The document discusses constructors in C++. A constructor is a special method that is called when an object of a class is created. The constructor has the same name as the class and is used to initialize the object. It can be called without creating an object of the class. The code shows a constructor defined for the class mudsir that prints a message when an object of that class is created in the main function.

1. //Using of Constructor
//Use the same name of function as to class is called constructor
//Note: That constructor are use without creating object
#include<iostream>
using namespace std;
class mudsir{
public:
mudsir(){
cout<<"nnnnThis program is made by Engr Mudasir hussainn";
}
};
main()
{
mudsir nasir;
}