What is the need of classes for OOPS programming language?

Object-Oriented Programming has the following reasons to be used: 1) OOP provides a clear modular structure for programs. 2) OOP makes it easy to maintain and modify existing code. 3) OOP provides a good framework for code libraries where supplied software components can be easily adapted and modified by the programmer. 4) Code reusability. 5) It is suitable for real word problems and real world works. Few more points for better understanding are: Why? Because if you stick to the rules, it makes complex code easier to develop, reliable, maintainable, and generally better. OOP insists that you think about what you expose to the outside world, it lets you change the implementation of an object without affecting any other code. (Encapsulation) It allows you to have many different functions, all with the same name, all doing the same job, but on different data. (Polymorphism) It lets you write a set of functions then expand them in the different directions without changing or copying them in any way. (Inheritance).

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Following two concepts explain everything about the use of OOPs. 1. Duplicate code is bad. 2. Code will always be changed. So, above statement proves, OOPs is provides code reusability which reduces the duplication of code because once you have duplicate code, you have made changes everywhere which leads to performance. The code can be changed anytime or requirement of application changed anytime so when you want to make changes in your application, OOPs makes it easier. Features of OOPs. There are three main features of OOPS. 1. Abstraction: Learn abstraction here (PHP 5 Abstract classes and Methods) 2. Polymorphism: It is a feature that allows one interface to be used for a general class of actions. It's an operation and may exhibit the different behavior in different instances. 3. Inheritance: The process by which one class acquires the properties and functionalities of another class. Inheritance provides the idea of reusability of code and each sub-class defines only those features that are unique to it.

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