INTERVIEW QUESTIONS C++ OBJECT ORIENTED PROGRAMMING IN C++ DETAILS

Question: What is abstraction?

Answer: Abstraction is of the process of hiding unwanted details from the user.

Abstraction is of the process of hiding unwanted details from the user. Source: CoolInterview.com

Abstraction is the process of representing only the important features and hiding the background details and explanations from the user. Source: CoolInterview.com

Abstraction means that hiding class details from the user, but user can use the class data by using the access specifiers. Source: CoolInterview.com

1. Abstraction<br>1.1 The process of modeling only relevant features by hiding unnecessary details that are not relevant to the current purpose. <br>1.2 Abstraction can be viewed as of the act of identifying software artifacts to model the problem domain. The process of reducing an object to its essence so that only the necessary elements are represented. Abstraction defines an object in terms of its properties (attributes), behaviors (functionality), and interface (means of communicating with other objects).<br><br>① Examples of Abstraction<br>1 Abstraction - If you ever say, “Don’t bother me with the details”,then you are trying to abstract.<br>2 Functional Abstraction - functional abstraction refers to a function that can be used without taking into account how the function is implemented. In functional abstraction, details of the algorithms to accomplish the function are not visible to the consumer of the function. The consumer of the function need to only know the correct calling convention and have trust in the accuracy of the functional results. When you are writing a function X you can put calls to other auxiliary functions into this function X. You specify WHAT these auxiliary functions do, but you [temporarily] abstract away HOW they do it.<br>3 Data Abstraction - For example, one could define an abstract data type called lookup table which uniquely associates keys with values, and in which values may be retrieved by specifying their corresponding keys. Such a lookup table may be implemented in various ways: as a hash table, a binary search tree, or even a simple linear list. The consumer(client) of the data container is only concerned about correct behavior of the data container(provided by interfaces of the data type lookup table) and not many of the internal details(implementation is kept entirely private, and indeed can change, for example to incorporate efficiency improvements over time). The idea is that such changes are not supposed to have any impact on client code, since they involve no difference in the abstract behaviour(interfaces of the data type that is visible to client, who is only interested in correct behavior).<br>4 Process Abstraction - In process abstraction, details of the threads of execution are not visible to the consumer of the process. An example of process abstraction is the concurrency scheduler in a database system. A database system can handle many concurrent queries. These queries are executed in a particular order, some in parallel while some sequential, such that the resulting database can not be distinguished from a database where all the queries are done in a sequential fashion. A consumer of a query which represents one thread of execution is only concerned about the validity of the query and not the process used by the database scheduler to accomplish the query. <br> Source: CoolInterview.com

Abstration is the process same as Filteration. as like a car and Car Driver. All the Unusable enternal features of car is hide for car driver. but usable features are view him as a very attractive way. Source: CoolInterview.com

An abstaraction is a process which concentrates on the essential characteristics of an object that distinguishes it from the environment, relative to the prospective viewer. Source: CoolInterview.com

Abstraction is a process of hiding the unnecessary details from the user.<br>For eg: A person driving the car only knows that the accelerator is used to increase the speed of the car but dont know actually what the internal operation happened to increase the speed .<br> Source: CoolInterview.com

Representation of the essential feature with out including details is calledd abstraction. Source: CoolInterview.com

it refers to the act of representing the essential features without including the background details. Source: CoolInterview.com

Abstraction is 'hiding of unessential details' from the user. Source: CoolInterview.com

Abstraction means representing the essential features with out including the background details or explanations<br>Classes use the concept of data abstraction so they are known as Abstract Data types(ADT). Source: CoolInterview.com

In object-oriented programming language the programmer can abstract both data and code when needed. <br> But we can't have object of standalone abstract classes. Source: CoolInterview.com

abstraction is of the process of hiding unwanted details from the user. Source: CoolInterview.com

representation of essential features without background details called abstraction Source: CoolInterview.com

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