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URGENT Help With Scientific Calculator!

1 reply on 1 page. Most recent reply: Dec 16, 2003 1:31 AM by Sunitha C S

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Maria

Posts: 2
Nickname: laurare
Registered: Dec, 2003

URGENT Help With Scientific Calculator! Posted: Dec 13, 2003 12:30 PM
Reply to this message Reply
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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


// 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() );
}
}

}


Sunitha C S

Posts: 20
Nickname: sunics
Registered: Dec, 2003

Re: URGENT Help With Scientific Calculator! Posted: Dec 16, 2003 1:31 AM
Reply to this message Reply
Hi maria,

If you want to find the Sin of a value typed in the text firld, its simple as get the value from text field. suppose value is in X. you can find the sin by calling Math.sin(X).


if u wish this prog to work both as application and applet, then u write a main function where u generate an instance of the same class and show that.



if you want the buttons to be arranged, u just make some layout managers or make layout null and place to controls by setting the bounds by setBounds(x,y,w,h)

good luck
sunitha

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