using System;

public class Program

    {

        double a= 22.52;

        const int b =20;

        string c ="Worawat";

        char d = 'Y';

        bool e=true;

    public void Main()

    {

    int f=20;

    a =a+10;

    Console.WriteLine("volue is {0}" , f);

    Console.WriteLine(a);

    }

    public void calculate()

    { a=30.5;

    }

}

​