Write First C++ class

Oct 27, 2015Download as PPTX, PDF0 likes487 views

This document discusses the basics of creating a C++ class, including defining the class with public and private members, creating objects of the class type, and accessing class members both inside and outside the class. It explains that a class creates a user-defined data type and describes the general form of a C++ class with sections for private and public data and functions. It also covers defining member functions inside and outside the class and using the dot operator and scope resolution operator to access class members and functions.

At the end of this tutorial you will be able to
• Write correct syntax of a class.
• Create data members and member functions of a class.
• Create objects of a class.
• Access the class members outside the class.
• Explain the memory representation of an object.
• Define functions inside and outside the class.
www.learnbywatch.com | yogendra@learnbywatch.com

Why create a class?
• class creates a user defined data type.
www.learnbywatch.com | yogendra@learnbywatch.com

General form of c++ class
www.learnbywatch.com | yogendra@learnbywatch.com
class class-name {
private data and functions
public:
public data and functions
};

Object Creation
www.learnbywatch.com | yogendra@learnbywatch.com
class class-name {
private data and functions
public:
public data and functions
};
class-name object-name;
class-name object1, object2;

Access class members
• The dot operator ( . )
• Required only if you are accessing a class member outside class.
www.learnbywatch.com | yogendra@learnbywatch.com

$Define member function www.learnbywatch.com | yogendra@learnbywatch.com Inside class return_type function_name(parameters) { function body } Outside class return_type class_name::function_name(parameters) { function body } Scope resolution operator$

Ask your questions
to learn better
Yogendra Pal
www.learnbywatch.com | yogendra@learnbywatch.com

Classes in C++ allow developers to combine data and functions that operate on that data into logical units called objects. A class defines the form and behavior of objects, while objects are individual instances of a class. Some key points: - Classes contain data fields called data members and functions called member functions. - Objects are instantiated from classes and allocate memory to store values for an instance. - Access specifiers like public, private, and protected determine which parts of a class are accessible from outside the class. - Classes can contain static members that are shared across all objects of the class rather than being unique to each object.

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Classes extend the built-in capabilities of C++ able you in representing and solving complex, real-world problems. A class is an organization of data and functions which operate on them. Data structures are called data members and the functions are called member functions, the combination of data members and member functions constitute a data object or simply an object. Class is a group of data member and member functions. Another word class is a collection of objects of similar type. To create a class, use the class keyword followed by a name for the object. Like any other declared variable, the class declaration ends with a semi-colon. The name of a class follows the rules we have applied for variable and function names.

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Write First C++ class

1. First C++ Class Yogendra Pal

2. At the end of this tutorial you will be able to • Write correct syntax of a class. • Create data members and member functions of a class. • Create objects of a class. • Access the class members outside the class. • Explain the memory representation of an object. • Define functions inside and outside the class. www.learnbywatch.com | [email protected]

3. Why create a class? • class creates a user defined data type. www.learnbywatch.com | [email protected]

4. General form of c++ class www.learnbywatch.com | [email protected] class class-name { private data and functions public: public data and functions };

5. Object Creation www.learnbywatch.com | [email protected] class class-name { private data and functions public: public data and functions }; class-name object-name; class-name object1, object2;

6. Access class members • The dot operator ( . ) • Required only if you are accessing a class member outside class. www.learnbywatch.com | [email protected]

7. Define member function www.learnbywatch.com | [email protected] Inside class return_type function_name(parameters) { function body } Outside class return_type class_name::function_name(parameters) { function body } Scope resolution operator

8. Ask your questions to learn better Yogendra Pal www.learnbywatch.com | [email protected]

Write First C++ class

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