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Commit f8749a8

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‎Java_Beginner_Projects/Cal.java‎

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import javax.swing.JOptionPane;
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//A dialog calculator program.
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public class Cal {
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int input; // Class variable
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double x, y, z; // Class variable
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public void Menu(){//Class Menu method
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JOptionPane.showMessageDialog(null, "A Simple Calculator using Dialog." );
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input = Integer.parseInt(JOptionPane.showInputDialog("\t Menu: \n 1. Addition \n 2. Subtraction \n 3. Multiplication \n 4. Division \n 5. Exit \n Enter an option: "));
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}
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public void Add(){//Class Addition Method.
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JOptionPane.showMessageDialog(null, "\t Addition");
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x = Integer.parseInt(JOptionPane.showInputDialog("Enter First Number: "));
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y = Integer.parseInt(JOptionPane.showInputDialog("Enter Second Number: "));
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z = x+y;
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JOptionPane.showMessageDialog(null, x + " + " + y + " = " + (z));
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}
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public void Sub(){//Class Subtraction method
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JOptionPane.showMessageDialog(null, "\t Subtraction");
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x = Integer.parseInt(JOptionPane.showInputDialog("Enter First Number: "));
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y = Integer.parseInt(JOptionPane.showInputDialog("Enter Second Number: "));
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z = x-y;
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JOptionPane.showMessageDialog(null, x + " - " + y + " = " + (z));
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}
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public void Mul(){//Class Multiplication method
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JOptionPane.showMessageDialog(null, "\t Addition");
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x = Integer.parseInt(JOptionPane.showInputDialog("Enter First Number: "));
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y = Integer.parseInt(JOptionPane.showInputDialog("Enter Second Number: "));
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z = x*y;
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JOptionPane.showMessageDialog(null, x + " x " + y + " = " + (z));
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}
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public void Div(){//Class Division method.
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JOptionPane.showMessageDialog(null, "\t Addition");
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x = Integer.parseInt(JOptionPane.showInputDialog("Enter First Number: "));
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y = Integer.parseInt(JOptionPane.showInputDialog("Enter Second Number: "));
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z = x/y;
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//Validating the division method, incase user input for y = 0;
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if(y ==0){
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JOptionPane.showMessageDialog(null, "Division by zero is invalid!");
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}
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else{
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JOptionPane.showMessageDialog(null, x + " / " + y + " = " + (z));
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}
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}
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public void exit() {//A class method to quit the program.
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JOptionPane.showMessageDialog(null, "You closed the program, goodbye!");
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}
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public static void main(String[] args) {
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int next;
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do{//A do-while loop for program reusability.
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Cal h = new Cal();//An object for the class.
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h.Menu();//Calling te menu Menu.
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//A list of conditions to validate user inputs for menu options.
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if (h.input==1){
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h.Add();
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}
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else if (h.input==2){
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h.Sub();
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}
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else if (h.input==3){
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h.Mul();
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}
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else if (h.input==4){
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h.Div();
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}
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else if (h.input==5) {
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h.exit();
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}
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else{//An else statement for error handling.
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JOptionPane.showMessageDialog(null, "Your input was invalid. Please try again.");
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}
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//Global variable for program continuation.
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next = Integer.parseInt(JOptionPane.showInputDialog(null, "Do you want to continue: (1.Yes / 2.No)"));
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if(next == 2){h.exit();}//for quitting when a user choise is 2(No).
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}while(next == 1);//Continue while user input is yes for next.
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}
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}
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import java.util.Scanner;// A library that permits user input in java.
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public class Calculator {// A simple calculator program.
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Scanner scanner = new Scanner(System.in);//A variable that holds user inputs.
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public void Menu(int Option){// A Menu method.
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System.out.println("\t A Simple Calculator program \n\t--Menu-- \n 1. Addition \n 2. Subtraction \n 3. Multiplication \n 4. Division \n 5. Exit");
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System.out.print("Enter an option: ");
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}
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//The Addition method
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public int Add(){
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System.out.println("\n \tAddition...");
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System.out.println("Enter your first number: ");
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int a = scanner.nextInt();
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System.out.println("Enter your second number: ");
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int b = scanner.nextInt();
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System.out.println("Answer = " + (a + b));
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return a + b;
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}
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//The subtraction method.
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public int Sub(){
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System.out.println("\n \tSubtraction...");
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System.out.println("Enter your first number: ");
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int a = scanner.nextInt();
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System.out.println("Enter your second number: ");
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int b = scanner.nextInt();
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System.out.println("Answer = " + (a - b));
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return a - b;
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}
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// The multiplication method.
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public int Mul(){
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System.out.println("\n \tMultiplication...");
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System.out.println("Enter your first number: ");
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int a = scanner.nextInt();
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System.out.println("Enter your second number: ");
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int b = scanner.nextInt();
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System.out.println("Answer = " + (a * b));
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return a * b;
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}
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//The division method.
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public void Div(){
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System.out.println("\n \tDivision...");
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System.out.println("Enter your first number: ");
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int a = scanner.nextInt();
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System.out.println("Enter your second number: ");
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int b = scanner.nextInt();
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if (b==0){
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String zero ="Division by zero is invalid";
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System.err.println(zero);
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}
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else{
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System.out.println("Answer = " + (a / b));
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}
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}
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//A method for exit.
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public void exit(){
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System.out.println("Exiting...");
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}
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int option;
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//Main Method.
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public void main(String [] args){
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option = scanner.nextInt();
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int c;
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do{
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Menu(option);//calling the menu method using the args option.
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switch (option) {
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case 1:
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Add();
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break;
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case 2:
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Sub();
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break;
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case 3:
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Mul();
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break;
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case 4:
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Div();
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break;
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case 5:
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exit();
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break;
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default:
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System.out.println("Unknown option");
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break;
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}
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System.out.println("Do you want to continue? \n (1. Yes 2. No)");
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c = scanner.nextInt();
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if (c== 2){exit();}
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else{
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System.out.println("\n\n\n");
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}
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}while(c == 1);
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}
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}

‎Java_Beginner_Projects/fizzbuzz.java‎

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public class fizzbuzz {
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public void main(String[] args){
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Display();
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}
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public void Display(){
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System.err.println("Welcome to the FizzBuzz: \t");
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for (int i = 1; i <= 100; i++) {
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if (i % 5 == 0 && i % 3 == 0) {
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System.err.println("FizzBuzz");
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}
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else if (i % 5 == 0){
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System.err.println("Fizz");
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}
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else if(i % 3 == 0){
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System.err.println("Buzz");
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}
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else{
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System.err.println(i);
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}
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}
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}
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}

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