* Calculator
* A shareware calculator
*
* @author {@link http://blog.csdn.net/hongweijin Bingbing Li}
*
* @recitation 0101 Matt Carlson
*
* @date 12/7/2005 12:08AM
*
*/
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
public class Calculator extends JFrame implements ActionListener
{
public static final int WIDTH = 800; // width of the window
public static final int HEIGHT = 600; // height of the window
public static final int BUTTON_WIDTH = 80; // width of the buttons
public static final int BUTTON_HEIGHT = 60; // height of the buttons
private CardLayout dealer; // card layout
private JPanel deckPanel; // used to card layout
private JTextField result; // the calculate result
private JCheckBoxMenuItem scientificMode; // the menu item of the mode
private Box vPanel1; // the first line buttons of the
// scientific mode.
private JButton mod; // the modular button
private JButton xey; // the button of Yth root of X
private JButton ms; // save button
private JButton mr; // release the stored value
private JButton mc; // clear the stored value
private double head = 0.0; // the first number of the equation
private double tail = 0.0; // the second number of the equation
private boolean substitution = true; // whether substituted the answer or not
private String operatedCommand = "NOTHING"; // the current operated command
private String preOperatedCommand = "NOTHING"; // remember the pre-operated command
private double variableMemory = 0.0; // the variable of the memory
private JButton jButtonR; // the register's button
private JButton jButtonE; // the edit's button
private JTextField nameField; // the field of the name
private JTextField countryField; // the field of the country
private JTextField zipField; // the field of the zip
private JTextField stateField; // the field of the state
private JTextField cityField ; // the field of the city
private JTextField streetAddressField; // the field of the address
private JTextField first; // the first part of the key
private JTextField second; // the second part of the key
private JTextField third; // the third part of the key
private JTextField fourth; // the fourth part of the key
public Calculator()
{
setSize(WIDTH, HEIGHT);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("Normal Calculator");
Container contentPre = getContentPane(); // the container of the window
dealer = new CardLayout(); // create a new card layout
deckPanel = new JPanel();
deckPanel.setLayout(dealer);
Box content = Box.createVerticalBox(); // create a new vertical Box
Box registration = Box.createVerticalBox();
/****************************************************
* menu
* file
*****************************************************/
JMenu fileMenu = new JMenu("File");
JMenuItem exitItemOfFile = new JMenuItem("Exit");
exitItemOfFile.addActionListener(this);
fileMenu.add(exitItemOfFile);
/**
* menu
* settings
*/
JMenu settingsMenu = new JMenu("Settings");
JMenuItem registrationInfo = new JMenuItem("Registration Info");
registrationInfo.addActionListener(this);
settingsMenu.add(registrationInfo);
scientificMode = new JCheckBoxMenuItem("Scientific Mode");
scientificMode.addActionListener(this);
settingsMenu.add(scientificMode);
JMenuBar jMenuBar = new JMenuBar();
jMenuBar.add(fileMenu);
jMenuBar.add(settingsMenu);
setJMenuBar(jMenuBar);
/****************************************************
* textFiled panel
*****************************************************/
result = new JTextField("0"); // the initiated value of the answer
result.setBackground(Color.CYAN); // set the back ground color with cyan
result.setHorizontalAlignment(JTextField.RIGHT); // set the horizontal alignment
content.add(result);
content.add(paintButtons());
deckPanel.add("cal", content); // add the calculators card to the layout
registration.add(paintRegistration()); // add the register window
deckPanel.add("reg", registration); // add the register window to the layout
contentPre.add(deckPanel); // add the cards to the container
}
/**
* paint the buttons of the two models.
