A constructor is a special member function whose name is as that of its class name. It is used to initialize an object. A constructor has no return type.

Whenever an object of a class is created, the constructor of the associated class is invoked automatically.

A constructor can be overloaded i.e. there can be any number of constructors for a class. It is called as a constructor because it constructs the value of the data members of the class.

Different types of constructors are:

  • − Default Constructor: A constructor which never & doesn’t accept any parameters.
  • − Parameterized Constructor: A constructor that accepts Parameters.

  • For e.g.class Abc {int a,b;
    Abc(int i, int j) // parameterized constructor};

Whenever a Parameterized Constructor is declared for a class, then while declaring objects, the corresponding arguments should be mandatorily passed. We can either call the parameterized constructor explicitly or implicitly.

Eg. for calling a constructor explicitly: Abc a1= Abc(112); Here an object a1 of class Abc is created and the values 30 and 40 are passed .

to the object. Eg. for calling a constructor implicitly. Abc a1(30, 40);

Parameterized Constructor in C++ Example program

using namespace std;
class Rbc{ 
int a; 
public: Rbc(int x) { 
cout<<"Parameterized Constructor is called"<<endl; 
a = x; } 
void print(){ 
cout<<"The value of a is"<<a<<endl; 
} };
int main(){ 
Rbc r1(8);
return 0;

Output:-Parameterized Constructor is called
The value of a is :8

Explanation of the program:-

In this program, the parameterized constructor is invoked when the object r1 of class Rbc is created. The value passed is assigned to the class data member.

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