🟣 OOP · Lesson 40

Destructors in C++

What is Destructors in C++?

Destructors in C++
A destructor is a special member function that runs automatically when an object is destroyed. It is used for cleanup work.

Level
🟣 Object-Oriented Programming

Example File
destructors.cpp

Main Focus
Concept + syntax + practical C++ program

Why should you learn this?

It helps you write correct and readable C++ programs.
It is used repeatedly in school practicals, projects and competitive programming.
It builds the base for advanced topics such as OOP, STL and data structures.

Important Terms

Term	Meaning / Use
destructor	Destructors in C++ programming में Destructor use होता है।
cleanup	Destructors in C++ programming में Cleanup use होता है।
resource release	Destructors in C++ programming में Resource release use होता है।
~ClassName	~Destructors in C++ programming में classname use होता है।

Syntax / Pattern

C++

~ClassName() { cleanup; }

Example Program

main.cpp

#include <iostream>
using namespace std;
class Demo{
public:
    Demo(){ cout << "Created
"; }
    ~Demo(){ cout << "Destroyed"; }
};
int main(){
    Demo d;
    return 0;
}

Expected Output

Created Destroyed

Program Explanation

Constructor runs when object d is created.
Destructor runs automatically when d goes out of scope.

Exam Tip: In C++ practical answers, write the logic first, then the program, then expected output. For theory, always include one suitable example.

Where will you use it?

closing files
releasing memory
cleanup

Common Mistakes

Calling destructor manually unnecessarily.
Expecting destructor to accept arguments.

Practice Tasks

Create class that prints constructor/destructor messages.
Explain destructor use in file handling.

Summary

Destructors in C++ एक ज़रूरी C++ topic है। परिभाषा सीखें, syntax समझें, example program चलाएं और फिर practice tasks हल करके concept मज़बूत करें।

Destructors in C++ क्या है?

Destructors in C++
A destructor is a special member function that runs automatically when an object is destroyed. It is used for cleanup work.

Level
🟣 Object-Oriented Programming

Example File
destructors.cpp

मुख्य फोकस
Concept + syntax + practical C++ program

इसे क्यों सीखें?

यह आपको सही और पढ़ने-योग्य C++ programs लिखने में मदद करता है।
यह school practicals, projects और competitive programming में बार-बार use होता है।
यह OOP, STL और data structures जैसे advanced topics की नींव बनाता है।

ज़रूरी Terms

Term	अर्थ / उपयोग
destructor	Destructor Destructors in C++ programming में use होता है।
cleanup	Cleanup Destructors in C++ programming में use होता है।
resource release	Resource release Destructors in C++ programming में use होता है।
~ClassName	~classname Destructors in C++ programming में use होता है।

Syntax / Pattern

C++

~ClassName() { cleanup; }

Example Program

main.cpp

#include <iostream>
using namespace std;
class Demo{
public:
    Demo(){ cout << "Created
"; }
    ~Demo(){ cout << "Destroyed"; }
};
int main(){
    Demo d;
    return 0;
}

Expected Output

Created Destroyed

Program Explanation

Constructor runs when object d is created.
Destructor runs automatically when d goes out of scope.

Exam Tip: In C++ practical answers, write the logic first, then the program, then expected output. For theory, always include one suitable example.

Where will you use it?

closing files
releasing memory
cleanup

आम गलतियाँ (Common Mistakes)

Calling destructor manually unnecessarily.
Expecting destructor to accept arguments.

अभ्यास (Practice Tasks)

Create class that prints constructor/destructor messages.
Explain destructor use in file handling.

सारांश

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