using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        char ac;

        double ft,ct;

        Console.WriteLine("enter of C to convert to Celsius /n");

Console.WriteLine("or enter of F to convert to fah");

Console.Write("character");

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

        Console.Write("Enter Theh Tepmrature : ");

        if(ac=="C"||ac=="c")

        {ac=(5/9)*(ft-32);

         Console.WriteLine("celisius ="+ac);

        }if(ac=="f"||ac=="F")

        {ac=((9/5)*ct)+32

            Console.WriteLine("fah = "+ac);

        }

​

    }

}