🟣 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	Destructor used in Destructors in C++ programming.
cleanup	Cleanup used in Destructors in C++ programming.
resource release	Resource release used in Destructors in C++ programming.
~ClassName	~classname used in Destructors in C++ programming.

Syntax / Pattern

~ClassName() { cleanup; }

Example Program

#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++ is an important C++ topic. Learn the definition, understand the syntax, run the example program and then solve the practice tasks to make the concept strong.