ABSTRACT CLASS - Object-Oriented Programming (OOP) Abstract Class என்பது OOP-ல் Abstraction + Inheritance + P……
ABSTRACT CLASS – Object-Oriented Programming (OOP)
Abstract Class என்பது நேரடியாக object உருவாக்க முடியாத ஒரு class. C++-ல் ஒரு class-க்குள் குறைந்தது ஒரு Pure Virtual Function இருந்தால் அந்த class: Abstract Class ஆகிறது. Simple definition: An abstract class is a class that cannot be insta…
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Definition
Abstract Class என்பது நேரடியாக object உருவாக்க முடியாத ஒரு class. C++-ல் ஒரு class-க்குள் குறைந்தது ஒரு Pure ……
Simple Explanation
ஒரு Shape என்ற concept எடுத்துக்கொள்வோம். Shapes: Circle Rectangle Triangle இவை எல்லாமே shapes. அதனால் common……
Explanation
Example
Shape | area() = 0 / \ Circle……
Explanation
Pure virtual function
Abstract class புரிய Pure Virtual Function முதலில் புரிய வேண்டும். Pure Virtual Function Definition Base clas……
Important
இங்கே: = 0 என்பது: display() function 0 return செய்கிறது என்று……
Syntax
Abstract class basic syntax
Explanation
virtual void functionName() =……
Program
Example
Explanation
virtual void area() = 0; }; Shape ஒரு abstract class. WHY ABSTRACT? இதைக் கொண்டு: Shape s; object ……
Explanation
virtual void area() = 0; };…
Explanation
c.area(); return 0; }…
Explanation
Line 1 class Shape Shape என்ற base class உருவாக்கப்படுகிறது. Pure Virtual Function virtual void area() = 0; இ……
Program
Example
Explanation
Circle concrete class. WHAT I……
Program
Example
Explanation
virtual void area() = 0; };…
Explanation
Circle area() implement செய்யவில்லை. அப்போது: Circle also remains Abstract So: Circle c; invalid. IMPORTANT R……
Program
Derived
Explanation
move() implement செய்யவில்லை.……
Program
Now
Explanation
Object: Dog d; valid. ABSTRACT CLASS CAN HAVE NORMAL FUNCTIONS முக்கியமான misconception: Abstract class-ல் pu……
Program
EXAMPLE
Explanation
virtual void area() = 0; }; இங்கே: message() ……
Explanation
virtual void area() = 0; };…
Explanation
return 0; }…
So abstract class-லிருந்து inherited normal fun……
Program
Example
Explanation
string name; public: virtual void calculateSalary() = 0; }; இங்கே: name ஒரு normal data member. calculateSala……
Program
EXAMPLE
Explanation
virtual void show() = 0; };…
Explanation
return 0; }…
Even though Base is abstract: Base constructor executes CAN ABSTRACT CLASS HAVE DESTRUCTOR? Yes. Abstr……
Program
Example
Explanation
virtual void area() = 0;…
Explanation
இங்கே ஒரு முக்கிய distinction: Shape s; Not allowed. ஆனால்: Shape *pt……
Explanation
virtual void sound() = 0; };…
Explanation
Animal *ptr = &d;…
Explanation
return 0; }…
இது மிக முக்கியமான concept. Abstract Base Pointer ↓ Derived Object ↓ Virtual Function ↓ Runtime Polymorphism ……
Program
Example
Explanation
virtual void draw() = 0; }; Derived classes: Circle Rectangle Triangle எல்லாம் தங்களது draw() implementation ……
Explanation
virtual void pay() = 0; }; De……
Explanation
இதில்: Payment ↓ What operation is required? UPI/Card ↓ How operation is performed? ABSTRACT CL……
Definition
Meaning
இந்த base class-ஐ inherit செய்யும் concrete derived class login() functionality provide செய்ய வேண்ட……
Explanation
Example
Shape ↓ area() required Circle ↓ πr……
Comparison
Abstract Class vs Normal Class
Comparison
ABSTRACT CLASS vs PURE VIRTUAL FUNCTION இர……
Explanation
Example
virtual void show() = 0; Abstract……
Explanation
Here: show() → Pure Virtual Funct……
Explanation
Memory: Abstraction =…
Concept
Abstract Class = Implementation mechanism ABSTRACT CLASS vs INTERFACE C++-ல் Java/C# மாதிரி separate interfac……
Concept
Employee | |-- FullTimeEmployee | calculateSalary() | |-- PartTimeEmployee calculateSalary() Same operation: ……
Program
Example
Explanation
virtual void area() = 0; };…
Explanation
override பயன்படுத்துவது நல்ல practice. Compiler-க்கும் override mistake detect செய்ய உதவும். WHY override USE……
Program
Example
Explanation
No data members. Still abstract. CAN AN ABSTRACT CLASS HAVE ONLY ONE PURE VIRTUAL FUNCTION? Yes.……
Program
Example
Explanation
Derived concrete class இந்த மூன்றையும் implement செய்ய வேண்டும். CAN ABSTRACT CLASS BE INHERI……
Program
Example
Explanation
virtual void show() = 0; }; B abstract class. CAN ABSTRACT CLASS HAVE STATIC MEMB……
Important
Abstract class-ன் direct object create செய்ய முடியாது. At least one pure virtual function இருந்தால் class abs……
Common Mistake
Error 1
Abstract Class Object Creation Wr……
Common Mistake
Error 2
Thinking = 0 returns zero virtual int calculate() = 0; இங்க……
Common Mistake
Error 3
Derived class not implementing function Base: v……
Common Mistake
Error 4
Wrong Function Signature Base: virtual void show(int x) = 0; Derived: void show(……
Common Mistake
Error 5
Thinking abstract class cannot have constructor Wrong assumption……
Remember
A = Abstract A = Alone object cannot be created மேலும்: P = Pure Virtual Function P present ↓ A = Abstract Cl……
TRB Point
Question 1
What is an abstract class? Answer: A class ……
TRB Point
Question 2
Can an abstract class be inst……
TRB Point
Question 3
Syntax of pure virtual functi……
TRB Point
Question 4
What does = 0 indicate? Answe……
TRB Point
Question 5
Can abstract class have norma……
TRB Point
Question 6
Can abstract class have data ……
TRB Point
Question 7
Can abstract class have const……
TRB Point
Question 8
Can an abstract class pointer……
Explanation
Example
Shape *ptr;…
TRB Point
Question 9
What happens if a derived class does not implemen……
TRB Point
Question 10
Does C++ have an abstract key……
Interview Point
What is an abstract class? An abstract class is a class that cannot be instantiated directly and contains one……
MCQ
An abstract class in C++ cont……
MCQ
Which is pure virtual syntax?…
MCQ
Can an abstract class object ……
MCQ
Can an abstract class have a ……
MCQ
Can an abstract class contain……
MCQ
If a derived class does not o……
MCQ
What does =0 in a virtual fun……
MCQ
Which is allowed?…
MCQ
Abstract classes are commonly……
MCQ
C++ uses which keyword to dec……
MCQ
Which OOP feature is strongly……
MCQ
An abstract class can contain:…
Practice
Study: class Vehicle { public: virtual void start() = 0; }; ……
Summary
ABSTRACT CLASS | |-- Cannot instantiate directly | |-- Contains at least one | pure virtual function | |-- Pu……
Explanation
Short description
Abstract Class என்பது நேரடியாக object உருவாக்க முடியாத class. C++-ல் குறைந்தது ஒரு pure virtual function (vir……
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