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C++ ConstructorIn 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++.
C++ Default ConstructorA 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. #include <iostream> using namespace std; class Employee { public: Employee() { cout<<"Default Constructor Invoked"<<endl; } }; int main(void) { Employee e1; //creating an object of Employee Employee e2; return 0; } Output: Default Constructor Invoked Default Constructor Invoked C++ Parameterized ConstructorA 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, "Sonoo", 890000); //creating an object of Employee Employee e2=Employee(102, "Nakul", 59000); e1.display(); e2.display(); return 0; } Output: 101 Sonoo 890000 102 Nakul 59000
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