This program demonstrates the use of copy constructor. (C++)

This program demonstrates the use of copy constructor. (C++)

This is again a very important interview question. Understand the concept very well.

#include< iostream.h>

#include< conio.h>

class rect

{

int area;

float len,width;

public:

rect()

{

}

rect(float ll,float wd)

{

len=ll;

width=wd;

area=ll*wd;

}

rect operator =(rect &r)

{

cout< < endl< < "Assignment operator invoked";

> area=r.area;

len=r.len;

width=r.width;

return rect(len,width);

}

rect(rect &r)

{

cout< < endl< < "Copy constructor invoked";

> len=r.len;

width=r.width;

area=r.len*r.width;

}

void display()

{

cout< < endl< < < "Area= "< < area;

>cout< < endl< < endl< <" Length= "< < len;

> cout< < endl< < endl< < "Width= "< < width;

}

};

void main()

{

clrscr();

rect r1(4.5,10);

rect r2;

r2=r1;

rect r3=r1;

r1.display();

r2.display();

r3.display();

}

Related Posts by Categories