Copy Constructor in C++ with example

Copy Constructor is always used when the compiler has to create a temporary object of a class object. The Copy Constructor is used in

1.      When the initialization of an object by another object of the same class.

2.      Return of objects as a function value.

3.      When stating the objects as by value parameters of a function.

Example:

#include<iostream.h>

#include<conio.h>

Class employee

               {

               int id;

               char name[20];

               public:

               employee (int t)

                              {

                              id = t;

                              }

               employee (employee &t)

                              {

id=t.id;

                              strcpy (n, t.n);

                              }

void get();

void put();           

};

void employee :: get()

{

cout<<”Enter the employee name =”;

cin>>name;    

}

void employee :: put()

{

               cout<<” Employee Id = ”<<id;

               cout<<” Employee Name = ”<<name;

}

void main()

{

clrscr();

               employee emp(110);

               emp.get();

               emp.put();

em(111);

               em.get();

               em.put();

               getch();

}