Problem Statement Write a program that uses the java Math library and implement

Question

Problem Statement

Write a program that uses the java Math library and implement the functionality of a scientific calculator. Your program should have the following components:
1. A main menu listing all the functionality of the calculator.
2. Your program should use the switch structure to switch between various options of the calculator. Your Program should also have the provision to handle invalid option selection by the user.
3. Your calculator SHOULD HAVE the following functionalities. You can add any other additional features. PLEASE MAKE SURE YOU USE APPROPRIATE DATA TYPES.
a. Basic Functionality:
i. Add two numbers.
ii. Subtract two numbers.
iii. Divide a number by the second number (Don’t forget to check for the divide by zero error).
iv. Multiply two numbers.
v. Remainder when a number is divided by the second.
b. Scientific Calculations:
i. Ceiling and Floor of a number.
ii. Sine, Cosine and Tangent of an angle given in radians.
iii. x2, x3 and xy (You can display exponents in your program as x^y).
iv. Square root of a non-negative number (add appropriate checks in your program).
v. Logarithm of x base 10, natural logarithm of x base e and exponential function ex
vi. Absolute value of a given number x.
c. Additional Features: a can be done by using simple arithmetic operators. b can be done using the Math library of java. You have to write code to add the following features to your calculator:
i. Calculate average of arbitrary positive numbers input by the user (Use a loop and an appropriate sentinel value to achieve this task).
ii. Determine if a number is even or odd.
iii. Determine if one number is a multiple of the other.
iv. Factorial of a non-negative integer.

