Oct 20 2022

Question 1

What is the syntax of inheritance

Answer 1

class Derived : public Base{

}

Question 2

Derived class
-> 1 Default
-> 2 Single Input
Base
-> 3 Default
-> 4 Singe Input
You created object Base no input how are the constructors executed

Answer 2

1 then 2

Question 3

Derived class
-> 1 Default
-> 2 Single Input
Base
-> 3 Default
-> 4 Singe Input
You created object Base one input how are the constructors executed

Answer 3

1 and 3

Question 4

Derived(int x,int y):Base(x)
{
cout«“Param of Derived “«y«endl;
}

What is this constructor doing

Answer 4

Execute Base class on input constructor then run derived class constructor

Question 5

A class can be used in two ways , What are the ways

Answer 5

A class can be Derived (IsA)
or
Object of that class be used ( hasA)

Question 6

What type of members can a class have and what are they called collectively

Answer 6

Private
Public
Protected

Access Specifiers

Question 7

Difference between

Private
Public
Protected

Answer 7

-> In main function you can only access public members
-> In a derived function of a derived class you can access public and protected only
-> All Are accessible with in its own class

Question 8

What are the types of inheritance

Answer 8

simple
Hiearchial
MultiLevel Inheritance
Multiple Inheritance

Question 9

What is Multi-path Inheritance

Answer 9

Combination of Multiple Inheritance and Hierarchal

Question 10

What does Virtual key Word Do in multipath inheritance

Answer 10

Removes the ambiguity as to through which path the base base function is coming to the most derived class

Question 11

class child : ______ Parent

What are the ways of inheritance

Answer 11

Public , all the members keep the original access Modifier
Protected , all the members keep the original access Modifier except for public which becomes protected
Private , all the members private

Question 12

Generalization vs Specialization

Answer 12

Top-Down = Specialization ( Parent Class was Existing then we defined a base class)
Bottom-Up = Generalization ( Base class was existing then we defined a parent class) -> Purpose is to group to achieve polymorphism

Question 13

What is function overriding in terms of classes

Answer 13

• Redefining a function of base class in derived class
• Function overriding is used for achieving runtime polymorphism
• Prototype of a overrides function must be exactly same as base class function

Question 14

How do Virtual Functions work in derived class and base class

Answer 14

• Virtual functions are used for achieving polymorphism
• Base class can have virtual functions
• Virtual functions can be overrides in derived class
• Pure virtual functions must be overrides by derived class

Question 15

How do Virtual Functions work in derived class and base class

Answer 15

• Virtual functions are used for achieving polymorphism
• Base class can have virtual functions
• Virtual functions can be overrides in derived class
• Pure virtual functions must be overrides by derived class

Question 16

What is PolyMorphism

Answer 16

Same name different actions
* Runtime Polymorphism is achieved using function overriding
* Virtual functions are abstract functions of base class
* Derived class must override virtual function
* Base class pointer pointing to derived class object and a override function is called

Question 17

What is pure virtual function

Answer 17

virtual void start()=0;

Mandatory for child class to override ,

Question 18

What are types of base classes

Answer 18

Base class All Concrete -> Reusability
Base class All Concrete + Virtual -> Reusability + Polymorphism
Base class All Virtual -> Polymorphism (interface)

Question 19

What is Abstract class

Answer 19

• Class having pure virtual function is a abstract class
• Abstract class can have concrete also.
• Object of abstract class cannot be created
• Derived class can must override pure virtual function, otherwise it will also become a abstract
  class.
• Pointer of abstract class can be created
• Pointer of abstract class can hold object of derived class
• Abstract classes are used for achieving polymorphism

Question 20

What is friend function

Answer 20

It is a global function that can access the class variable but you need to declare the friend function within the class

Question 21

What is friend class

Answer 21

if a class has a hasA relation it can access the private variables