4th Lecture

4th Lecture

.OOPs - Object Oriented Programming Structure.

>OOPs is a new programming technique which emphasizes on security and reusability. It is an approach to analyse problems and developing solution in form of objects. OOPs is

all about classes and objects.

>class- a class is a user defines data type or a template. It is used to group data of different types and functions to operate on data. Class defines shape and behaviour

of objects. once a class is defined , we can create any number of objects.

>object- is an instance of class. an objct is a collection of properties and members . A property stores data for an object and method performs action on stored data.

>input,Store,Process And ouptput

>Variable- A variable stores single vlaue.

>structure we can group data of different type.

>there are five principles of OOPs

.encapulation-

process of wrapping up data and function as a single unit.

.polymorphism-

.data hiding-

protecting data from outside world by making it private.

.inheritence-

ceating new class from existing class.Existing class is known as base parent or super and new class is knoqwn as sub\drive\child class. A suvb class can

use base class's code. change existing code (if allowed) and add up new code

c# supports single multilevel inheritence.

.abstraction-

hidng unessential details and exposing out essential details.

using systems.windows.Forms;

class DAV:Form

{

}

class s

{

s}tatic void main()

{

DAV obj=new DAV();

obj.showDialoge();

}

}