using System;

​

namespace calculator

{

    public class cal

    {

        public int Add(int a, int b)

        {

            return a + b;

        }

        public int sub(int a, int b)

        {

            return a - b;

        }

        public int mul(int a, int b)

        {

            return a * b;

        }

        public double div(int a, int b, out double remainder)

        {

            remainder = a % b;

            return a / b;

        }

    }

    public class Program

    {

        public static void Main(string[] args)

        {

            double rem;

            Console.WriteLine("Enter first number:");

            int n1 = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("Enter second number:");

            int n2 = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("Enter the operator");

            string op = Console.ReadLine();

            cal c1 = new cal();

​

            if (op == "+")

            {

                Console.WriteLine("result of {0}{1}{2} is {3} ",n1,op,n2,c1.Add(n1,n2));

            }

            else if (op == "-")

            {

                Console.WriteLine("result of {0}{1}{2} is {3} ", n1, op, n2, c1.sub(n1, n2));

            }

            else if (op == "*")

            {

                Console.WriteLine("result of {0}{1}{2} is {3} ", n1, op, n2, c1.mul(n1, n2));

            }

            else

            {

                Console.WriteLine("result of {0}{1}{2} is {3} ", n1, op, n2, c1.div(n1, n2,out rem));

                Console.WriteLine("remainder:"+rem);

            }

​

​

        }

    }

}