Abstract Class Example Program In C

Classes inheriting an abstract class must provide definition to the pure virtual function otherwise they will also become abstract class.

Abstract class example program in c. Such a class is called abstract class. Abstract class acts as a base class and is designed to be inherited by subclasses that either implement or either override its method. Abstract class and pure virtual function in c. Abstract class is a class which contains atleast one pure virtual function in it.

2 minutes to read 2. For example the following function is a pure virtual function. Abstract class is used in situation when we have partial set of implementation of methods in a class. You cannot create an object of an abstract class type.

We cannot provide implementation of function draw in shape but we know every derived class must have implementation of draw. Abstract classes act as expressions of general concepts from which more specific classes can be derived. Pure virtual functions and abstract classes in c. For example consider a class have four methods.

An interface describes the behavior or capabilities of a c class without committing to a particular implementation of that class. The object cannot be created for abstract class but pointer can be created which can be pointed to the derived class. In c we use terms abstract class and interface interchangeably. However you can use pointers and references to abstract class types.

Abstract classes c 11042016. Sometimes implementation of all function cannot be provided in a base class because we dont know the implementation. A pure virtual function in. Then use an abstract class to further refine an implementation for a set of concrete classes and lastly define the set of concrete classes.

For example let shape be a base class. You declare a pure virtual function by using a pure. See the following syntax. A class with pure virtual function is known as abstract class.

In these kind of situations we should use abstract class. Abstract classes are used to provide an interface for its sub classes. This is a guide to abstract class in c. See the following example.

Out of four methods we have an implementation of two methods and we need derived class to implement other two methods. A class is the abstract if it has at least one pure virtual function. Abstract class in c example c abstract class tutorial abstract class in c. Syntax for declaring a virtual function.

Now coming to an. A typical example of an abstract class is given below. Here we discuss the introduction to abstract class as well as the implementation of constructor and destructor in c along with its example. Virtual void fun 0.

Below is the definition of a class called animal when the animal class is defined there is nothing known about the animal whether it is a dog or a cat.