*
*/
public Box paintButtons()
{
/****************************************************
* Buttons
*****************************************************/
/**
* line1
*/
vPanel1 = Box.createVerticalBox();
// add the backwards's button
JButton backwards = new JButton("1/X");
backwards.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
backwards.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
backwards.addActionListener(this);
vPanel1.add(backwards);
// add the factorial button
JButton factorial = new JButton("X!");
factorial.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
factorial.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
factorial.addActionListener(this);
vPanel1.add(factorial);
// add the square's button
JButton square = new JButton("<html>X<sup>2</sup></html>");
square.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
square.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
square.addActionListener(this);
square.setActionCommand("sqr");
vPanel1.add(square);
// add the square root's button
JButton squareRoot = new JButton("/u221a");
squareRoot.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
squareRoot.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
squareRoot.addActionListener(this);
vPanel1.add(squareRoot);
// add the power's button
JButton power = new JButton("<html>X<sup>Y</sup></html>");
power.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
power.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
power.addActionListener(this);
power.setActionCommand("pow");
vPanel1.add(power);
/**
* line2
*/
Box vPanel2 = Box.createVerticalBox();
// add the modular button
mod = new JButton("Mod");
mod.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
mod.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
mod.addActionListener(this);
vPanel2.add(mod);
// add the seven button
JButton seven = new JButton("7");
seven.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
seven.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
seven.addActionListener(this);
vPanel2.add(seven);
// add the four button
JButton four = new JButton("4");
four.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
four.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
four.addActionListener(this);
vPanel2.add(four);
// add the one button
JButton one = new JButton("1");
one.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
one.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
one.addActionListener(this);
vPanel2.add(one);
// add the zero button
JButton zero = new JButton("0");
zero.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
zero.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
zero.addActionListener(this);
vPanel2.add(zero);
/**
* line3
*/
Box vPanel3 = Box.createVerticalBox();
// add the Yth root of X button
xey = new JButton("XeY");
xey.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
xey.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
xey.addActionListener(this);
vPanel3.add(xey);
// add the eight button
JButton eight = new JButton("8");
eight.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
eight.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
eight.addActionListener(this);
vPanel3.add(eight);
// add the five button
JButton five = new JButton("5");
five.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
five.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
five.addActionListener(this);
vPanel3.add(five);
// add the two button
JButton two = new JButton("2");
two.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
two.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
two.addActionListener(this);
vPanel3.add(two);
// add the dot button
JButton dot = new JButton(".");
dot.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
dot.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
dot.addActionListener(this);
vPanel3.add(dot);
/**
* line4
*/
Box vPanel4 = Box.createVerticalBox();
// add the MS button
ms = new JButton("MS");
ms.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
ms.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
ms.addActionListener(this);
vPanel4.add(ms);
// add the nine button
JButton nine = new JButton("9");
nine.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
nine.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
nine.addActionListener(this);
vPanel4.add(nine);
// add the six button
JButton six = new JButton("6");
six.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
six.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
six.addActionListener(this);
vPanel4.add(six);
// add the three button
JButton three = new JButton("3");
three.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
three.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
three.addActionListener(this);
vPanel4.add(three);
// add the plusMinus button
JButton plusMinus = new JButton("/u00b1");
plusMinus.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
plusMinus.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
plusMinus.addActionListener(this);
vPanel4.add(plusMinus);
/**
* line5
*/
Box vPanel5 = Box.createVerticalBox();
// add the MR button
mr = new JButton("MR");
mr.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
mr.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
mr.addActionListener(this);
vPanel5.add(mr);
// add the division button
JButton division = new JButton("/u00F7");
division.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
division.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
division.addActionListener(this);
vPanel5.add(division);
// add the multiplication button
JButton multiplication = new JButton("/u00d7");
multiplication.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
multiplication.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
multiplication.addActionListener(this);
vPanel5.add(multiplication);
// add the subtract button
JButton subtract = new JButton("-");
subtract.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
subtract.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
subtract.addActionListener(this);
vPanel5.add(subtract);
// add the plus button
JButton plus = new JButton("+");
plus.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
plus.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
plus.addActionListener(this);
vPanel5.add(plus);
/**
* line6
*/
Box vPanel6 = Box.createVerticalBox();
// add the MC button
mc = new JButton("MC");
mc.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
mc.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
mc.addActionListener(this);
vPanel6.add(mc);
// add the C button
JButton c = new JButton("C");
c.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
c.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
c.addActionListener(this);
vPanel6.add(c);
// add a vertical strut
Component verticalStrut =
Box.createVerticalStrut(BUTTON_HEIGHT);
vPanel6.add(verticalStrut);
// add the enter button
JButton enter = new JButton("=");
enter.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT * 2));
enter.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT * 2));
enter.addActionListener(this);
vPanel6.add(enter);
/**
* Buttons panel
*/
Box buttonsPanel = Box.createHorizontalBox();
buttonsPanel.add(vPanel1);
buttonsPanel.add(vPanel2);
buttonsPanel.add(vPanel3);
buttonsPanel.add(vPanel4);
buttonsPanel.add(vPanel5);
buttonsPanel.add(vPanel6);
/**********************************************************
* the initial state is normal calculator
***********************************************************/
vPanel1.setVisible(false);
mod.setVisible(false);
xey.setVisible(false);
ms.setVisible(false);
mr.setVisible(false);
mc.setVisible(false);
return buttonsPanel;
}
/**
* paint the registration window.
