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Inheritance in C++ Interview Questions & Answers - Learning Mode
COOLINTERVIEW.COM C++ INTERVIEW QUESTIONS INHERITANCE IN C++ INTERVIEW QUESTIONS QUESTIONS & ANSWERS - LEARNING MODE

Inheritance in C++ Interview Questions & Answers - Learning Mode

An existing class that is "parent" of a new class is called a base class. New class that inherits properties of the base class is called a derived class. Inheritance is a technique of code reuse. It also provides possibility to extend existing classes by creating derived classes. In C++, we have 5 different types of Inheritance. Namely, Single Inheritance Multiple Inheritance Hierarchical Inheritance Multilevel Inheritance Hybrid Inheritance (also known as Virtual Inheritance).

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Inheritance in C++ Interview Questions & Answers - Learning Mode
Try Inheritance in C++ Interview Questions & Answers - Exam Mode
Question: What is the difference between composition and inheritance?

Answer: Composition is the technique of combining the simpler data types with the complex data types e.g. function calls within the calling function.<br>Inheritance is one, in which one can acquire the property of other.. Source: CoolInterview.com
Question: What do you mean by inheritance?

Answer: Inheritance is the process of creating new classes, called derived classes, from existing classes or<br>base classes. The derived class inherits all the capabilities of the base class, but can add <br>embellishments and refinements of its own. Source: CoolInterview.com
Question: Is there any way to write a class such that no class can be inherited from it. Please include code



Answer: Simple, make all constructors of the class private. Source: CoolInterview.com
Question: What is RTTI?

Answer: Runtime type identification (RTTI) lets you find the dynamic type of an object when you have only a
pointer or a reference to the base type. RTTI is the official way in standard C++ to discover the type of an object and to convert the type of a pointer or reference (that is, dynamic typing). The need came from practical experience with C++. RTTI replaces many homegrown versions with a solid, consistent approach. Source: CoolInterview.com
Question: what is the use of volatile keyword? Give me one example?



Answer: (P876 from textbook C++ How To Program:)
The volatile type qualifier is applied to a definition of a variable that may be altered from outside the program (i.e., the variable is not completely under the control of the program). Thus, the compiler cannot perform optimizations (such as speeding program execution or reducing memory consumption, for example) that depend on "knowing a variable's behavior is influenced only by program activities the compiler can observe."

(notes:)
1) Source: CoolInterview.com
Question: what are the advantages and disadvantages of inheritance?

Answer: we can call many classes by using one class. for ex;;<br> class a1<br>{<br>int a;<br>public:<br>void get()<br>{<br>cout<<"<br>enter number";<br>cin>>a;<br>}<br>void dis()<br>{<br>cout<<"<br>number is"<<a;<br>}<br>};<br>class d1<br>{<br>int d;<br>public:<br>void get1()<br>{<br>get();<br>cout<<"enter number";<br>cin> Source: CoolInterview.com
Question: What does inheritance means in C++? What are the different forms of inheritance? Give an example for each.

Answer: when a class is derived from another predifined class,then the process of deriving is known as inheritance. different forms of inheritance are single inheritance ,multiple,multilevel, and hierarchical. Source: CoolInterview.com
Question: If a base class has a bunch of overloaded constructors, and an inherited class has another bunch of overloaded constructors, can you enforce a call from an inherited constructor to an arbitrary base constructor?

Answer: Yes, just place a colon, and then keyword base (parameter list to invoke the appropriate constructor) in the overloaded constructor definition inside the inherited class. Source: CoolInterview.com
Question: Why Call by reference technique is used in case of Copy constructor & not call by value?

Answer: MyClass(const MyClass& obj);
MyClass(Myclass obj);

In the latter one, compiler need to create a local copy of 'obj' which in turn involves the call to copy constructor,, which will create a copy of obj..which........and so on

However, in former case only one copy is created which is what we need.

Correct me if I am wrong. Source: CoolInterview.com
Question: Does a class inherit the constructors of its superclass?

Answer: A class does not inherit constructors from any of its super classes. Source: CoolInterview.com
Question: What is the difference between superclass and subclass?

Answer: A super class is a class that is inherited whereas sub class is a class that does the inheriting. Source: CoolInterview.com
Question: What Is The Use of VirtualDestructer?

Answer: Virtual destructor is used for the polymorphic decomposition of allocated resources. Source: CoolInterview.com
Question: How to create object for singleton class?

Answer: No answer available currently.
Question: If a class is declared without any access modifiers, where may the class be accessed?

Answer: A class that is declared without any access modifiers is said to have package access. This means that the class can only be accessed by other classes and interfaces that are defined within the same package. Source: CoolInterview.com
Question: What is a modifier?

Answer: A modifier, also called a modifying function is a member function that changes the value of at least one data member. In other words, an operation that modifies the state of an object. Modifiers are also known as ?mutators?. Example: The function mod is a modifier in the following code snippet:

class test
{
int x,y;
public:
test()
{
x=0; y=0;
}
void mod()
{
x=10;
y=15;
}
}; Source: CoolInterview.com
Question: it possible to inherit the private member in drived class?



Answer: yes, if the derived class is inheriting from base class with private access level<br><br>class derived : private base<br> Source: CoolInterview.com
Question: Explain the ISA and HASA class relationships. How would you implement each in a class design?

Answer: A specialized class "is" a specialization of another class and, therefore, has the ISA relationship with the other class. An Employee ISA Person. This relationship is best implemented with inheritance. Employee is derived from Person. A class may have an instance of another class. For example, an employee "has" a salary, therefore the Employee class has the HASA relationship with the Salary class. This relationship is best implemented by embedding an object of the Salary class in the Employee cl Source: CoolInterview.com
Question: Virtual constructor: Constructors cannot be virtual. Declaring a constructor as a virtual function is a syntax error. Does c++ support multilevel and multiple inheritance?


Answer: Yes. Source: CoolInterview.com
Question: Can you allow class to be inherited, but prevent the method from being over-ridden?

Answer: Yes, just leave the class public and make the method sealed Source: CoolInterview.com
Question: What do you mean by inheritance?




Answer: Inheritance in C++ <br>Recall that inheritance is a means of specifying hierarchical relationships between types <br> <br>C++ classes? can inherit both data and function members?? from other (parent) classes? <br> <br>In addition, they inherit the "is a" relationship so that an object of a class? SortedList (which inherits from class? List) can be treated as an object of class? List in most cases <br> <br>Terminology: "the child (or derived) class? inher Source: CoolInterview.com

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