Copy Constructor in C++

constructor is used to copy the value of one object to another object. We used the copy constructor like     “counterrr(counterrr &ob)”. We can declare and initialize an object from another object like “counterrr c2(c1)”.We create two objects that means   counterrr   c1 and c2 .

#include<conio.h>

#include<iostream.h>

class counterrr

{

private:

int coun;

public:

counterrr(int x)     /*constructor with argument*/

{

coun=x;   //value assign to variable count

}

counterrr(counterrr &ob)   //copy constructor

{

coun=ob.coun;

}

void show()

{

cout<<count<<endl;

}

};

void main()

{

counterrr c1(10);   //c1 is the object and 10 is the value given to x variable.

counterrr c2(c1);   //copy constructor

c1.show();       /*function calling by c1 object */

c2.show();   /*function calling by c2 object

getch();

}

Explaination:

In this example we create the constructor(counterrr) with arguments.A reference variable(&ob) has been used as an argument to the copy constructor(counterrr &ob). We cannot pass the arguments by value to a copy constructor.