mycalc.java

It is the application for stimulating the calculate different numbers

/**
 * The MyCalc class implements a simple Calculator application.
 * MyCalc uses an operator code to keep track of the operation being
 * performed
 *  - 0 = multiplication
 *  - 1 = division
 *  - 2 = subtraction
 *  - 3 = addition
 *  - 4 = raise a number to the power of the second number
 *  - 5 = the result of the operator acting on the two numbers
 *        as a result of the equals button being pressed
 *
 *
 * Copyright (c) 2002-2003 Advanced Applications Total Applications Works.
 * (AATAW)  All Rights Reserved.
 *
 * AATAW grants you ("Licensee") a non-exclusive, royalty free, license to use,
 * modify and redistribute this software in source and binary code form,
 * provided that i) this copyright notice and license appear on all copies of
 * the software; and ii) Licensee does not utilize the software in a manner
 * which is disparaging to AATAW.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. AATAW AND ITS LICENSORS SHALL NOT BE
 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL AATAW OR ITS
 * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
 * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * This software is not designed or intended for use in on-line control of
 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
 * the design, construction, operation or maintenance of any nuclear
 * facility. Licensee represents and warrants that it will not use or
 * redistribute the Software for such purposes.
 *
 *
 */

import java.awt.*;
import java.awt.event.*;
import javax.swing.* ;
import javax.swing.JOptionPane ;
import java.io.*;

public class MyCalc extends JFrame
                implements ActionListener {

   private JButton bOne, bTwo, bThree, bFour, bFive,
                   bSix, bSeven, bEight, bNine,  bZero, bExit,
                   bMult, bDiv, bSub, bPlus, bCEnt, bCAll, bEquals,
                   bPlusMinus, bExp, bMPlus, bMMinus, bHelp,
                   bFact, bAbout, bOneDivX, bSqrt, bDecPt ;
   private JTextField enterBox ;
   private JPanel textPanel, exitPanel, buttonPanel, functionPanel ;
   private Container c ;
   private Font         font;
   private String firstNum = new String(""), secondNum  = new String(""), tempStr ;
   private boolean myDiag = false, result = true ,
                   firstNumSet = false, secondNumSet = false,
                   pendingOp  = false ;
   private double aNum, dNum1 = 0.0, dNum2 = 0.0 , answer = 0.0,
                   tempD = 0.0 , minusOne = -1.0 ;
   private double dArray[] = new double[ 10 ]  ;
   private int opCode = -1, tempInt = 0, tempInt2 = 0,
                 dArrayPtr = 0, pendingOpCode = -1 ;

   /**  MyCalc() - constructor used for initialization */
   MyCalc() {

      super( "Calculator" );
      setup() ;

      setSize( 350, 300 );      /** sets the size of the frame */
      setLocation( 200, 200 ) ; /** sets the location of the frame on the screen*/
      show();                   /** makes the frame visible */
   }

   /**
    * The setup() method is used to allocate the panel and
    * button objects using the new function.
    */
   private void setup()   {
      c = getContentPane() ;


      /** setup text field and panel */
      enterBox  = new JTextField( 15 ) ;
      enterBox.setText( "..........." );
      enterBox.setEditable( false );
      enterBox.setBackground( Color.white );
      enterBox.setHorizontalAlignment( JTextField.RIGHT );
      enterBox.addKeyListener(
      /** this code reprimes the enterbox and avoids exceptions */
         new KeyAdapter() {
            public void keyPressed ( KeyEvent e )   {
               if ( result ) {
                  MyPrint( "The value of result is " + result +
                   "this is from the enterbox keylistener." );
                  result = false ;
                  enterBox.setText( "" );
               }
            }
         }
      );
      textPanel = new JPanel() ;
      textPanel.add(enterBox ) ;

      c.add( textPanel , BorderLayout.NORTH ) ;

      /** setup button Panel and the number buttons */
      buttonPanel = new JPanel() ;
      c.add( buttonPanel , BorderLayout.CENTER ) ;

