Hi everybody,

I designed a calculator, and I need help with the rest of
the actions.  I know I need to use the different Math
methods, but I tried that and it didn't work.  Also,
it needs to work as an applet and application, and in the
applet, the buttons don't appear in order, how can I fix
that?

I will really appreciate your help with this program, I
can't get it to work and I'm frustrated, I need to finish
this for next Tuesday 16th.  Please e-mail me at
laurare@rocketmail.com.

Below is the code for the calcualtor.

Thanks a lot!

-Maria

[code]
// calculator
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

public class calculator extends JApplet implements
ActionListener
{
 private JButton one, two, three, four, five, six, seven,
 eight, nine, zero, dec, eq, plus, minus, mult, div,
clear,
 mem, mrc, sin, cos, tan, asin, acos, atan, x2, sqrt, exp,
pi, percent;
 private JLabel output, blank;
 private Container container;
 private String operation;
 private double number1, number2, result;
 private boolean clear = false;
 
 //GUI
 public void init()
 {
   
   container = getContentPane();
   //Title
   //super("Calculator");
   JPanel container = new JPanel();   
   container.setLayout( new FlowLayout( FlowLayout.CENTER
) );
   
   output = new JLabel("");   
   output.setBorder(new MatteBorder(2,2,2,2,Color.gray));
   output.setPreferredSize(new Dimension(1,26));   
   getContentPane().setBackground(Color.white);   
   getContentPane().add( "North",output );   
   getContentPane().add( "Center",container );
   
   //blank
   blank = new JLabel( "                    " );
   container.add( blank );
   
   //clear
   clear = new JButton( "CE" );
   clear.addActionListener(this);
   container.add( clear );
   
   //seven
   seven = new JButton( "7" );
   seven.addActionListener(this);
   container.add( seven );

   
   //eight
   eight = new JButton( "8" );
   eight.addActionListener(this);
   container.add( eight );
   
   //nine
   nine = new JButton( "9" );
   nine.addActionListener(this);
   container.add( nine );
   
   //div
   div = new JButton( "/" );
   div.addActionListener(this);
   container.add( div );
   
   //four
   four = new JButton( "4" );
   four.addActionListener(this);
   container.add( four );
   
   //five
   five = new JButton( "5" );
   five.addActionListener(this);
   container.add( five );
   
   //six
   six = new JButton( "6" );
   six.addActionListener(this);
   container.add( six );
   
   //mult
   mult = new JButton( "*" );
   mult.addActionListener(this);
   container.add( mult );
   
   //one
   one = new JButton( "1" );
   one.addActionListener(this);
   container.add( one );
   
   //two
   two = new JButton( "2" );
   two.addActionListener(this);
   container.add( two );
   
   //three
   three = new JButton( "3" );
   three.addActionListener(this);
   container.add( three );
   
   //minus
   minus = new JButton( "-" );
   minus.addActionListener(this);
   container.add( minus );
   
   //zero
   zero = new JButton( "0" );
   zero.addActionListener(this);
   container.add( zero );
   
   //dec
   dec = new JButton( "." );
   dec.addActionListener(this);
   container.add( dec );
   
   //plus
   plus = new JButton( "+" );
   plus.addActionListener(this);
   container.add( plus );

   //mem
   mem = new JButton( "MEM" );
   mem.addActionListener(this);
   container.add( mem );    

   //mrc
   mrc = new JButton( "MRC" );
   mrc.addActionListener(this);
   container.add( mrc );

   //sin
   sin = new JButton( "SIN" );
   sin.addActionListener(this);
   container.add( sin );

   //cos
   cos = new JButton( "COS" );
   cos.addActionListener(this);
   container.add( cos );
 
   //tan
   tan = new JButton( "TAN" );
   tan.addActionListener(this);
   container.add( tan );
   
   //asin
   asin = new JButton( "ASIN" );
   asin.addActionListener(this);
   container.add( asin );

   //acos
   acos = new JButton( "ACOS" );
   cos.addActionListener(this);
   container.add( cos );
 
   //atan
   atan = new JButton( "ATAN" );
   atan.addActionListener(this);
   container.add( atan );

   //x2
   x2 = new JButton( "X2" );
   x2.addActionListener(this);
   container.add( x2 );

   //sqrt
   sqrt = new JButton( "SQRT" );
   sqrt.addActionListener(this);
   container.add( sqrt );

   //exp
   exp = new JButton( "EXP" );
   exp.addActionListener(this);
   container.add( exp );

   //pi
   pi = new JButton( "PI" );
   pi.addActionListener(this);
   container.add( pi );

   //percent
   percent = new JButton( "%" );
   percent.addActionListener(this);
   container.add( percent );

   //eq
   eq = new JButton( "=" );
   eq.addActionListener(this);
   container.add( eq );

   //Set size and visible
   setSize( 190, 285 );
   setVisible( true );
 }
 

public static void main(String args[]){
   //execute applet as application

    //applet's window
    JFrame applicationWindow = new JFrame("calculator");
   
applicationWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    //applet instance
    calculator appletObject = new calculator();
   
    //init and start methods
    appletObject.init();
    appletObject.start();

 } // end main

 public void actionPerformed(ActionEvent ae)
 {   
   JButton but = ( JButton )ae.getSource();   

   //dec action
   if( but.getText() == "." )
   {
     //if dec is pressed, first check to make shure there
is not already a decimal
     String temp = output.getText();
     if( temp.indexOf( '.' ) == -1 )
       output.setText( output.getText() + but.getText() );
   }
   
   //clear action
   else if( but.getText() == "CE" )
   {
     output.setText( "" );
     operation = "";
     number1 = 0.0;
     number2 = 0.0;
   }
   
   //plus action
   else if( but.getText() == "+" )
   {
     operation = "+";
     number1 = Double.parseDouble( output.getText() );
     clear = true;
     //output.setText( "" );
   }
   
   //minus action
   else if( but.getText() == "-" )
   {
     operation = "-";
     number1 = Double.parseDouble( output.getText() );
     clear = true;
     //output.setText( "" );
   }
   
   //mult action
   else if( but.getText() == "*" )
   {
     operation = "*";
     number1 = Double.parseDouble( output.getText() );
     clear = true;
     //output.setText( "" );
   }
   
   //div action
   else if( but.getText() == "/" )
   {
     operation = "/";
     number1 = Double.parseDouble( output.getText() );
     clear = true;
     //output.setText( "" );
   }
   
   //eq action
   else if( but.getText() == "=" )
   {
     number2 = Double.parseDouble( output.getText() );
     if( operation == "+" )
       result = number1 + number2;
     else if( operation == "-" )
       result = number1 - number2;
     else if( operation == "*" )
       result = number1 * number2;
     else if( operation == "/" )
       result = number1 / number2;        

     //output result
     output.setText( String.valueOf( result ) );
     
     clear = true;
     operation = "";
   }
   

   //default action
   else
   {
     if( clear == true )
     {
       output.setText( "" );
       clear = false;
     }
     output.setText( output.getText() + but.getText() );
   }
 }
 
}
[/code]