1. Introduction

In C++ programming, constructors are special member functions used to initialize objects. The copy constructor and parameterized constructor are two types of constructors that serve different purposes. A copy constructor initializes an object using another object of the same class, while a parameterized constructor initializes an object with specified values.

2. Key Points

1. The copy constructor creates a new object as a copy of an existing object.

2. A parameterized constructor initializes an object with given values, which can be of different types.

3. The copy constructor has only one parameter, typically a reference to the same class.

4. A parameterized constructor can have multiple parameters of various types.

3. Differences

Copy Constructor	Parameterized Constructor
Initializes a new object as a copy of an existing object.	Initializes a new object with specific values provided as arguments.
Has one parameter, a reference to an object of the same class.	Can have multiple parameters of different types.

4. Example

#include <iostream>
using namespace std;

class MyClass {
public:
    int x;

    // Parameterized constructor
    MyClass(int val) : x(val) {}

    // Copy constructor
    MyClass(const MyClass &obj) {
        x = obj.x;
    }
};

int main() {
    MyClass obj1(10); // Parameterized constructor
    MyClass obj2 = obj1; // Copy constructor

    cout << "obj1.x: " << obj1.x << endl;
    cout << "obj2.x (copy of obj1): " << obj2.x << endl;

    return 0;
}