/*
 * Main.java
 * Created on December 18, 2005, 12:09 PM
 * 
 * 
 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;



public class IntegerCalculator extends JApplet implements ActionListener{
//public class IntegerCalculator extends JApplet {

    /* graphical user interface components  */

        private JLabel label;
	
        private JTextField result;
        private final String names[] = {"7", "8", "9", "4","5","6", "1","2","3","0", "*", "/", "%", "+","-", "=", "AC"};
        private JButton button[];
        private JButton dumy1, dumy2, dumy3,dumy4; 
        private boolean secondN = false; 
        private boolean operator = false; 
        private long n1 = 0, n2 =0 ;
        private String s1, s2;
        private int count = 0, oper = 18;
	private GridLayout grid1;
	private Container container;
   /*  public  void IntegerCalculator() {

     init();

     System.out.println("\n end init \n");
      }
     */

    /** set up GUI components*/

    public void init() {

// set up applet’s GUI

   // obtain content pane and set its layout to FlowLayout
	grid1 = new GridLayout(9, 3, 5, 5);
	
	
	container = getContentPane();
	container.setLayout( grid1 );

	//Container container = getContentPane();
	//container.setLayout( new GridLayout(9, 3, 2, 2) );

      // create numberLabel and attach it to content pane
        label = new JLabel("Basic Calculator", JLabel.CENTER);
	
        container.add(label);
	container.setBackground(Color.gray);
       // container.setForeground(Color.gray);

        result = new JTextField(9);
	//result.setBounds(10,10,50,10); 
        result.setEditable(true);
        container.add(result);
        result.setText("");

      // register this applet as numberField’s ActionListener
      result.addActionListener( this );

      dumy1 = new JButton ("");
      dumy1.addActionListener(this);
      container.add(dumy1);
      dumy1.setVisible(false);
      dumy2 = new JButton ("");
      dumy2.addActionListener(this);
      container.add(dumy2);
      dumy2.setVisible(false);
      dumy3 = new JButton ("");
      dumy3.addActionListener(this);
      container.add(dumy3);
      dumy3.setVisible(false);
      dumy4 = new JButton ("");
      dumy4.addActionListener(this);
      container.add(dumy4);
      dumy4.setVisible(false);

      button = new JButton[names.length];
      for (int i=0; i < names.length; i++){
        button[i] = new JButton (names[i]);
        button[i].addActionListener(this);
        container.add(button[i]);
      }

    setSize( 300, 150 );
    setVisible(true);
    }

public void NumericB (int i){

   String s = new String();

    s = result.getText();
    s = s + String.valueOf(i);

    if (count < 10)
    {
        result.setText(s);
        count++;
    }

}

public void OperatorB (int i)
{
}


public void actionPerformed(ActionEvent e){

    Object src = e.getSource();
    String s = new String( "");

  //  s = result.getText();

    if (src  instanceof JButton)
    {

        if(src == button[0])
	{
	//	result.setText("");	 
                NumericB(7);
	}

        else if(src == button[1])
	{
	//	result.setText(""); 
                NumericB(8);
	}
        else if(src == button[2]) 
	{
	//	result.setText("");
                NumericB(9);
	}
        else if(src ==  button[3])
	{
	//	result.setText(""); 
                NumericB(4);
	}
        else if(src == button[4])
	{
	//	result.setText("");
                NumericB(5);
	}
        else if(src ==  button[5])
	{
	//	result.setText(""); 
                NumericB(6);
	}
        else if(src == button[6])
	{
	//	result.setText("");
                NumericB(1);
	}
        else if(src ==  button[7]) 
	{
	//	result.setText("");
                NumericB(2);
        }
	else if(src ==  button[8])
	{
	//	result.setText("");
                NumericB(3);
	}
        else if(src ==  button[9]) 
	{
	//	result.setText("");
                NumericB(0);
	}
        else if(src ==  button[10]) {   // "*"
        {
	            oper = 11;
                    s = result.getText();
                    n1 = Long.parseLong(s);
                    count = 0;
                    operator = true;
                    result.setText("");
                }
	}
        else if(src ==  button[11] ) {    // "/"
                    oper = 12;
                    n1 = Long.parseLong(result.getText());
                    count = 0;
                    operator = true;
                    result.setText("");
        }
        else if(src ==  button[12] ) {    // "%"
                    oper = 13;
                    n1 = Long.parseLong(result.getText());
                    count = 0;
                    operator = true;
                    result.setText("");
        }
         else if(src ==  button[13] ) {    // "+"
                    oper = 14;
                    n1 = Long.parseLong(result.getText());
                    count = 0;
                    operator = true;
                    result.setText("");
         }
         else if(src ==  button[14] ) {    // "-"
                    n1 = Long.parseLong(result.getText());
                    count = 0;
                    operator = true;
                    result.setText("");
                    oper = 15;
         }

       	 else if(src == button[15]) {    // "="

                    if((operator == true)&&(oper!=0))
                    {
                        s = result.getText();
                        n2 = Long.parseLong(s);
                        makeCalculations();
			oper = 0;
			
                    }
	}
        else if(src == button[16] ) {    // "AC"
                    oper = 17;
                    n1 = Long.parseLong(result.getText());
                    count = 0;
                    operator = true;
                    result.setText("0");
		//button[16].setNextFocusableComponent(result);
        }


	
       

    }
}

private void makeCalculations(){

    long ans=0;
	
	
            switch (oper)
            {
            case 11:
                ans = n1 * n2;
		break;
            case 12:
                ans = n1/n2;
	
                break;
            case 13:
                ans = n1%n2;
                break;
            case 14:
                ans = n1+n2;
                break;
            case 15:
                ans = n1 - n2;
                 break;
            }

   result.setText(String.valueOf(ans));
  }
}