object oriented programming using C# programming langauge 01

object oriented programming using C# programming langauge 01

• 1.
  Object Oriented Programing [OOP]
• 2.
  Session Content 1. Exception Handling 2.Access Modifiers 3. Enum 4. Struct 5. What Is OOP
• 3.
  Exception Handling // Exceptions //1. System Exceptions //// 1.1 Format Exception //// 1.2 Index Out Of Range Exception //// 1.3 Null Reference Exception //// 1.4 Invalid Operation Exception //// 1.5 Arithmetic Exception //// 1.5.1 Divided By Zero Exception //// 1.5.2 Overflow Exception // 2. Application Exception
• 4.
  Access Modifiers C# KeywordsIndicate The Accessibility Scope
• 5.
  Access Modifiers C# KeywordsIndicate The Accessibility Scope 1. Private 2. Private Protected 3. Protected 4. Internal 5. Protected Internal 6. Public From Less Accessible To Wider
• 6.
  Namesp ace C# Keywords IndicateThe 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
• 7.
  Class Or Struct C# KeywordsIndicate 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
• 8.
  Class Or Struct C# KeywordsIndicate 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
• 9.
  Interfa ce C# Keywords IndicateThe 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]
• 10.
  Enum An enum typeis a special data type that enables for a variable to be a set of predefined constants
• 11.
  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
• 12.
  Delete Write Read Execute Write Read ExecuteDelete 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
• 13.
  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
• 14.
  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
• 15.
  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
• 16.
  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
• 17.
  Struct
• 18.
  Stru ct Stack Point P1 ; Y X 8Bytes P1 = new Point(1,2); 2 1
• 19.
  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
• 20.
  OOP Definition OOP ConsistsOf 4 Pillars : 1. Encapsulation 2. Inheritance 3. Polymorphism 4. Abstraction