      bZero   = new JButton( "0" ) ;
      bZero.setFont( new Font("Sanserif", Font.BOLD, 16 ) );
      bOne    = new JButton( "1" ) ;
      bTwo    = new JButton( "2" ) ;
      bThree  = new JButton( "3" ) ;
      bFour   = new JButton( "4" ) ;
      bFive   = new JButton( "5" ) ;
      bSix    = new JButton( "6" ) ;
      bSeven  = new JButton( "7" ) ;
      bEight  = new JButton( "8" ) ;
      bNine   = new JButton( "9" ) ;
      bExit   = new JButton( "Exit" ) ;
      bMult   = new JButton( "*" ) ;
      bMult.setFont( new Font("Sanserif", Font.BOLD, 20 ) );
      bDiv    = new JButton( "/" ) ;
      bDiv.setFont( new Font("Sanserif", Font.BOLD, 20 ) );
      bSub    = new JButton( "-" ) ;
      bSub.setFont( new Font("Sanserif", Font.BOLD, 24 ) );
      bPlus   = new JButton( "+" ) ;
      bPlusMinus = new JButton( "+/-" ) ;
      bPlusMinus.setFont( new Font("Sanserif", Font.BOLD, 16 ) );
      bEquals = new JButton( "=" ) ;
      bEquals.setFont( new Font("Sanserif", Font.BOLD, 16 ) );
      bPlus = new JButton( "+" ) ;
      bPlus.setFont( new Font("Sanserif", Font.BOLD, 16 ) );
      bExp = new JButton( "Pow" ) ;
      bExp.setFont( new Font("Sanserif", Font.BOLD, 12 ) );
      bOneDivX = new JButton( "1/x" ) ;
      bOneDivX.setFont( new Font("Sanserif", Font.BOLD, 16 ) );
      bSqrt = new JButton( "SQRT" ) ;
      bSqrt.setFont( new Font("Sanserif", Font.BOLD, 12 ) );
      bDecPt = new JButton( "." ) ;
      bDecPt.setFont( new Font("Sanserif", Font.BOLD, 22 ) );

      /** assign an event handler to the button and
       *  indicate that the responses will be handled
       *  inside this class, MyCalc. */
      bZero.addActionListener( this );
      bOne.addActionListener( this );
      bTwo.addActionListener( this );
      bThree.addActionListener( this );
      bFour.addActionListener( this );
      bFive.addActionListener( this );
      bSix.addActionListener( this );
      bSeven.addActionListener( this );
      bEight.addActionListener( this );
      bNine.addActionListener( this );
      bExit.addActionListener( this );
      bMult.addActionListener( this );
      bDiv.addActionListener( this );
      bSub.addActionListener( this );
      bPlus.addActionListener( this );
      bPlusMinus.addActionListener( this );
      bEquals.addActionListener( this );
      bExp.addActionListener( this );
      bOneDivX.addActionListener( this );
      bSqrt.addActionListener( this );
      bDecPt.addActionListener( this );

      /** add the following buttons to the buttonPanel panel. */
      buttonPanel.add( bSeven ) ;
      buttonPanel.add( bEight ) ;
      buttonPanel.add( bNine ) ;
      buttonPanel.add( bMult ) ;

      buttonPanel.add( bFour ) ;
      buttonPanel.add( bFive ) ;
      buttonPanel.add( bSix ) ;
      buttonPanel.add( bDiv ) ;

      buttonPanel.add( bOne ) ;
      buttonPanel.add( bTwo ) ;
      buttonPanel.add( bThree ) ;
      buttonPanel.add( bSub ) ;

      buttonPanel.add( bPlusMinus ) ;
      buttonPanel.add( bZero ) ;
      buttonPanel.add( bDecPt ) ;
      buttonPanel.add( bPlus ) ;

      buttonPanel.add( bExp );
      buttonPanel.add( bOneDivX );
      buttonPanel.add( bSqrt );
      buttonPanel.add( bEquals ) ;

      buttonPanel.setLayout( new GridLayout( 6, 5, 5, 5  ) );

      /** setup function panel and its buttons*/
      functionPanel = new JPanel() ;
      c.add( functionPanel , BorderLayout.EAST ) ;
      functionPanel.setLayout( new GridLayout( 6, 1, 5, 3  ) );

      bCEnt   = new JButton( "CE" ) ;
      bCEnt.setFont( new Font("Sanserif", Font.BOLD, 14 ) );
      bCAll   = new JButton( "CA" ) ;
      bCAll.setFont( new Font("Sanserif", Font.BOLD, 14 ) );
      bMPlus  = new JButton( "M+" ) ;
      bMPlus.setFont( new Font("Sanserif", Font.BOLD, 14 ) );
      bMMinus = new JButton( "M-" ) ;
      bMMinus.setFont( new Font("Sanserif", Font.BOLD, 14 ) );
      bFact = new JButton( "! n" ) ;
      bFact.setFont( new Font("Sanserif", Font.BOLD, 20 ) );


      /** add the following buttons to the functionPanel panel. */
      functionPanel.add( bCEnt ) ;
      functionPanel.add( bCAll );
      functionPanel.add( bMPlus );
      functionPanel.add( bMMinus );
      functionPanel.add( bFact );


      bCEnt.addActionListener( this );
      bCEnt.setBackground( Color.blue ) ;
      bCEnt.setForeground( Color.white );
      bCAll.addActionListener( this );
      bCAll.setBackground( Color.blue ) ;
      bCAll.setForeground( Color.white );
      bMPlus.addActionListener( this );
      bMPlus.setBackground( Color.blue ) ;
      bMPlus.setForeground( Color.white );
      bMMinus.addActionListener( this );
      bMMinus.setBackground( Color.blue ) ;
      bMMinus.setForeground( Color.white );
      bFact.addActionListener( this );
      bFact.setBackground( Color.blue ) ;
      bFact.setForeground( Color.white );


