What is vptr in C++? - CPP Quiz

CPP - Quiz(MCQ)

What is vptr in C++?

A)

A hidden pointer in a class that points to virtual functions of that class

B)

A hidden pointer in a class that points to a virtual table of that class

C)

A pointer in a class that points to other class

D)

A hidden pointer in a class that points to virtual members of the class of that class

Correct Answer : A hidden pointer in a class that points to a virtual table of that class

Explanation : This vtable pointer or _vptr, is a hidden pointer added by the compiler to the base class and this pointer is pointing to the virtual table of that particular class. This _vptr is inherited to all the derived classes. Each object of a class with virtual functions transparently stores this _vptr.

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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