Programming in C++ Interview : Practice MCQ Questions & Answers with Explanations

Private members of a class are inherited to the child class but are not accessible from the child class.

In Procedural programming like C we don’t have the concept of polymorphism, therefore, all the function calls are resolved at the compile-time but in case of OOP languages sue to polymorphism concept all function calls are not resolved at compile-time.

No explanation is available for this question yet.

Distributive is not a type of inheritance whereas others are a type of inheritance having their own meaning.

Both statements are false because all the operators of C++ cannot be overloaded and the basic meaning of an operator cannot be changed, we can only give new meaning to an operator.

All the options mentioned above uses static polymorphism mechanism. As the conflicts in all these types of functions are resolved during compile-time.

As we will be using the existing code therefore we don’t need to check the code again and again so testing and maintenance time decreases but the compiler time may increase or remains same because though we are reusing the code but every part needs to be compiled and extra include statement needs to be executed therefore compilation time may remain same or increases.

C++ allows both static and dynamic type checking i.e. types are checked by the compiler.

Virtual functions are used to implement the concept of late binding i.e. binding actual functions to their calls.

Virtual keyword cannot be used with constructors as constructors are defined to initialized an object of particular class hence no other class needs constructor of other class.

cout in C++ uses << operator to print anything so << operator is overloaded for a cout object.

As the variable is containing the information about the float value val = 5.5 therefore the container is not empty therefore the program outputs “Var is not Empty”.

has_value() function is provided to check whether a given any container is empty or not.

The type function is used to get information about the data stored in the any container variable. name() attribute is used to print the type id of the data. Now as the data stored in any variable is float therefore the program outputs f as f is the type id for float.

type() function is used to check the type of data/value the container object is holding.

In this program we are using emplace() function to change the any variable contents and this is allowed in C++ therefore the program runs fine.

emplace() function is used to change the object contained in any container i.e destroying the present object and creating the new object for the value given by the user.

bad_any_cast exception is thrown when typecasting is not done properly by the user i.e. if any is storing int value and we are trying to cast it into a string then the program will throw bad_any_cast exception.

fill() function sets the value of each element equal to the value passed as parameter to the function.

fill() function is used to fill an array class with the given single value.