      /** setup exit panel and its buttons */
      exitPanel = new JPanel() ;
      c.add( exitPanel , BorderLayout.SOUTH ) ;
      bExit   = new JButton( "Exit" ) ;
      bExit.setFont( new Font("Sanserif", Font.BOLD, 16 ) );
      bExit.setBackground( Color.red ) ;
      bExit.setForeground( Color.white );
      bHelp   = new JButton( "Help" ) ;
      bHelp.setFont( new Font("Sanserif", Font.BOLD, 16 ) );
      bHelp.setBackground( Color.blue ) ;
      bHelp.setForeground( Color.white );
      bAbout = new JButton( "About" ) ;
      bAbout.setFont( new Font("Sanserif", Font.BOLD, 14 ) );
      bAbout.setBackground( Color.darkGray ) ;
      bAbout.setForeground( Color.white );

      /** add the following buttons to the exitPanel panel. */
      exitPanel.add( bExit ) ;
      exitPanel.add( bHelp ) ;
      exitPanel.add( bAbout ) ;

      bExit.addActionListener( this );
      bHelp.addActionListener( this );
      bAbout.addActionListener( this );

   }

   /** This is the method that is called to respond to a button event */
   public void actionPerformed( ActionEvent e )    {
      if ( result ) {
         /** If result =s true, set the text field to vlank */
         MyPrint( "The value of result is " + result );
         result = false ;
         enterBox.setText( "" );
      }

      if ( !pendingOp && opCode == 99 ) {
         /** If opCode =s 99, then the =s button was pressed */
         enterBox.setText( "" );
         MyPrint( "The value of opCode is " + opCode );
         pendingOpCode = -1 ;
         firstNumSet = false ;
         firstNum = "" ;
      }

      if ( e.getSource() == bDecPt ) {
         MyPrint( "The decimal point button was pressed." );
         enterBox.setText( enterBox.getText() + "." ) ;
      }
      else if ( e.getSource() == bZero ) {
         MyPrint( "The zero button was pressed. And pendingOp is " + pendingOp );
         enterBox.setText( enterBox.getText() + "0" ) ;
      }
      else  if ( e.getSource() == bOne ) {
         MyPrint( "The one button was pressed. And pendingOp is " + pendingOp  );
         enterBox.setText( enterBox.getText() + "1" ) ;
      }
      else  if ( e.getSource() == bTwo ) {
         MyPrint( "The two button was pressed. And pendingOp is " + pendingOp );
         enterBox.setText( enterBox.getText() + "2" ) ;
      }
      else  if ( e.getSource() == bThree ) {
         MyPrint( "The Three button was pressed. And pendingOp is " + pendingOp);
         enterBox.setText( enterBox.getText() + "3" ) ;
      }
      else  if ( e.getSource() == bFour ) {
         MyPrint( "The Four button was pressed. And pendingOp is " + pendingOp );
         enterBox.setText( enterBox.getText() + "4" ) ;
      }
      else  if ( e.getSource() == bFive ) {
         MyPrint( "The Five button was pressed. And pendingOp is " + pendingOp );
         enterBox.setText( enterBox.getText() + "5" ) ;
      }
      else  if ( e.getSource() == bSix ) {
         MyPrint( "The Six button was pressed. And pendingOp is " + pendingOp );
         enterBox.setText( enterBox.getText() + "6" ) ;
      }
      else  if ( e.getSource() == bSeven ) {
         MyPrint( "The Seven button was pressed. And pendingOp is " + pendingOp );
         enterBox.setText( enterBox.getText() + "7" ) ;
      }
      else  if ( e.getSource() == bEight ) {
         MyPrint( "The Eight button was pressed. And pendingOp is " + pendingOp );
         enterBox.setText( enterBox.getText() + "8" ) ;
      }
      else  if ( e.getSource() == bNine ) {
         MyPrint( "The Nine button was pressed. And pendingOp is " + pendingOp );
         enterBox.setText( enterBox.getText() + "9" ) ;
      }
      else  if ( e.getSource() == bExit ) {
         MyPrint( "The Exit button was pressed." );
         sysExit() ;
      }
      else  if ( e.getSource() == bMult ) {
         MyPrint( "The Mult button was pressed. And pendingOp is " + pendingOp  );
         multOp() ;
      }
      else  if ( e.getSource() == bDiv ) {