*
*/
public Box paintRegistration()
{
Box registration = Box.createVerticalBox();
/*
* title
*/
JLabel titleRegistration = new JLabel("Bingbing's Calculator Registration");
registration.add(titleRegistration);
/*
* information
*/
JPanel information = new JPanel();
information.setLayout(new GridLayout(6, 2));
//Name
JLabel name = new JLabel("Name:");
nameField = new JTextField();
information.add(name);
information.add(nameField);
//Street Address
JLabel streetAddress = new JLabel("Street Address:");
streetAddressField = new JTextField();
information.add(streetAddress);
information.add(streetAddressField);
//City
JLabel city = new JLabel("City:");
cityField = new JTextField();
information.add(city);
information.add(cityField);
//State
JLabel state = new JLabel("State:");
stateField = new JTextField();
information.add(state);
information.add(stateField);
//Zip
JLabel zip = new JLabel("Zip:");
zipField = new JTextField();
information.add(zip);
information.add(zipField);
//Country
JLabel country = new JLabel("Country:");
countryField = new JTextField();
information.add(country);
information.add(countryField);
registration.add(information);
/*
* Registration Code
*/
Box registrationCode = Box.createVerticalBox();
JPanel registrationCodePanel = new JPanel();
registrationCodePanel.setLayout(new FlowLayout());
//registrationCodePanel.setTitle("Registration Code");
registrationCodePanel.setBorder(new LineBorder(Color.red, 1));
registrationCode.add(registrationCodePanel);
first = new JTextField(3);
registrationCodePanel.add(first);
JLabel rail1 = new JLabel(" - ");
registrationCodePanel.add(rail1);
second = new JTextField(3);
registrationCodePanel.add(second);
JLabel rail2 = new JLabel(" - ");
registrationCodePanel.add(rail2);
third = new JTextField(3);
JLabel rail3 = new JLabel(" - ");
registrationCodePanel.add(third);
registrationCodePanel.add(rail3);
fourth = new JTextField(3);
registrationCodePanel.add(fourth);
/*
* buttons
*/
JPanel buttonsReg = new JPanel();
buttonsReg.setLayout(new FlowLayout());
jButtonR = new JButton("Register");
jButtonE = new JButton("Edit");
JButton jButtonRe = new JButton("Return");
jButtonR.addActionListener(this);
jButtonE.addActionListener(this);
jButtonRe.addActionListener(this);
buttonsReg.add(jButtonR);
buttonsReg.add(jButtonE);
buttonsReg.add(jButtonRe);
registrationCode.add(buttonsReg);
Box registrationAndPic = Box.createHorizontalBox();
registrationAndPic.add(registrationCode);
jButtonE.setVisible(false);
/*
* image
*/
JLabel imageLabel = new JLabel();
ImageIcon greatwall = new ImageIcon("greatwall.jpg");
imageLabel.setIcon(greatwall);
registrationAndPic.add(imageLabel);
registration.add(registrationAndPic);
return registration;
}
/**
* performe the action which sent by the window.
*
* @param e catch the action event of the window.
*/
public void actionPerformed(ActionEvent e)
{
String actionCommand = e.getActionCommand();
// exit the system
if(actionCommand.equals("Exit"))
System.exit(0);
// return to the calculator
else if(actionCommand.equals("Return"))
{
dealer.show(deckPanel, "cal");
setTitle("Calculator");
validate();
pack();
}
// check the register information
else if(actionCommand.equals("Register"))
{
long check = 0;
Boolean valid = true;
if(nameField.getText().trim().length() != 0)
{
check = calChecksum(nameField.getText().trim());
if(check % 3 != Long.parseLong(first.getText().trim()))
valid = false;
else if(check% 5 != Long.parseLong(second.getText().trim()))
valid = false;
else if(check % 7 != Long.parseLong(third.getText().trim()))
valid = false;
else if(check % 11 != Long.parseLong(fourth.getText().trim()))
valid = false;
// if the information is valid, we will change the buttons
// and set the text field uneditable.
