using System;

public class Program

    //the scope of this global variable is the entire class because we declare it inside the class and not anything else

    //the scope is the extent of which a varibale can be seen

    //global variable can be seen in the entire class

    //constructer is a special type of subroutine called to create an object.

    // class is the instructions (variable) that apply to all the 

    //The static variable can be used to refer to the common property of all objects (which is not unique for each object)

    //for example, the company name of employees, college name of students, etc. 

    //The static variable gets memory only once in the class area at the time of class loading.

    //non static varibale can only be applied to an instance 

    //static variables applies to the class itself - you can't then refer to a non static variable

    //main is the static set of instructions

    //the global method can be modified by other people, which will affect your variables

    //Global variables can be read or modified by any part of the program, making it difficult to remember or reason about every possible use. 

    //Global Variable- No Access Control or Constraint Checking 

    //A global variable can be get or set by any part of the program, and any rules regarding its use can be easily broken or forgotten.

    //any program which is within another program is a Sub-Routine

    //Method, Function and Procedure are Sub-Routines

    //only strings have have a length and a value

{

    Program anInstanceofProgram = new Program();

    Program an2InstanceofProgram = new Program();

    //example

    public static void Main()

    {

        myInterfaceOne("hello","world"); //calling the method with 2 inputs

​

        myInterfaceOne("goodnight","sweetheart"); //calling the method with 2 inputs

    }

    public string myGlobalVariable = "Don't use me";

    public static void myInterfaceOne(string myStringOne, String myStringTwo)

    {

        Console.WriteLine(myStringOne + " " + myStringTwo); 

        Console.WriteLine(sayArrrgh()); // going to replace itself with the return value

    }

    public static string sayArrrgh()// void is when we state we are not returning a value

    {

        return "arrrgh"; // going to return a string

    }

}