using System;

​

namespace strin

{

    interface I

    {

         void multiply();

    }

    class A : I

    {

       public void multiply()

        {

            Console.WriteLine("Enter a float number");

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

            Console.WriteLine("Enter a float number");

            var b = Convert.ToDouble(Console.ReadLine());

            var c = a * b;

            Console.WriteLine(c);

​

        }

​

    }

   public class program { 

​

   public static void Main(string[] args)

    {

            A obj = new A();

            obj.multiply();

        }

    }

 } 

​