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Chapter 15: Problem 5

Can a derived class ever directly access the private members of its base class?

Short Answer

Expert verified
Answer: No, a derived class cannot directly access the private members of its base class. The base class must provide public or protected methods, such as getter or setter methods, for the derived class to access or modify the private data.

Step by step solution

01

Understanding private members in a class

A private member in a class is a property, method, or variable that can be accessed only by the members of the class itself. It means that these members are not accessible from outside the class or any derived class. Private members are data-hiding mechanisms that ensure data is protected and encapsulated within the class, preventing unintentional changes by other parts of the program.
02

Inheritance in OOP

Inheritance is one of the four major principles in the OOP world. It allows a "child" or "derived" class to inherit, extend, and/or override properties or methods from the "parent" or "base" class. The derived class can use and modify all the public and protected members of the base class. However, it is important to note that inheritance does not grant access to the private members of the base class.
03

Accessing private members in derived classes

A derived class cannot directly access the private members of its base class. Private members are not available for inheritance, and their access is limited to the class they are defined in. If a derived class needs to access these private members, the base class should provide public or protected methods (known as getter or setter methods) to gain access to the private data.
04

Conclusion

In summary, a derived class cannot directly access the private members of its base class. However, the derived class can access the public and protected members inherited from the base class. If a derived class needs to access a private member, the base class must provide public or protected methods to access or modify the private data.

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Most popular questions from this chapter

A program uses two classes: Dog and poodle. Which class is the base class and which is the derived class?

A(n) ________ class cannot be instantiated.

Protected members of a base class are like ________ members, except they may be accessed by derived classes.

What is the class access specification of the base class named below? class Pet : public Dog

Write the declaration for class \(B\). The class's members should be \(\bullet\) \(\mathrm{m},\) an integer. This variable should not be accessible to code outside the class or to member functions in any class derived from class B. \(\bullet\) \(\mathrm{n},\) an integer. This variable should not be accessible to code outside the class, but should be accessible to member functions in any class derived from class B. \(\bullet\) setM, getM, setN, and getN. These are the set and get functions for the member variables m and n. These functions should be accessible to code outside the class. \(\bullet\) calc, a public virtual member function that returns the value of m times n. Next write the declaration for class \(\mathrm{D}\), which is derived from class \(\mathrm{B}\). The class's members should be \(\bullet\) \(\mathrm{q},\) a float. This variable should not be accessible to code outside the class but should be accessible to member functions in any class derived from class \(\mathrm{D}\) \(\bullet\) \(\mathrm{r},\) a float. This variable should not be accessible to code outside the class, but should be accessible to member functions in any class derived from class D. \(\bullet\) setQ, getQ, setR, and getR. These are the set and get functions for the member variables \(q\) and \(r .\) These functions should be accessible to code outside the class. \(\bullet\) calc, a public member function that overrides the base class calc function. This function should return the value of q times \(r\)
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