INTERVIEW QUESTIONS C++ C++ BASICS DETAILS

Question: Why can't one make an object of abstract class?Give compiler view of statement

Answer: we cant make object of abstract class becoz, in the vtable the vtable entry for the abstract class functions will be NULL, which ever are defined as pure virtual functions...

even if there is a single pure virtual function in the class the class becomes as abstract class..

if there is a virtual function in your class the compiler automatically creates a table called virtual function table .. to store the virtual function addresses.... if the function is a pure virtual function the vtable entry for that function will be NULL.

even if there is a single NULL entry in the function table the compiler does not allow to create the object.

we cant make object of abstract class becoz, in the vtable the vtable entry for the abstract class functions will be NULL, which ever are defined as pure virtual functions...

even if there is a single pure virtual function in the class the class becomes as abstract class..

if there is a virtual function in your class the compiler automatically creates a table called virtual function table .. to store the virtual function addresses.... if the function is a pure virtual function the vtable entry for that function will be NULL.

even if there is a single NULL entry in the function table the compiler does not allow to create the object.
Source: CoolInterview.com

We cant make object of an abstract class, as they are not defined actually. so until we define it we cant instantiate an object-will throw error Source: CoolInterview.com

If you have the better answer, then send it to us. We will display your answer after the approval.

Rules to Post Answers in CoolInterview.com:-

• There should not be any Spelling Mistakes.
• There should not be any Gramatical Errors.
• Answers must not contain any bad words.
• Answers should not be the repeat of same answer, already approved.
• Answer should be complete in itself.

Name :*
Email Id :*
Answer :*
Verification Code	Not readable? Load New Code
Enter the above shown code: *
	Inform me about updated answers to this question