Explanation / Answer

//************************************** //HTML for :Simple/Scientific Calculator //************************************** /** Alogorithm for Calculator(Basic And Scientific) Author: Inder Mohan Singh Date Started: 12/12/2000 Date Finished: 16/12/2000 Sequence to create a GUI for Calculator 1. Create a Calculator Frame (size 200 by 270) 2. Add MenuBar to it. 3. Add MenuItem (CheckBox type Basic And Extended) 4. Add TextField (to show the result of the calculations) 5. Add CheckBox for radians and degree 6. Add Button to the Frame (20 for basic and another 8 for extended) 7. The following Action/Item methods to be included (a) actionPerformed(ActionEvent ae){ all the action performed on the calculator will be noted by this method like pressing add(+) button etc} (b) itemStateChanged(ItemEvent ie){ this will checks on the menubar itemse.g. If you click on the extended item of View menu you will see the extended view of the calculator} 8. The other methods/classes to be used (i) makeCalculator(){ this will build the GUI for the calculator} (ii) resetButtons (num) { this will reset the buttons i.e. change the property to false} (iii)reciprocal(num){ if num is zero than error message else num =1/num} (iv) changeSign(num){ change the sign of the num} (v) factorial(num){ if num is less than 1 error message else do the factorial} (vi) class MessageBox extends Dialog implements ActionListener { this class is called from other methods to display the error messages.Make a constructor} */ import java.awt.*; import java.awt.event.*; // class CalcFrame for creating a calculator frame and added windolistener to // close the calculator class CalcFrame extends Frame { CalcFrame( String str) { // call to superclass super(str); // to close the calculator(Frame) addWindowListener(new WindowAdapter() { public void windowClosing (WindowEvent we) { System.exit(0); } }); } } // main class Calculator implemnets two interfaces ActionListener // and ItemListener public class Calculator implements ActionListener, ItemListener { // creating instances of objects CalcFrame fr; MenuBar mb; Menu view, font, about; MenuItem bold, regular, author; CheckboxMenuItem basic, scientific; CheckboxGroup cbg; Checkbox radians, degrees; TextField display; Button key[] = new Button[20]; // creates a button object array of 20 Button clearAll, clearEntry, round; Button scientificKey[] = new Button[10]; // creates a button array of 8 // declaring variables boolean addButtonPressed, subtractButtonPressed, multiplyButtonPressed; boolean divideButtonPressed, decimalPointPressed, powerButtonPressed; boolean roundButtonPressed = false; double initialNumber;// the first number for the two number operation double currentNumber = 0; // the number shown in the screen while it is being pressed int decimalPlaces = 0; // main function public static void main (String args[]) { // constructor Calculator calc = new Calculator(); calc.makeCalculator(); } public void makeCalculator() { // size of the button final int BWIDTH = 25; final int BHEIGHT = 25; int count =1; // create frame for the calculator fr = new CalcFrame("Basic Calculator"); // set the size fr.setSize(200,270); fr.setBackground(Color.blue);; // create a menubar for the frame mb = new MenuBar(); // add menu the menubar view = new Menu("View"); font = new Menu ("Font"); about = new Menu("About"); // create instance of object for View menu basic = new CheckboxMenuItem("Basic",true); // add a listener to receive item events when the state of an item changes basic.addItemListener(this); scientific = new CheckboxMenuItem("Scientific"); // add a listener to receive item events when the state of an item changes scientific.addItemListener(this); // create instance of object for font menu bold = new MenuItem("Arial Bold"); bold.addActionListener(this); regular = new MenuItem("Arial Regular"); regular.addActionListener(this); // for about menu author = new MenuItem("Author"); author.addActionListener(this); // add the items in the menu view.add(basic); view.add(scientific); font.add(bold); font.add(regular); about.add(author); // add the menus in the menubar mb.add(view); mb.add(font); mb.add(about); // add menubar to the frame fr.setMenuBar(mb); // override the layout manager fr.setLayout(null); // set the initial numbers that is 1 to 9 for (int row = 0; row < 3; ++row) { for (int col = 0; col < 3; ++col) { // this will set the key from 1 to 9 key[count] = new Button(Integer.toString(count)); key[count].addActionListener(this); // set the boundry for the keys key[count].setBounds(30*(col + 1), 30*(row + 4),BWIDTH,BHEIGHT); key[count].setBackground(Color.yellow); // add to the frame fr.add(key[count++]); } } // Now create, addlistener and add to frame all other keys //0 key[0] = new Button("0"); key[0].addActionListener(this); key[0].setBounds(30,210,BWIDTH,BHEIGHT); key[0].setBackground(Color.yellow); fr.add(key[0]); //decimal key[10] = new Button("."); key[10].addActionListener(this); key[10].setBounds(60,210,BWIDTH,BHEIGHT); key[10].setBackground(Color.yellow); fr.add(key[10]); //equals to key[11] = new Button("="); key[11].addActionListener(this); key[11].setBounds(90,210,BWIDTH,BHEIGHT); key[11].setBackground(Color.yellow); fr.add(key[11]); //multiply key[12] = new