Question

The Calculator Class Create an application dlass called Colcustor with the following members Methods Retuns firtNumber secondumber static void mainsering Asks for two integer undan uiet", ..",ЛТеп shows the result according to Note Use the attached example program and add required methods. Then une a switch tructure in the try black to call proper method according to the input operator Sample Output 1 : 2074 Sample Output 2

Answer 1

import java.util.InputMismatchException;
import java.util.Scanner;

public class Calculator {

    private static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {

        int fNum = 0;
        int sNum = 0;
        int result = 0;
        char operator = '#';

        try {
            System.out.print("Please enter first integer number: ");
            fNum = scanner.nextInt();
            System.out.print("Please enter second integer number: ");
            sNum = scanner.nextInt();
            scanner.nextLine();
            System.out.print("Please enter an operation (*, -, +, / ): ");
            operator = scanner.nextLine().charAt(0);

            switch (operator) {

                case '+':
                    result = addition(fNum, sNum);
                    break;
                case '-':
                    result = subtraction(fNum, sNum);
                    break;
                case '/':
                    try {
                        result = quotient(fNum, sNum);
                    } catch (ArithmeticException ae) {
                        System.out.println("Divide by zero is an invalid operation");
                        System.exit(1);
                    }
                    break;
                case '*':
                    result = multiplication(fNum, sNum);
                    break;
                default:
                    System.out.println("Invalid operator");
                    break;
            }


        } catch (InputMismatchException ime) {
            System.out.println("Invalid integer entered");
            System.exit(1);
        }

        if (operator == '+' || operator == '-' || operator == '*' || operator == '/') {
            System.out.println("Result: " + fNum + " " + operator + " "+sNum + " = " + result);
        }
    }

    static int addition(int firstNumber, int secondNumber) {
        return firstNumber + secondNumber;
    }

    static int subtraction(int firstNumber, int secondNumber) {
        return firstNumber - secondNumber;
    }

    static int quotient(int firstNumber, int secondNumber) {
        return firstNumber / secondNumber;
    }

    static int multiplication(int firstNumber, int secondNumber) {
        return firstNumber * secondNumber;
    }


}