Basic concept of oops
- 1. Programming with c++ By P.Kaleeshwaran(181615) II B.Sc Mathematics(CA) SBK College,Aruppukottai To K.Padma Priya M.Sc(cs),M.Phill. Assistent Profecser Dept of Mathematics(CA) SBK College,Aruppukottai
- 2. Basicconceptsof object – oriented programming Objects Classes Data abstraction and encapsulation Inheritance Polymorphism Dynamic binding Message passing
- 3. Object : Object are the basic run-time entities in the object-oriended system. They may also represent user-defined data such as vectors,time and lists. When a program is executed, the object by sending messages to one another. Each object contains data, and code to manipulate the data.
- 4. Two ways of represending an object. Object:STUDENT DATA Name Date of birth Marks ……… FUNCTIONS Total Average Display …….. STUDENT Total Average Display
- 5. Classes: The entire set of data and code of an object can be made a user-defined data type with the help of a class. Each object is associated with the data of type class with which they are created. A class is thus a collection of object of similar type. fruit mango; Will create an object mango belonging to the class fruit.
- 6. Data abstraction and encapsulation: ENCAPSULATION The wrapping up of data and function into a single unit is known as encapsulation. Data encapsulation is the most striking feature of a class. The insulation of the data from direct access by program is called data hiding or information hinding.
- 7. ABSTRACTION Abstraction refers to the act of representing essential without including the background details or explanations. The attributes are sometimes called data member because they hold information. The function that operate on these data are sometimes called methods or member function. Since the classes use the concept of data abstraction they are known as abstract data types(ADT).
- 8. Inheritance Inheritance is the process by which object of class acquire the properties of object of another class. It supports the concept of hierarchical classification. In OOP, the concept of inheritance provides the idea of reusability This is possible by deriving a new class from the existing one.
- 10. Polymorphism Polymorphism is another important OOP concept. The behaviors depends upon the types of data used in data used in the operation. The process of making an operator to exhibit different behaviors in different instances is known as operator overloading Using a single function name to perform different types of tasks is known as function overloading.
- 11. Polymorphism plays an important roll in allowing objects having different internal structure to share the same external interface. Shape Draw() Triangle object Draw( triangle) Circle object Draw (circle) Box object Draw (box)
- 12. Dynamic binding: Dynamic binding means that code associated with a given procedure call is not known util the time of the call at run-time. A function call associated with a plomorphic reference depends on the dynamic type of that reference.
- 13. Message passing: An object-oriented program consists of a set of object that communication with each other. o Creating classes that define objects and their behavior. o Creating objects from class definitions. o Establishing communication among objects. Object communication with one another by sending and receiving information much the same way as people pass message to one another.
- 14. Message passing involves specifying the name of the object, the name of the function and the information to be send. employee.salary(name); Object information message Object have a life cycle.They can be created and destroyed.
- 15. thank You