object oriented programming using C# programming langauge 02

Object Oriented Programing [OOP]

Access Modifiers C# Keywords Indicate The Accessibility Scope

Access Modifiers C# Keywords Indicate The Accessibility Scope 1. Private 2. Private Protected 3. Protected 4. Internal 5. Protected Internal 6. Public From Less Accessible To Wider

Namesp ace C# Keywords Indicate The Accessibility Scope What You Can Write Inside Namespace ? 1. Class 2. Struct 3. Interface 4. Enum Access Modifier Allowed Inside Namespace ? 1. Internal [Default] 2. Public

Class Or Struct C# Keywords Indicate The Accessibility Scope What You Can Write Inside The Struct Or Class 1. Attributes [Fields] => Member Variable 2. Functions [Constructor , Getter Setter , Method] 3. Properties [Full Property , Automatic Property , Indexer] 4. Events

Class Or Struct C# Keywords Indicate The Accessibility Scope Access Modifier Allowed Inside Struct? 1. Private [Default] 2. Internal 3. Public Access Modifier Allowed Inside Class? 1. Private [Default] 2. Private Protected 3. Protected 4. Internal 5. Protected Internal 6. Public

Interfa ce C# Keywords Indicate The Accessibility Scope What You Can Write Inside The Interface ? 1. Signature For Property => C# 7.0 2. Signature For Method => C# 7.0 3. Default Implemented Method => C# 8.0 Feature .Net Core 3.1 [2019]

Enum An enum type is a special data type that enables for a variable to be a set of predefined constants

Delete Write Read Execute Bool [] Permissions = new bool[4]; Write Read Execute Delete T F T F 1 bool : 1 byte Bool[4] : 4 byte 1 byte : 8 bits 0 1 Write Read Execute Delete 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 128 64 32 16 8 4 2 1 Delete => 1 Execute => 2 Read => 4 Write => 8

Delete Write Read Execute Write Read Execute Delete 1 0 0 0 0 1 1 1 1 1 1 1 0 1 0 1 128 64 32 16 8 4 2 1 Delete => 1 Execute => 2 Read => 4 Write => 8 Decimal 8 7 15 5

Delete => 1 Execute => 2 Read => 4 Write => 8 1 => Delete 2 => Execute 3 => Delete , Execute 4 => Read 5 => Delete , Read 6 => Execute , Read 8 => Write 7 => Delete , Execute , Read 9 => Delete , Write 10 => Execute ,Write 11 => Delete , Execute , Write 12 => Read , Write 13 => Delete , Read , Write 14 => Execute , Read , Write 15 => Delete , Execute , Read , Write

Bitwise Operators : & => And | => OR ^ => XOR // If You Want To Add Permission [Read] => Do [XOR] Operation employee.Permissions = employee.Permissions ^ Permission.Read; 3 ^ 4 0 0 1 1 ^ 0 1 0 0 0 1 1 1 => 7 employee.Permissions = (Permission)3 ; // Delete , Execute Console.WriteLine(employee.Permissions); // Delete , Execute , Read // If You Want To Remove | Deny Permission [Read] => Do [XOR] Operation employee.Permissions = employee.Permissions ^ Permission.Read; 7 ^ 4 0 1 1 1 ^ 0 1 0 0 0 0 1 1 => 3

employee.Permissions & Permission.Delete 3 & 1 0 0 1 1 & 0 0 0 1 0 0 0 1 => 1 // If You Want To Check Whether a Specific Permission is Existed or Not => DO [AND] Operation Console.WriteLine(employee.Permissions); // Delete , Execute (employee.Permissions & Permission.Delete) == permission.Delete // True Bitwise Operators : & => And | => OR ^ => XOR

employee.Permissions = employee.Permissions | Permission.Delete 3 | 1 0 0 1 1 | 0 0 0 1 0 0 1 1 => 3 // If You Want To Add Permission => DO [OR] Operation // OR => If Permission Existed -> Do Nothing => If Permission is not Existed -> Will Be Added Console.WriteLine(employee.Permissions); // Delete , Execute Bitwise Operators : & => And | => OR ^ => XOR employee.Permissions = employee.Permissions | Permission.Read 3 | 4 0 0 1 1 | 0 1 0 0 0 1 1 1 => 7

Stru ct Stack Point P1 ; Y X 8 Bytes P1 = new Point(1,2); 2 1

Struct ● Value Type ● Support Encapsulation and Overloading in Polymorphism ● Doesn’t Support Inheritance ● 3 Access Modifier Allowed Inside It ● If You Defined a user defined Constructor , Compiler Will always Generate Parameterless Constructor

Session Content 1. What Is OOP 2. Encapsulation 3. Property 4. Indexer 5. Class 6. Inheritance 7. Access Modifier

OOP Definition OOP Consists Of 4 Pillars : 1. Encapsulation 2. Inheritance 3. Polymorphism 4. Abstraction

Encapsulation Separate Data Definition [Attributes] From Its Use [Getter Setter , Property]

Encapsulatio n Stack Employee Emp; Salary Name Id 24 Bytes Emp = new Employee (10 , “Aliaa” , 1000); 1000 10 StringRef Heap A M R

Indexer Is a Special Property [Named With Keyword This and Can Take Parameters]

Clas s C# Keywords Indicate The Accessibility Scope What You Can Write Inside The Class 1. Attributes [Fields] => Member Variable 2. Functions [Constructor , Getter Setter , Method] 3. Properties [Full Property , Automatic Property , Indexer] 4. Events

Cla ss C# Keywords Indicate The Accessibility Scope Access Modifier Allowed Inside Class? 1. Private [Default] 2. Private Protected 3. Protected 4. Internal 5. Protected Internal 6. Public

Cla ss C# Keywords Indicate The Accessibility Scope Constructor in Class : ● If There is no User defined Constructor , Compiler Will Always Generate Empty Parameterless constructor => Will do Nothing . ● If You defined a User defined Constructor , Compiler Will No Longer Generate Empty Parameterless constructor.

Cla ss Stack Heap Car C1; C1 C1 = new Car(10 , “BMW” , 290); Speed Model Id 290 10 StringRef B M W 16 Bytes

Class VS Struct ● Reference Type ● Value Type ● Support 4 Pillars Of OOP ● Support Encapsulation and Overloading in Polymorphism ● More Flexible ● Doesn’t Support Inheritance ● 6 Access Modifier Allowed Inside It ● Does Support Inheritance ● 3 Access Modifier Allowed Inside It ● If You Defined a user defined Constructor , Compiler Will no longer Generate Empty Parameterless Constructor ● If You Defined a user defined Constructor , Compiler Will always Generate Parameterless Constructor

Parent 1. Int X 2. Int Y 3. Ctor (int X , int Y) 4. Method Product [X* Y] Child 1. Int X 2. Int Y 3. Int Z 4. Ctor (int X , int Y ,int Z) 5. Method Product [X* Y*Z]

Relationships Between Classes 1. Inheritance 2. Association FulltimeEmployee : Employee Fulltime Employee is A Employee

Relationships Between Classes 1. Inheritance 2. Association Class Product { } Class OrderItem { Product Product ; } Association Composition Class Chair{} Class Room { chair[] Chairs; } Orderitem Has a Product Association Aggregation Room Has Chairs

object oriented programming using C# programming langauge 02

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