using System;

​

public class Program

{

    public static void Main()

    {

        while(true){

            Console.WriteLine("+ = Addition\n- = Subtraction\n* = Multiplication\n** = The power of\n/ = Division\n// = Root");

            Console.WriteLine("==============");

            Console.WriteLine("Enter a number");

            double a = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("Enter an operator");

            string c = Convert.ToString(Console.ReadLine());

            Console.WriteLine("Enter a number");

            Int64 b = Convert.ToInt64(Console.ReadLine());

​

            if (c == "/"){

                Console.WriteLine("==============");

                double Answer  = a/b;

                Console.WriteLine(Answer);

            }

​

            else if (c == "*"){

                Console.WriteLine("==============");

                double Answer  = a*b;

                Console.WriteLine(Answer);

            }

​

            else if (c == "-"){

                Console.WriteLine("==============");

                double Answer  = a-b;

                Console.WriteLine(Answer);

            }

​

            else if (c == "+"){

                Console.WriteLine("==============");

                double Answer  = a+b;

                Console.WriteLine(Answer);

            }

            else if (c == "**"){

                Console.WriteLine("==============");

                double Answer  = Math.Pow(a, b);

                Console.WriteLine(Answer);

            }

            else if (c == "//"){

                Console.WriteLine("==============");

                double d = 1.0 / b;

                double Answer  = Math.Pow(a, d);

                Console.WriteLine(Answer);

            }

            else{

                Console.WriteLine("==============");

                Console.WriteLine("Please use a proper operator:\n+ = Addition\n- = Subtraction\n* = Multiplication\n** = The power of\n/ = Division\n// = Root");

            }

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

        }

    }

}