C++ Programming - OOPS Concepts - Discussion

What is the difference between Containment and Composition?

Inheritance and composition are two different concepts:

Inheritance deals with classes and the composition deals with objects.

Composition means deriving a complex object from a simpler object.

Containment and composition are same.

Inheritance is the answer. Its the class inside another existing class.

Answer C is wrong.

Can anyone give clear explanation of difference between Inheritance and Composition with examples of both?

This answer should be abstraction.

In inheritance, we can use data members and member function the class which is inherited but in composition you can initialise the object of other class and with the help of that object you can access its members.

For example:

class a
{
public:
int x;
}

class b:public a
{
x=10;
}

// But in composition,

class a
{
public:
int x;
}

class b
{
a obj;
obj.x=10;
}

We can't access x directly in other class.

We have to create obj of that class but in inheritance we can do.

Composition means containment. Where one object may contain attributes of other object.

Inheritance can be know by IS A relationship.

Composition is known by HAS A relationship (its basically a code reuse).

The question is very inaccurate, it should have been:.

"Of the defining object of one class as a member of another class?".

Compare this with "Of using object of one class inside another class?".

Actually "using" means to have access to an instance by any mean (even as a parameter) and call it's member functions. None of the options match this trivial functionality, but "None" was provided as an option.