C++ Interview Questions and Answers

 

What is a COPY CONSTRUCTOR and when is it called?

A copy constructor is a method that accepts an object of the same class and copies
it’s data members to the object on the left part of assignement:





class Point2D{



int x; int y;





public int color;



protected bool pinned;



public Point2D() : x(0) , y(0) {} //default (no argument) constructor



public Point2D( const Point2D & ) ;



};





Point2D::Point2D( const Point2D & p )



{



this->x = p.x;



this->y = p.y;



this->color = p.color;



this->pinned = p.pinned;



}





main(){



Point2D MyPoint;



MyPoint.color = 345;



Point2D AnotherPoint = Point2D( MyPoint ); // now AnotherPoint has color = 345

Posted by:Richards