Interface tutorial's example

[puneet9983]

In the first (and further) example of interface's tutorial..this is used
" CRectangle rect;
CTriangle trgl;

CPolygon * ppoly1 = ▭
CPolygon * ppoly2 = &trgl;

ppoly1->set_values (4,5);
ppoly2->set_values (4,5);
"

I can use this also-
" rect.set_values (4,5);
trgl.set_values (4,5);
"

WHY SHOULD I USE THE EARLIER ONE???? WHY IS IT SPECIAL??? WHAT ARE THE SPECIAL FETURES??

[Moschops]

WHY SHOULD I USE THE EARLIER ONE????

BECAUSE SOMETIMES YOU HAVE A POINTER TO AN OBJECT RATHER THAN THE OBJECT ITSELF, FOR EXAMPLE IF YOU CREATE AN OBJECT USING NEW.

[puneet9983]

okay.
any why making pointer of base class'es type more important that of derived class'es type..?

[Moschops]

It's not more important. They're both useful in the right place.

[puneet9983]

okay..concept is clear now. Thanks a lot !