if(valid)
{
jButtonE.setVisible(true);
jButtonR.setVisible(false);
nameField.setEditable(false);
countryField.setEditable(false);
zipField.setEditable(false);
stateField.setEditable(false);
cityField.setEditable(false);
streetAddressField.setEditable(false);
first.setEditable(false);
second.setEditable(false);
third.setEditable(false);
fourth.setEditable(false);
validate();
}
}
}
// make the text field editable
else if(actionCommand.equals("Edit"))
{
jButtonE.setVisible(false);
jButtonR.setVisible(true);
nameField.setEditable(true);
countryField.setEditable(true);
zipField.setEditable(true);
stateField.setEditable(true);
cityField.setEditable(true);
streetAddressField.setEditable(true);
first.setEditable(true);
second.setEditable(true);
third.setEditable(true);
fourth.setEditable(true);
validate();
}
// turn to registration window
else if(actionCommand.equals("Registration Info"))
{
dealer.show(deckPanel, "reg");
setTitle("Registration");
validate();
pack();
}
// turn to scientific model
else if(actionCommand.equals("Scientific Mode"))
{
dealer.show(deckPanel, "cal");
vPanel1.setVisible(scientificMode.isSelected());
mod.setVisible(scientificMode.isSelected());
xey.setVisible(scientificMode.isSelected());
ms.setVisible(scientificMode.isSelected());
mr.setVisible(scientificMode.isSelected());
mc.setVisible(scientificMode.isSelected());
if(scientificMode.isSelected())
setTitle("Scientific Model");
else
setTitle("Normal Model");
validate();
pack();
}
// post the result
else if(actionCommand.equals("="))
{
// if the pre-operated command was "=", return the pre-step
if(!preOperatedCommand.equals("="))
tail = Double.parseDouble(result.getText().trim());
// if the two numbel are 0, we don't need calculate the result
if(tail!= 0.0 || head !=0.0)
{
// division
if(operatedCommand.equals("/u00F7"))
{
if(Math.abs(tail) > 0.0000000000000000001)
{
head = head/tail;
result.setText(Double.toString(head));
}
else
{
JOptionPane.showMessageDialog(this, "Cannot divide by zero.");
head = 0.0;
tail = 0.0;
}
substitution = true;
}
// multiplacation
else if(operatedCommand.equals("/u00d7"))
{
head = head*tail;
result.setText(Double.toString(head));
substitution = true;
}
// sub
else if(operatedCommand.equals("-"))
{
head = head-tail;
result.setText(Double.toString(head));
substitution = true;
}
// plus
else if(operatedCommand.equals("+"))
{
head = head+tail;
result.setText(Double.toString(head));
substitution = true;
}
// pow
else if(operatedCommand.equals("pow"))
{
head = Math.pow(head, tail);
result.setText(Double.toString(head));
substitution = true;
}
// the Yth root of the X
else if(operatedCommand.equals("XeY"))
{
head = Math.pow(head, 1/tail);
result.setText(Double.toString(head));
substitution = true;
}
// modular
else if(operatedCommand.equals("Mod"))
{
head = head % tail;
result.setText(Double.toString(head));
substitution = true;
}
}
preOperatedCommand = "=";
}
/*************************************************************
* set the action of the number
**************************************************************/
else if(actionCommand.equals("0"))
{
if(!(result.getText().equals("0") || result.getText().equals("-0")))
{
if(substitution)
{
result.setText("0");
}
else
result.setText(result.getText() + "0");
}
}
else if(actionCommand.equals("1"))
{
if(substitution)
{
result.setText("1");
substitution = false;
}
else
result.setText(result.getText() + "1");
}
else if(actionCommand.equals("2"))
{
if(substitution)
{
result.setText("2");
substitution = false;
}
else
result.setText(result.getText() + "2");
}
else if(actionCommand.equals("3"))
{
if(substitution)
{
result.setText("3");
substitution = false;
}
else
result.setText(result.getText() + "3");
}
else if(actionCommand.equals("4"))
{
if(substitution)
{
result.setText("4");
substitution = false;
}
else
result.setText(result.getText() + "4");
}
else if(actionCommand.equals("5"))
{
if(substitution)
{
result.setText("5");
substitution = false;
}
else
result.setText(result.getText() + "5");
}
else if(actionCommand.equals("6"))
{
if(substitution)
{
result.setText("6");
substitution = false;
}
else
result.setText(result.getText() + "6");
}
else if(actionCommand.equals("7"))
{
if(substitution)
{
result.setText("7");
substitution = false;
}
else
result.setText(result.getText() + "7");
}
else if(actionCommand.equals("8"))
{
if(substitution)
{
result.setText("8");
substitution = false;
}
else
result.setText(result.getText() + "8");
}
else if(actionCommand.equals("9"))
{
if(substitution)
{
result.setText("9");
substitution = false;
}
else
result.setText(result.getText() + "9");
}
else if(actionCommand.equals("."))
