First of all, we should understand what is the meaning of 'abstract&

what's the difference between abstract class and concreate
class? what's the meaning of standard template library(STL)?

Question Posted / zubeir

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Answer Posted / zubeir

First of all, we should understand what is the meaning
of 'abstract' in terms of software. It's the same meaning
as in English, that is, the entities (objects) which do not
exist in the real world are abstract entities. For example,
Dog, Cat, Bear, Deer are all animals that exist but animal
is also an entity which is just a concept and there is no
existance.

So we can define an abstract class for 'Animal'. We can
derive any number of real world animal classes from the
abstract class 'Animal' like Tiger, Lion, Donkey, etc.

Obviously, we can understand now why we cannot create
objects for abstract classes. The answer is we must not,
right?
Because the Animal class has no existance in real world. So
we cannot create a real world entity (nothing but an
object). That is the very reason this concept is followed.
The derived classes that we've seen above are concrete
classes since they are real world objects and have definite
properties and operations on them.

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