C# Programming - Classes and Objects - Discussion

According to me, 1, 5 is the correct options.

Statement 3 is incorrect, obvious example is system string class:

string s1 = new string ('a', 1) ;

string s2 = new string ('a', 1000) ;

s1 occupies 2 bytes, while s2 occupies 2000 bytes.

public class example
{
public static string use = "demonstrate class field";
public int nb;
}

public class program
{
public static void main(string[] args)
{
example e = new example();
e.nb = 3;
Console.WriteLine(example.use);
Console.WriteLine(e.nb);
}
}
}

e is an instance of the class example.

use is a class field, you recognize it with the keyword static. From the program you access it by prefixing it with the name of the class :

example.use

nb is an instance field, you access it by prefixing it with the name of the instance :

e.nb

If you declare three example objects you have three different values of nb, but only one value of use for it is a static field of the class.

What is difference b/w class variables and instance variable?

What is instance member?

Instance member can be directly accessed by class name if its static. So the first option is not correct.

You can also use 'protected internal' where you restrict access to the current assembly or types derived from the containing class.

Instance member can be directly accessed by class name if its static. So the first option is improper.

There is no friend function in c# but you can use the 'internal' access modifier which will make this class accessible to the other classes in the same assembly, but not accessible outside the assembly.

Alternatively you can also use 'protected internal' where you restrict access to the current assembly or types derived from the containing class.

I think we can access Instance member of a class using inheritance;.

So option 1 is wrong.

You need to check it out.