Question

Which of the following is a valid definition of the derived class bClass? a. class bClass::aClass { //... } b. class bClass: public aClass { //... }; c. class aClass::bClass { //... }; d. class aClass: public bClass { //... };

Answer 1

Answer:  

The answer to the given question is the option "b".  

Explanation:  

In the question option b is correct. It is given that class bClass is a derived class that inherits the base class that is aClass. In the c++ programming language we use the (:) for the perform in inheritance. "Driving a new class from an old class is called inheritance". and other options are not correct that can be described as follows:

• In option (a) and option(c) the scope resolution operator is used, The scope resolution operator does not use for the single level inheritance it is used for declaring the outline function as well as it is also used for initialized the static variable.That.s why the option(a) and option(c) is incorrect.  
• In the option(d) the base class i.e "aClass" inherit the derived class i.e "bClass " this is wrong so this option is incorrect

That's why the option "b" is correct.