{
if(result.getText().length() == 0)
result.setText("0.");
if(!(result.getText().contains(".")))
result.setText(result.getText() + ".");
}
else if(actionCommand.equals("/u00b1"))
{
if(result.getText().charAt(0) != '-')
result.setText("-" + result.getText());
else
result.setText(result.getText().substring(1));
}
else if(actionCommand.equals("C"))
{
result.setText("0");
substitution = true;
}
/*************************************************************
* set the action of the arithmetic
**************************************************************/
// division
else if(actionCommand.equals("/u00F7"))
{
head = Double.parseDouble(result.getText().trim());
operatedCommand = "/u00F7";
substitution = true;
preOperatedCommand = "/u00F7";
}
// multiplication
else if(actionCommand.equals("/u00d7"))
{
head = Double.parseDouble(result.getText().trim());
operatedCommand = "/u00d7";
substitution = true;
preOperatedCommand = "/u00d7";
}
// sub
else if(actionCommand.equals("-"))
{
head = Double.parseDouble(result.getText().trim());
operatedCommand = "-";
substitution = true;
preOperatedCommand = "-";
}
// plus
else if(actionCommand.equals("+"))
{
head = Double.parseDouble(result.getText().trim());
operatedCommand = "+";
substitution = true;
preOperatedCommand = "+";
}
// backwards
else if(actionCommand.equals("1/X"))
{
head = Double.parseDouble(result.getText().trim());
if(head != 0)
result.setText(Double.toString(1/head));
else
{
JOptionPane.showMessageDialog(this, "Cannot divide by zero.");
head = 0.0;
tail = 0.0;
}
}
// factorial
else if(actionCommand.equals("X!"))
{
head = Double.parseDouble(result.getText().trim());
result.setText(Double.toString(factorial(head)));
}
// square
else if(actionCommand.equals("sqr"))
{
head = Double.parseDouble(result.getText().trim());
result.setText(Double.toString(head*head));
}
// square root
else if(actionCommand.equals("/u221a"))
{
head = Double.parseDouble(result.getText().trim());
if(head >= 0.0)
result.setText(Double.toString(Math.sqrt(head)));
else
{
JOptionPane.showMessageDialog(this, "Invalid input for function");
head = 0.0;
tail = 0.0;
}
}
// power
else if(actionCommand.equals("pow"))
{
head = Double.parseDouble(result.getText().trim());
operatedCommand = "pow";
substitution = true;
preOperatedCommand = "pow";
}
// the Yth of the X
else if(actionCommand.equals("XeY"))
{
head = Double.parseDouble(result.getText().trim());
operatedCommand = "XeY";
substitution = true;
preOperatedCommand = "XeY";
}
// modular
else if(actionCommand.equals("Mod"))
{
head = Double.parseDouble(result.getText().trim());
operatedCommand = "Mod";
substitution = true;
preOperatedCommand = "Mod";
}
// MS
else if(actionCommand.equals("MS"))
{
variableMemory = Double.parseDouble(result.getText().trim());
}
// MR
else if(actionCommand.equals("MR"))
{
result.setText(Double.toString(variableMemory));
}
// MC
else if(actionCommand.equals("MC"))
{
variableMemory = 0.0;
}
}
/**
* calculates and returns the factorial of the value
*
* @param value value of the root of the factorial
*
*/
public double factorial(double value)
{
if(value <= 1.0)
return value;
else
return value*factorial(value-1);
}
/**
* calculates and returns the check sum of the message.
*
* @param message message of the name whick entered by the user.
*/
public long calChecksum(String message)
{
long check=0;
for (int i=0;i<message.length();i++)
check += message.charAt(i);
return check;
}
public static void main(String[] args)
{
Calculator calculator = new Calculator();
calculator.pack();
calculator.setVisible(true);
}
}
