using System;

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​

public class Program

{

public static void Main()

{

Console.WriteLine("Hello this is my more advanced calculator !! ");

Console.ReadLine();

menu();

}

static void menu()

{

int options;

Console.Clear();

Console. WriteLine(" Menu  ");

Console.WriteLine("_____________"); 

Console.WriteLine("1. Add");

Console.WriteLine("2. Subtract");

Console.WriteLine("3. Multiply");

Console.WriteLine("4. Divide");

Console.WriteLine("5. Square Root");

Console.WriteLine("6. Exit");

Console.WriteLine("");

Console.WriteLine("");

Console.WriteLine("");

Console.WriteLine(" Please select a number from the menu !!");

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

if ((options < 1)||(options > 6))

{menu();

}

if (options == 1)

{

 add();

}

if (options == 2)

{

Subtract();

}

    if (options == 3)

    {

Multiply();

    }

if (options == 4)

{

Divide();

}

if (options == 5)

{

SquareRoot();

}

if (options ==6)

{

Exit();

    }

    static void add()

    {

int number1;

int number2;

int answer;

Console.Clear();

Console. WriteLine ("I am in the Addition method.");

Console. WriteLine();

Console. WriteLine (" Please input the first number");

number1 = int.Parse(Console.ReadLine());

Console. WriteLine();

Console.WriteLine(" Please input the second number");

number2 = int.Parse(Console.ReadLine());

answer = number1 + number2;

Console.WriteLine();

Console.WriteLine(number1 + "*" + number2 + "=" + answer);

Console.ReadLine();

menu();

}

static void Subtract()

{

int number1;

int number2;

int answer;

    Console.Clear();

Console. WriteLine("| am in the Subtraction method.");

Console.WriteLine();

Console.WriteLine(" Please input the first number");

number1 = int.Parse(Console.ReadLine());

Console. WriteLine();

Console. WriteLine(" Please input the second number");

number2 = int.Parse(Console.ReadLine());

answer = number1 - number2;

Console.WriteLine();

Console.WriteLine(number1 + "-" + number2 + "=" + answer);

Console.ReadLine();

menu();

}

static void Multiply()

{

int number1; 

int number2;

int answer;

Console.Clear();

Console. WriteLine("| am in the Multiplication method.");

Console.WriteLine();

Console. WriteLine(" Please input the first number");

number1 = int.Parse(Console.ReadLine());

Console. WriteLine();

Console. WriteLine(" Please input the second number");

number2 = int.Parse(Console.ReadLine());

answer = number1 * number2;

Console.WriteLine();

Console.WriteLine(number1 + "*" + number2 + "=" + answer);

Console.ReadLine();

menu();

}

    static void Divide()

    {

int number1;

int number2;

int answer;

Console.Clear();

Console. WriteLine ("| am in the Division method.");

Console. WriteLine();

Console. WriteLine (" Please input the first number");

number1 = int.Parse(Console.ReadLine());

Console. WriteLine();

Console. WriteLine (" Please input the second number");

number2 = int.Parse(Console.ReadLine());

answer = number1 / number2;

Console.WriteLine();

Console. WriteLine(number1 + "" + number2 + "=" + answer);

Console.ReadLine();

menu();

}

static void SquareRoot()

{

double number;

double answer;

Console.Clear();

Console. WriteLine("| am in the Square Root method.");

Console. WriteLine();

Console. WriteLine ("Please input a number and I will find it's Square Root.");

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

answer= Math.Sqrt(number);

Console.WriteLine(" The Square Root of " + number + "is " + answer);

Console.ReadLine();

menu();

}

static void Exit()

{

Console.Clear();

Console.WriteLine(" Thank you for using the more advanced calculator !! ");

Console.ReadLine();

Environment.Exit(0);

}

}

}

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