OOPS Advanced

OOPs – Const Dest
●
Constructor : Things to do when a new
object is created
●
Destructor : Things to do when object's life
ends.

OOPs – More Constructors :
ERRATA

Lets answer the TRICK Question

Lets do the TRICK Question
15 years back, before C++ came in,
Address(cool) = Address(coolness)
COMPILER OPTIMIZATION!

Lets answer the TRICK Question
●
While making a COPY of the parameter, the
Copyconstructor of the parameter should
be called!
●
Thus the compiler optimization was invalid.

OOPs – Interfaces
●
Class definition, no logic
●
Defines what functions and data (vars)
should be present in the Class that
IMPLEMENTS an interface.
●

OOPs – Abstract Class
●
Small extension of Interfaces
●
Instead of requiring subclass to implement
ALL virtual functions, it also defines some
function's body.

OOPs – Virtual keyword
OUTPUT for each?

OOPs – Friend Function
PS: Never encountered a good use for a friend function :/

OOPs – Static Var and Function
Output?

OOPs – Static Var and Function

OOPs – Shallow Copy
Output?

Inheritance advanced
●
Types of inheritance :
●
Public
●
Private
●
Protected

CLASS DIAGRAM
READUP : UML Elements

Q) Variables
●
What is the size of a NULL value in C++?

Q) Variables
●
What is the size of a NULL value in C++?
●
1 Byte

Q) Functions
●
Python uses which of the following?
●
Call by value
●
Call by reference
●
Both, interchangeably
●
None of the above

Q) Functions
●
Python uses which of the following?
●
Call by value
●
Call by reference
●
Both, interchangeably
●
None of the above : It uses Callbyobject

Q) C'tors and d'tors
OUTPUT?

Q) This pointer
What is the error here?

Q) What are the OOPs conepts
used here?

Q) Inheritance
WHAT VARIABLES ARE ACCESSIBLE
TO
Function foo() ?

Q) Inheritance
TO
Function foo() ?
a_v1, a_v2, b_v2, b_v3, c_v2, c_v3
TO
Object d?

Q) Inheritance
TO
Function foo() ?
a_v1, a_v2, b_v2, b_v3, c_v2, c_v3
TO
Object d?
a_v2, c_v3

Q) Interfaces and Abs Class
●
Can you instanciate an object of an Abstract
class?

●
class?
●
NO

●
Can a function be final and virtual at the
same time?

●
class?
●
NO
– Virtual functions HAVE to be overridden
– Final functions CANNOT be overridden

OOPS Advanced

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