C# Program with "abstract keyword".

C# Program with "abstract keyword".

abstract class aaa

{

abstract public void sam();

}

/* class bbb:aaa                   // wrong

{

}  */

abstract class ccc:aaa         //Correct

{

}

class ddd:aaa

{

public override void sam()

{

System.Console.WriteLine("Hello");

}

}

class psp

{

public static void Main()

{

//aaa a;                              //Correct

//a=new aaa();               // Wrong , Because can't create instance or object of an abstract class . 

ddd d =new ddd();

d.sam();

}

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