What's the difference between composition and inheritance in C++?

Question

By composition,I mean taking one object of a class as another class member

Answer 1

u know inheritance , child-parent and all that relation.
the concepr of composition should not be taught
its absurd.
its useless.
we have class such that
class student{
int a;
public:
.....
.....
...
};
WHAT we do in composition??
instead of int a we use teachr b.
thats it.
class is also a data type hence we can use it as other members.

Answer 2

These concepts are the same in all OOP languages but, ok, lets use C++:
Inheritance is a form of specialization i.e. the child (BMW) specializes the behaviour of the parent (Car) by inheriting its behaviour and specializing (or extending it). We typically say inheritance is a "is a" relationship i.e. BMW "is a" Car.
Composition is a form of ownership i.e. the class is made up ("composed") of some members that are instances of other classes i.e. a Shape class has a Color member. We typically say composition is a "has a" relationship i.e. a Shape "has a" colour.