Calculator.java

import java.util.Scanner;
public class Calculator{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        boolean running = true;
        while(running){
            System.out.println("Bienvenue dans votre calculatrice :");
            System.out.println("Addition : 1");
            System.out.println("Soustraction : 2");
            System.out.println("Multiply : 3");
            System.out.println("Divide : 4");
            System.out.println("Exit : 5");
            System.out.println(" Choose an operation : ");
             int choice = scan.nextInt();
            if(choice == 5){
            running = false;
            System.out.println("Goodbye!");
            break;
            }
            System.out.println("Enter the first number a : ");
        double a = scan.nextDouble();
        System.out.println("Enter the second number b : ");
        double b = scan.nextDouble();
        double result = 0;
        switch(choice){
            case 1 :  result = Operations.add(a,b); break;
            case 2 :  result = Operations.subtract(a,b); break;
            case 3 :  result = Operations.multiply(a,b); break;
            case 4 :  result = Operations.divide(a,b); break;
            default : System.out.println("Invalide choice !"); break;
        }
        System.out.println("Result : "+ result);
    }
    scan.close();
    }

}