Question

C# programming

Create a class called A with private integer field x, protected integer field y, public integer field z. Create a class B derived from class A with public integer field d and protected integer field e and private field f.

1. Write a main (in a THIRD class called Program) that create an object B and assign all publicly accessible fields of the object with value of 1. Which fields will have a value of 1?
2. Create a method Foo in B and assign all fields accessible to the method with value of 2. Which fields will have a value of 2 now?
3. If I try to define public integer fields x, y and z in class B, what will happen? Which one will cause a compilation warning? Why do you think the result is like that?

Write your answer to all three questions below:

Answer 1

Here is the completed code for this problem. Answers for each question is provided as comments in the code. Go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

using System;

//class A with needed attributes
class A{
    private int x;
    protected int y;
    public int z;
    
}

//class B with needed attributes
class B: A{
    public int d;
    protected int e;
    private int f;
    
    //method to set all accessible variables to 2
    public void Foo(){
        //from B class, we can alter y and z attributes in super class and
        //all attributes in B class. x atribute cannot be altered because it is
        //private in class A
        y=2;
        z=2;
        d=2;
        e=2;
        f=2;
    }
    
    //if we declare x,y,z variables as public, it will show several warnings that
    //this will hide the super class variables x, y and z. i.e it is possible to
    //declare values like below, but it will hide super class variables. This warning
    //will be shown to the variables y and z only, since x is private. but there will
    //be another warning that x's value is never assigned or used as there is no way
    //to access or alter the value of x as there is no mutator or accessor method for x.
    public int x, y, z;
}

//class Program with Main()
public class Program
{
    
    public static void Main(string[] args){
        //creating an object of B
        B objB=new B();
        //from outside the B class, we can only access variables d and z since those two
        //are the only public variables. private and protected members cannot be accessed
        //outside the class, so we can set variable d in B class and variable z in A class to 1
        objB.d=1;
        objB.z=1;
        
        //calling Foo method on objB, now the variables y,z,d,e and f will have the value 2
        objB.Foo();

    }
}