What is virtual inheritance in C++? - CPP Quiz

CPP - Quiz(MCQ)

What is virtual inheritance in C++?

A)

C++ technique to enhance multiple inheritance

B)

C++ technique to avoid multiple inheritances of classes

C)

C++ technique to avoid multiple copies of the base class into children/derived class

D)

C++ technique to ensure that a private member of the base class can be accessed somehow

Correct Answer : C++ technique to avoid multiple copies of the base class into children/derived class

Explanation :

Virtual inheritance is a C++ technique that ensures only one copy of a base class's member variables are inherited by grandchild derived classes. Without virtual inheritance, if two classes B and C inherit from a class A, and a class D inherits from both B and C, then D will contain two copies of A's member variables: one via B, and one via C. These will be accessible independently, using scope resolution.

Instead, if classes B and C inherit virtually from class A, then objects of class D will contain only one set of the member variables from class A. etc,. (Refer Wikipedia for more info..)

Recently Updated in CPP Questions

What is the signature of math in function using command line arguments?

A)

int main(int argc, char **argv);

B)

int main(int argc, char const **argv);

C)

int main(int argc, char const *argv[]);

D)

All of the above

Correct Answer : All of the above

Explanation : Any of the above signature can be used while using command line arguments in C++ programs

Which of the following gives the name of the program if the second parameter to the main fucntion is char **argv?

A)

argv[0]

B)

argv[1]

C)

argv[2]

D)

argv[3]

Correct Answer : argv[0]

Explanation : The first string in the list of command line arguments represents the name of the program which can be accessed by using argv[0].

What does the first parameter of the main function represent?

A)

List of command line arguments

B)

Stack of command line arguments

C)

Number of command line arguments

D)

Dictionary of command line arguments

Correct Answer : Number of command line arguments

Explanation : The first argument of the main() function represents the number of command line arguments that are passed.

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