
        add(mInstruct);
        add(gN);
        add(bFact);
        add(mResults);
	bFact.addActionListener(this);
    }           
        
    public void actionPerformed(ActionEvent event)
    {
        int k;
        
        k = gN.getInt();
        mResults.setText(k+" factorial = "+fact(k));
    }
    

}