Object-oriented programming aims to implement real-world entities like inheritance, hiding, polymorphism, etc in programming.
The main aim of OOP is to bind together the data and the functions that operate on them so that no other part of the code can access this data except that function. Let us learn about the different characteristics of an Object Oriented Programming language: Object: Objects are basic run-time entities in an object-oriented system, objects are instances of a class, these are user-defined data types. Object take up space in memory and have an associated address like a record in pascal or structure or union in C.
Each object contains data and code to manipulate the data. Class: Class is a blueprint of data and functions or methods. Class does not take any space. By default class variables are private but in case of structure, it is public.
In the above example person is a class. Encapsulation and Data abstraction: Wrapping up combing of data and functions into a single unit is known as encapsulation. The data is not accessible to the outside world and only those functions which are wrapping in the class can access it. This insulation of the data from direct access by the program is called data hiding or information hiding.
Data abstraction refers to, providing only needed information to the outside world and hiding implementation details. For example, consider a class Complex with public functions as getReal and getImag. We may implement the class as an array of size 2 or as two variables.
Basic Concepts of Object Oriented Programming using C++
Had our implementation be public, we would not have been able to change it. Inheritance: inheritance is the process by which objects of one class acquire the properties of objects of another class. It supports the concept of hierarchical classification. Inheritance provides reusability. This means that we can add additional features to an existing class without modifying it.
I don't think you have to over sell OOP at this point. The advantages will be obvious soon enough. Hello Alex, I wrote a few thoughts regarding the difference between traditional procedural and object-oriented programming.
Could you please look and tell me if I understand this difference correctly? Sorry if it's too naively. Object oriented programming is a bit of a mental shift from traditional function-oriented programming, but once you get the hang of it it's hard to go back! Great tutorial! Do you plan on adding lessons about OOP design in general how to design good classes and relationship among them? That would be nice I guess.
Or if you don't contemplate that, can you suggest some good books,articles on this topic? Still feel like I'm kinda weak when it comes to understanding pointers and references, I know the stuff but it's not natural I would sometime use a value instead of a reference for example for a swap function and realize after it wouldn't work. How can I make it stick in my head clearly?
It's hard to answer this question since pointers and references are used in multiple context. Is your question focused around when to use pointers and references in the context of passing values to functions? I don't exactly understand what happens when a variable is passed to a function that takes in references, like in the swap function. Nothing happens to the variable argument. It stays as it is. When the function is called, the reference parameter is created, and set to reference the argument.
Then, within the function, the reference parameter can be used as if it were the original argument. At the end of the function, the reference is destroyed, but the original argument remains. Note that because the reference is treated as if it were the original argument, any changes to the referenced value change the argument!
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Clears up the muddied waters nicely. It seems that one needs to think in terms of Object-Oriented rather than just as an Object to be oriented. Think I get it. Hi Alex- In this brief introduction to object-oriented-programming you talk about objects a lot but as far as I can tell you never really define what an object is. You may have done this in a previous chapter and, if so I apologize for my ignorance. If they are also objects what is are their datatype s?
Second; should we then consider functions to be variables? Alex, you and Stroustrup write really cool sometimes inscrutable to me text. It's really helpful to be able to cross-reference as well have this blog. Thanks Garry. The term "object" is used in two different contexts. In the non-OOP sense, an object is as Stroustrup says. However, when we use the term object in an OOP sense, we mean something more: an object that combines both properties and behaviors.
I rewrote this lesson a bit to try and make it clearer how OOP differs from traditional programming, and also how the term "object" is overloaded a bit. Yes, because name and age are dynamically allocated, you'll need to delete them in the constructor. Because anil is also dynamically allocated, you'll need to delete it as well. Alex, thank you once again! I've never read such a clear and good composed programing tutorial on english.
I have one offtop question. For example, I want to write win32 application that will randomly generate 2D labirinth in console window. All of the content in these tutorials are potentially useful for game design. In addition, a good working knowledge of algorithms and data structures will help. You'll also need to learn more about outputting if you're making a text-based game, maybe using the curses library -- if you're making a graphical game, maybe using the SDL library. Alex, I've found such tasks at CodinGame site I hope you do not take it for advertising.
If you really want to learn C, this is the wrong site. Just start with chapter 0 and keep reading. Dear Alex, I'll be very excited, If I understand the phrase "never use a small word where a big one will do" Would you mind give me a hint? Aspiring writers are often given the advice to "never use a long word where a short one will do".
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In other words, favor short words instead of long ones, because short words are easier to read and understand. So I was making a joke about this. Hey Alex, are you able to put up tasks for OOP?
C++ Classes and Objects
It would be of great help as it gets more confusing at this point. I'd like to know how object oriented programming is associated with making some GUI applications. Which GUI library to use is really outside the scope of this tutorial and my expertise. There are a ton of factors involved in picking the right one, including cost, whether you need cross-platform compatibility, etc This might sound like a daft question but does everything in oop other than main have to be an object i.
I have some code that creates and displays a popup message box which is extremely short lived 1 key press. It seems a bit daft to put it in a class where I must declare a dynamic object then call a method and then delete the object rather than just call a function. That said, I do not want to get into bad habits while I am learning.
You can mix both traditional and object oriented programming.