C++ programming Objective Questions on OOPS Concepts

Hello Friends,
Object-oriented programming (OOP) is a programming paradigm that represents concepts as "objects" that have data fields (attributes that describe the object) and associated procedures known as methods. Objects, which are instances of classes, are used to interact with one another to design applications and computer programs.


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C++ programming Objective Questions on Functions

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A function is a group of statements that together perform a task. Every C++ program has at least one function which is main(), and all the most trivial programs can define additional functions.

The C++ standard library provides numerous built-in functions that your program can call. For example, function strcat() to concatenate two strings.

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C++ programming Objective Questions on References

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In the C++ programming language, a reference is a simple reference datatype that is less powerful but safer than the pointer type inherited from C. The name C++ reference may cause confusion, as in computer science a reference is a general concept datatype, with pointers and C++ references being specific reference datatype implementations.

ex:

int A = 5;
int& rA = A;

extern int& rB;

int& foo (); 

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C++ programming Objective Questions on Constructors and Destructors

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Classes have complicated internal structures, including data and functions, object initialization and cleanup for classes is much more complicated than it is for simple data structures. Constructors and destructors are special member functions of classes that are used to construct and destroy class objects. Construction may involve memory allocation and initialization for objects. Destruction may involve cleanup and deallocation of memory for objects.

• Constructors and destructors do not have return types nor can they return values.
• References and pointers cannot be used on constructors and destructors because their addresses cannot be taken.
• Constructors cannot be declared with the keyword virtual.
• Constructors and destructors cannot be declared static, const, or volatile.
• Unions cannot contain class objects that have constructors or destructors.

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C++ programming Objective questions 0n Objects and Classes

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In object-oriented programming languages like C++, the data and functions (procedures to manipulate the data) are bundled together as a self-contained unit called an object. A class is an extended concept similar to that of structure in C programming language, this class describes the data properties alone. In C++ programming language, class describes both the properties (data) and behaviors (functions) of objects. Classes are not objects, but they are used to instantiate objects.

ex:

class Cards

{

   data;

   member_functions;

   ...........

};

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