constructor in c++

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Constructor are the special functions which have the following properties :
1. They have the same name as the class name.
2 They do not have any return type, not even void.
3. No need to call them automatically, called once when object is being created.
4. Constructor may be default or parameterized as well.
5. Mainly used to initialize the objects.

A Constructor of a Class may be defined as below

#include<iostream>
using namespace std; 
Class A
{
  public:
   A()
   {
    cout<<"Default constructor called automatically when object is created";
   }
} ;

Complete program to show constructor and function calling.

#include<iostream>
using namespace std; 
class Student
{
   public:
   int rollNo;
   string name;
   Student(int r, string n)  // parameterized constructor
    {
     rollNo=r;
     name=n;
    }
   void display()
   {
    cout<<"name of the student is"<<name <<endl;
    cout<<"Roll No of the student is"<<rollNo;
   }
};
int main()
{
int r=0;
string n;
cout<<"enter the name of the student";
cin>>n;
cout<<"enter the roll no of the student";
cin>>r;
Student s1(r,n);
s1.display();
return 0;

Above program gives the following output

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C Programs

constructor in c++

A Constructor of a Class may be defined as below

Complete program to show constructor and function calling.

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