C++ Constructor

In C++, constructor is a special method which is invoked automatically at the time of object creation. It is used to initialize the data members of new object generally. The constructor in C++ has the same name as class or structure.

There can be two types of constructors in C++.

• Default constructor
• Parameterized constructor

C++ Default Constructor

A constructor which has no argument is known as default constructor. It is invoked at the time of creating object.

Let’s see the simple example of C++ default Constructor.

Output:

Default Constructor Invoked  Default Constructor Invoked 

C++ Parameterized Constructor

A constructor which has parameters is called parameterized constructor. It is used to provide different values to distinct objects.

Let’s see the simple example of C++ Parameterized Constructor.

#include <iostream> using namespace std; class Employee {    public:        int id;//data member (also instance variable)            string name;//data member(also instance variable)        float salary;        Employee(int i, string n, float s)           {               id = i;               name = n;               salary = s;         }          void display()           {               cout<<id<<"  "<<name<<"  "<<salary<<endl;           }   }; int main(void) {     Employee e1 =Employee(101, "tutor", 890000); //creating an object of Employee      Employee e2=Employee(102, "Nakul", 59000);      e1.display();       e2.display();       return 0; } 

Output:

101  tutor  890000 102  Nakul  59000