Difference between revisions of "Interview Questions"

Revision as of 23:09, 16 February 2012

Some Translation

n! Multiplicative

Object-oriented programming

Encapsulation

restricting access to some of the object's components
bundling of data with the methods
public and private data and methods.
A benefit of encapsulation is that it can reduce system complexity, and thus increases robustness, reduce risk of conflict between components.

Polymorphism

In C++, that type of polymorphism is called overloading. If a class has inherited a parent class, it can redefine a method and thus each class has a method with the same name but different functionality.

Inheritance

Inheritance is a way to reuse code of existing objects, establish a subtype from an existing object.
Allow replace the implementation of an inherited method or data.

Public Private Protected

A member (either data member or member function) declared in a private section of a class can only be accessed by member functions and friends of that class
A member (either data member or member function) declared in a protected section of a class can only be accessed by member functions and friends of that class, and by member functions and friends of derived classes
A member (either data member or member function) declared in a public section of a class can be accessed by anyone

Private Inheritance

Private inheritance is like making a composition.
One advantage to using protected/private inheritance instead of composition is that the derived class has access to protected members in the parent class. However this is kind of a double-edged sword, as it becomes easier to misuse the class.

class Motherboard {};

// this makes a "has a" relationship
class Computer : private Motherboard
{
};

// this makes a similar "has a" relationship
//  this approach is aka "composition"
class Computer
{
private:
  Motherboard mobo;
};