using System;

public class Program

{

    public static void Main()

    {

    // Show options to the user

        Console.WriteLine("Choose a function to perform:");

        Console.WriteLine("1. Addition");

        Console.WriteLine("2. Subtraction");

        Console.WriteLine("3. Multiplication");

        Console.WriteLine("4. Division");

        Console.WriteLine("5. Modulus");

        Console.WriteLine("6. Quotient");

        Console.WriteLine("7. Exponentiation");

​

        // Get user's choice

        int choice = int.Parse(Console.ReadLine());

​

        // Get the numbers from the user

        Console.Write("Enter the first number: ");

        double num1 = double.Parse(Console.ReadLine());

​

        Console.Write("Enter the second number: ");

        double num2 = double.Parse(Console.ReadLine());

​

        // Perform the chosen operation

        double result = 0;

        string operation = "";

​

        if (choice == 1)

        {

            operation = "Addition";

            result = num1 + num2;

        }

        else if (choice == 2)

        {

            operation = "Subtraction";

            result = num1 - num2;

        }

        else if (choice == 3)

        {

            operation = "Multiplication";

            result = num1 * num2;

        }

        else if (choice == 4)

        {

            operation = "Division";

            if (num2 != 0)

            {

                result = num1 / num2;

            }

            else

            {

                Console.WriteLine("Error: Division by zero is not allowed.");

                return;

            }

        }

        else if (choice == 5)

        {

            operation = "Modulus";

            result = num1 % num2;

        }

        else if (choice == 6)

        {

            operation = "Quotient";

            result = (int)(num1 / num2);

        }

        else if (choice == 7)

        {

            operation = "Exponentiation";

            result = Math.Pow(num1, num2);

        }

        else

        {

            Console.WriteLine("Invalid choice.");

            return;

        }

​

        // Output the result

        Console.WriteLine("\nYou chose: " + operation);

        Console.WriteLine("Numbers used: " + num1 + " and " + num2);

        Console.WriteLine("The result is: " + result);

    }

}