Which of the following is used to make an abstract class?(a) By using virtual keyword in front of a class declaration(b) By using an abstract keyword in front of a class declaration(c) By declaring a virtual function in a class(d) By declaring a pure virtual function in a classI have been asked this question in exam.The above asked question is from OOPs Concept in section Basics Concepts of C++ of C++

Which of the following is used to make an abstract class?(a) By using

1.	Which of the following is used to make an abstract class?(a) By using virtual keyword in front of a class declaration(b) By using an abstract keyword in front of a class declaration(c) By declaring a virtual function in a class(d) By declaring a pure virtual function in a classI have been asked this question in exam.The above asked question is from OOPs Concept in section Basics Concepts of C++ of C++
Answer» Right answer is (d) By DECLARING a pure virtual FUNCTION in a class Best EXPLANATION: Abstract class should have at least one pure virtual function. Therefore to declare an abstract class one should declare a pure virtual function in a class.

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