CPP

How to make copy constructor in c++

#include <iostream>
using namespace std;

// declare a class
class Wall {
  private:
    double length;
    double height;

  public:

    // initialize variables with parameterized constructor
    Wall(double len, double hgt) {
      length = len;
      height = hgt;
    }

    // copy constructor with a Wall object as parameter
    // copies data of the obj parameter
    Wall(Wall &obj) {
      length = obj.length;
      height = obj.height;
    }

    double calculateArea() {
      return length * height;
    }
};

int main() {
  // create an object of Wall class
  Wall wall1(10.5, 8.6);

  // copy contents of wall1 to wall2
  Wall wall2 = wall1;

  // print areas of wall1 and wall2
  cout << "Area of Wall 1: " << wall1.calculateArea() << endl;
  cout << "Area of Wall 2: " << wall2.calculateArea();

  return 0;
}

copy constructor c++ syntax

Point(const Point &p2) {x = p2.x; y = p2.y; } 

copy constructor in c++ questions

#include<iostream> 
using namespace std; 
class ABC { 
 public:ABC(){
    cout<<"Constructor is called automatically";
    cout<<"at the time of execution"<<endl;
 }
 void display(){
        cout<<"hello world";
 } 
}; 

int main() { 
 ABC ob1,ob2;
 ob1.display();
 ob2.display();
 return 0;  
}