Button("*"); key[12].addActionListener(this); key[12].setBounds(120,120,BWIDTH,BHEIGHT); key[12].setBackground(Color.yellow); fr.add(key[12]); //divide key[13] = new Button("/"); key[13].addActionListener(this); key[13].setBounds(120,150,BWIDTH,BHEIGHT); key[13].setBackground(Color.yellow); fr.add(key[13]); //addition key[14] = new Button("+"); key[14].addActionListener(this); key[14].setBounds(120,180,BWIDTH,BHEIGHT); key[14].setBackground(Color.yellow); fr.add(key[14]); //subtract key[15] = new Button("-"); key[15].addActionListener(this); key[15].setBounds(120,210,BWIDTH,BHEIGHT); key[15].setBackground(Color.yellow); fr.add(key[15]); //reciprocal key[16] = new Button("1/x"); key[16].addActionListener(this); key[16].setBounds(150,120,BWIDTH,BHEIGHT); key[16].setBackground(Color.yellow); fr.add(key[16]); //power key[17] = new Button("x^n"); key[17].addActionListener(this); key[17].setBounds(150,150,BWIDTH,BHEIGHT); key[17].setBackground(Color.yellow); fr.add(key[17]); //change sign key[18] = new Button("+/-"); key[18].addActionListener(this); key[18].setBounds(150,180,BWIDTH,BHEIGHT); key[18].setBackground(Color.yellow); fr.add(key[18]); //factorial key[19] = new Button("x!"); key[19].addActionListener(this); key[19].setBounds(150,210,BWIDTH,BHEIGHT); key[19].setBackground(Color.yellow); fr.add(key[19]); // CA clearAll = new Button("CA"); clearAll.addActionListener(this); clearAll.setBounds(30, 240, BWIDTH+20, BHEIGHT); clearAll.setBackground(Color.yellow); fr.add(clearAll); // CE clearEntry = new Button("CE"); clearEntry.addActionListener(this); clearEntry.setBounds(80, 240, BWIDTH+20, BHEIGHT); clearEntry.setBackground(Color.yellow); fr.add(clearEntry); // round round = new Button("Round"); round.addActionListener(this); round.setBounds(130, 240, BWIDTH+20, BHEIGHT); round.setBackground(Color.yellow); fr.add(round); // set display area display = new TextField("0"); display.setBounds(30,90,150,20); display.setBackground(Color.white); // key for scientific calculator // Sine scientificKey[0] = new Button("Sin"); scientificKey[0].addActionListener(this); scientificKey[0].setBounds(180, 120, BWIDTH + 10, BHEIGHT); scientificKey[0].setVisible(false); scientificKey[0].setBackground(Color.yellow); fr.add(scientificKey[0]); // cosine scientificKey[1] = new Button("Cos"); scientificKey[1].addActionListener(this); scientificKey[1].setBounds(180, 150, BWIDTH + 10, BHEIGHT); scientificKey[1].setBackground(Color.yellow); scientificKey[1].setVisible(false); fr.add(scientificKey[1]); // Tan scientificKey[2] = new Button("Tan"); scientificKey[2].addActionListener(this); scientificKey[2].setBounds(180, 180, BWIDTH + 10, BHEIGHT); scientificKey[2].setBackground(Color.yellow); scientificKey[2].setVisible(false); fr.add(scientificKey[2]); // PI scientificKey[3] = new Button("Pi"); scientificKey[3].addActionListener(this); scientificKey[3].setBounds(180, 210, BWIDTH + 10, BHEIGHT); scientificKey[3].setBackground(Color.yellow); scientificKey[3].setVisible(false); fr.add(scientificKey[3]); // aSine scientificKey[4] = new Button("aSin"); scientificKey[4].addActionListener(this); scientificKey[4].setBounds(220, 120, BWIDTH + 10, BHEIGHT); scientificKey[4].setBackground(Color.yellow); scientificKey[4].setVisible(false); fr.add(scientificKey[4]); // aCos scientificKey[5] = new Button("aCos"); scientificKey[5].addActionListener(this); scientificKey[5].setBounds(220, 150, BWIDTH + 10, BHEIGHT); scientificKey[5].setBackground(Color.yellow); scientificKey[5].setVisible(false); fr.add(scientificKey[5]); // aTan scientificKey[6] = new Button("aTan"); scientificKey[6].addActionListener(this); scientificKey[6].setBounds(220, 180, BWIDTH + 10, BHEIGHT); scientificKey[6].setBackground(Color.yellow); scientificKey[6].setVisible(false); fr.add(scientificKey[6]); // E scientificKey[7] = new Button("E"); scientificKey[7].addActionListener(this); scientificKey[7].setBounds(220, 210, BWIDTH + 10, BHEIGHT); scientificKey[7].setBackground(Color.yellow); scientificKey[7].setVisible(false); fr.add(scientificKey[7]); // to degrees scientificKey[8] = new Button("todeg"); scientificKey[8].addActionListener(this); scientificKey[8].setBounds(180, 240, BWIDTH + 10, BHEIGHT); scientificKey[8].setBackground(Color.yellow); scientificKey[8].setVisible(false); fr.add(scientificKey[8]); // to radians scientificKey[9] = new Button("torad"); scientificKey[9].addActionListener(this); scientificKey[9].setBounds(220, 240, BWIDTH + 10, BHEIGHT); scientificKey[9].setBackground(Color.yellow); scientificKey[9].setVisible(false); fr.add(scientificKey[9]); cbg = new CheckboxGroup(); degrees = new Checkbox("Degrees", cbg, true); radians = new Checkbox("Radians", cbg, false); degrees.addItemListener(this); radians.addItemListener(this); degrees.setBounds(185, 75, 3 * BWIDTH, BHEIGHT); radians.setBounds(185, 95, 3 * BWIDTH, BHEIGHT); degrees.setVisible(false); radians.setVisible(false); fr.add(degrees); fr.add(radians); fr.add(display); fr.setVisible(true); } // end of makeCalculator public void actionPerformed(ActionEvent ae) { String buttonText = ae.getActionCommand(); double displayNumber = Double.valueOf(display.getText()).doubleValue(); // if the button pressed text is 0 to 9 if((buttonText.charAt(0) >= '0') & (buttonText.charAt(0)

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