what are the roles of constructor and destructor? write a program to demonstrate parameterized and copy constructor.

 Constructors and destructors are special member functions in C++ classes that have specific roles:

1. Constructors: To initialize objects of a class when they are created. They ensure that objects are properly initialized with default or user-defined values, so that they are ready for use.
2. Destructors: To deallocate memory and release resources when an object of a class is destroyed. They ensure that objects are properly cleaned up and memory is freed, to prevent memory leaks and other related issues.

Here is an example program that demonstrates a parameterized constructor and a copy constructor:

#include <iostream>

#include <string>

using namespace std;

class MyClass {

private:

    int value;

    string name;

public:

    // parameterized constructor

    MyClass(int v, string n) {

        value = v;

        name = n;

        cout << "Parameterized constructor called for " << name << endl;

    }

    // copy constructor

    MyClass(const MyClass& obj) {

        value = obj.value;

        name = obj.name + " (copy)";

        cout << "Copy constructor called for " << name << endl;

    }

    ~MyClass() {

        cout << "Destructor called for " << name << endl;

    }

    void display() {

        cout << "Name: " << name << endl;

        cout << "Value: " << value << endl;

    }

};

int main() {

    // create an object using parameterized constructor

    MyClass obj1(10, "Object 1");

    obj1.display();

    // create a copy of the object using copy constructor

    MyClass obj2 = obj1;

    obj2.display();

    return 0;

}