What is hierarchical inheritence in c plus plus?

Answer 1

Inheritance is used to define a subclass of a common ancestor. In other words, if you have a class that performs a set of functions, then a class that uses inheritance would have all the functions of the parent class plus additional or modified functions unique to that specific subclass. This allows developers to group common functionality into one class, then provide overrides and additional functionality to child classes. This facilitates code reuse, reduction of code duplication, and polymorphic functions that can operate on several different types of objects using the same base code.

Answer 2

Fortunately,C++ strongly support the concept of re-usability .the C++classes can be reused in several ways.Once a class has been written and tested ,it can be adapted by other programmers to suit their requirements.This is basically done by creating new classes, reusing the properties of the existing ones.This mechanism of deriving new class form an old one is called inheritance.

Answer 3

There are 5 types of inheritance in C++. Using classes named A, B and C, we can describe all 5 as follows:

1. Single Inheritance: where A inherits from B.

2. Multilevel Inheritance: where A inherits from B and B inherits from C.

3. Hierarchical Inheritance: where A and B both inherit from C.

4. Multiple Inheritance: where A inherits from both B and C.

5. Hybrid Inheritance: Any combination of the above.

A typical example of hybrid inheritance is a combination of multiple inheritance and hierarchical inheritance, such that A inherits from both B and C (multiple inheritance), while B and C both inherit from D (hierarchical inheritance). In this situation, A inherits two indirect instances of D. That is, A::B::D and A::C::D. This creates ambiguity because you cannot implicitly refer to A::D. To remove the ambiguity, we can specify D as being a virtual base class of both B and C. When we do this, the most-derived class, A, invokes the D constructor, while B and C both share this one instance of D, virtually.

Answer 4

Inheritance simply means to derive a new class of object from an existing base class. The derived class inherits all the public and protected members of the base class, so the code in the base class can be re-used to suit a specific purpose, without having to rewrite all the code in the base class.

Answer 5

Hierarchical inheritance is simply a way of describing how derived classes relate to their base class or classes, similar to a family tree.

At the top of the tree is the base class. Below it are all the classes that derive from that base class. And below each of those are all the classes that derive from them. And so on.

Multiple inheritance, where a class is derived from two or more classes, tends to mess up the analogy slightly, because two classes may inherit from the same base class. For instance, suppose class A is the base class that forms the root, and class B and C both derive from A. If class D is derived from both B and C, then class D inherits two separate instances of class A -- one from B, the other from C. This introduces an ambiguity: when you call a method of A from within D, the compiler won't know which instance of A you are actually referring to unless you call the method explicitly via B or C. In other words, you must work up the hierarchical tree of inheritance via the correct branch to ensure the correct method is called.

Answer 6

It is the inheritance which is a combination of two or more inheritance of the following : single, multiple,multilevel and hierarchal