using System;

public class parent

{

    public parent()

    {

        Console.WriteLine("Parent class Constructor");

    }

    public void msg()

    {

        Console.WriteLine("Parent class Method");

    }

    protected void add()

    {

        Console.WriteLine("Addition of 2 and 3: "+ (2+3));

    }

    private void sub()

    {

        Console.WriteLine("Substraction of 5 to 3: "+ (5-3));

    }

    internal void mul()

    {

        Console.WriteLine("Multiplication of 5 and 3: "+ (5*3));

    }

    protected internal void devide()

    {

        Console.WriteLine("Division of 5 by 3: "+ (5/3));

    }

}

​

public class child: parent

{

    public new void msg(){

        Console.WriteLine("child class method");

        base.msg();

    }

    static child(){

        Console.WriteLine("child constructor");

    }

    public int[] AvgReturningArray(int a, int b){

        int []result=new int[3];

        result[0]=a;

        result[1]=b;

        int sum=Sum(a,b);

        result[2]= sum/2;

        return result;

    }

    public Tuple<int, int, int> AvgReturningTuple(int a, int b){

        int x=a;

        int y=b;

        int avg=Sum(x,y)/2;

        return new Tuple<int, int, int>(x,y,avg);

    }

    public int Sum(int a, int b)

    {

        return a+b;

    }

    public static void Main()

    {

        child a = new child();

        a.msg();            //public

        a.add();            //protected

        int []avgArr=new int[3];

            avgArr=a.AvgReturningArray(5,7);

        Console.WriteLine("Using Array: " + "a="+ avgArr[0]+"   b="+avgArr[1]+"   Avg is: "+avgArr[2]);

        var Tuple=a.AvgReturningTuple(5,5);

        Console.WriteLine("Using Array: " + "a="+ Tuple.Item1+"   b="+Tuple.Item2+"   Avg is: "+Tuple.Item3);

    }

}

​

public class main

{

    public static void Main()

    {

        child a = new child();

        Console.WriteLine("Hello World");

        a.msg();            //public

        a.devide();         //protected internal

        a.mul();            //internal

    }

}