//Calc.java
//Simple Calc game
//User enters in two numbers
//computer calculates results

import java.awt.*;
import java.applet.*;
import java.awt.event.*;

public class Calc extends Applet implements ActionListener{
  
  //input elements 
  TextField txtX = new TextField("0");
  TextField txtY = new TextField("0");
  
  //output elements
  Label lblPlus = new Label("0");
  Label lblMinus = new Label("0");
  Label lblTimes = new Label("0");
  Label lblDiv = new Label("Undefined");


  //button
  Button btnCalc = new Button("Calculate");

  public void init(){

    //set main layout
    setLayout(new BorderLayout());
    Panel pnlCalc = new Panel();
    pnlCalc.setLayout(new GridLayout(3,4));
    pnlCalc.setFont(new Font("SansSerif", Font.BOLD, 20));

    add(pnlCalc, BorderLayout.CENTER);
    Panel pnlButton = new Panel();
    pnlButton.setLayout(new FlowLayout());
    pnlButton.add(btnCalc);
    add(pnlButton, BorderLayout.SOUTH);
    btnCalc.addActionListener(this);

    //first row
    pnlCalc.add(new Label("X"));
    pnlCalc.add(txtX);
    pnlCalc.add(new Label("Y"));
    pnlCalc.add(txtY);

    //second row
    pnlCalc.add(new Label("X + Y"));
    pnlCalc.add(lblPlus);
    pnlCalc.add(new Label("X - Y"));
    pnlCalc.add(lblMinus);

    //third row
    pnlCalc.add(new Label("X * Y"));
    pnlCalc.add(lblTimes);
    pnlCalc.add(new Label("X / Y"));
    pnlCalc.add(lblDiv);

    //set colors
    lblPlus.setBackground(Color.gray);
    lblMinus.setBackground(Color.gray);
    lblTimes.setBackground(Color.gray);
    lblDiv.setBackground(Color.gray);

  } // end init

  public void actionPerformed(ActionEvent e){
    //get x and y values
    Double xWrap = new Double(txtX.getText());
    double x = xWrap.doubleValue();

    Double yWrap = new Double(txtY.getText());
    double y = yWrap.doubleValue();

    String response = "";

    //plus
    response = String.valueOf(x + y);
    lblPlus.setText(response);

    //minus
    response = String.valueOf(x - y);
    lblMinus.setText(response);

    //times
    response = String.valueOf(x * y);
    lblTimes.setText(response);

    //divide
    response = String.valueOf(x / y);
    lblDiv.setText(response);
 
  } // end actionPerformed

} // end class def