using System;

​

public class MainModule

{

    public static void Main()

    {

        string assignment = "Assignment#3B-Math Operations Modified";

        MathOperationUI myNumber = new MathOperationUI();

        myNumber.MathMainModule();

    }

}

​

public class MathOperations

{

    int firstOperand;

    int secondOperand;

    public int FirstOperand

    {

        get

        {

            return firstOperand;

        }

​

        set

        {

            firstOperand = value;

        }

    }

​

    public int SecondOperand

    {

        get

        {

            return secondOperand;

        }

​

        set

        {

            secondOperand = value;

        }

    }

​

    public MathOperations()

    {

        firstOperand = 0;

        secondOperand = 0;

    }

​

    public double Add()

    {

        double theAddition;

        theAddition = (firstOperand + secondOperand);

        return theAddition;

    }

​

    public double Subtract()

    {

        double theSubtraction;

        theSubtraction = (firstOperand - secondOperand);

        return theSubtraction;

    }

​

    public double Multiply()

    {

        double theMultiplication;

        theMultiplication = (firstOperand * secondOperand);

        return theMultiplication;

    }

​

    public double Divide()

    {

        double theDivision;

        theDivision = (float)firstOperand / (float)secondOperand;

        return theDivision;

    }

}

​

public class MathOperationUI

{

    MathOperations usersMathOperations;

    public MathOperationUI()

    {

        usersMathOperations = new MathOperations();

    }

​

    public void MathMainModule()

    {

        DisplayMenu();

        usersMathOperations.FirstOperand = PromptForInterger("first");

        usersMathOperations.SecondOperand = PromptForInterger("second");

        Console.WriteLine("\n\nEnter your coice");

        ProcessMenu(int.Parse(Console.ReadLine()));

    }

​

    public void DisplayMenu()

    {

        Console.WriteLine("\n\tMenu");

        Console.WriteLine("****************************");

        Console.WriteLine("1: Addition Operation");

        Console.WriteLine("2: Subtraction Operation");

        Console.WriteLine("3: Multiplication Operation");

        Console.WriteLine("4: Division Operation");

        Console.WriteLine("5: Exit");

        Console.WriteLine("****************************");

    }

​

    public void ProcessMenu(int choice)

    {

        if (choice == 1)

            Console.WriteLine("\nWhen adding the number {0} and {1}, the answer is {2}", usersMathOperations.FirstOperand, usersMathOperations.SecondOperand, usersMathOperations.Add());

        else if (choice == 2)

            Console.WriteLine("\nWhen subtracting the number {0} and {1}, the answer is {2}", usersMathOperations.FirstOperand, usersMathOperations.SecondOperand, usersMathOperations.Subtract());

        else if (choice == 3)

            Console.WriteLine("\nWhen multipling the number {0} and {1}, the answer is {2}", usersMathOperations.FirstOperand, usersMathOperations.SecondOperand, usersMathOperations.Multiply());

        else if (choice == 4)

            Console.WriteLine("\nWhen dividing the number {0} and {1}, the answer is {2:F2}", usersMathOperations.FirstOperand, usersMathOperations.SecondOperand, usersMathOperations.Divide());

        else if (choice == 5)

            Console.WriteLine("Bye Bye");

        else

            Console.WriteLine("Wrong Input");

    }

​

    static int PromptForInterger(string position)

    {

        Console.WriteLine("\n\nEnter the {0} number:\t", position);

        return (int.Parse(Console.ReadLine()));

    }

}