Data members and member functions
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This document discusses data members and member functions in C++ classes. It defines data members as variables declared inside a class that can be of any type. Member functions are functions declared inside a class that can access and perform operations on the class's data members. The document outlines how data members and member functions can be defined with public, private, or protected visibility and how they can be accessed from within and outside the class. It also provides syntax examples for defining member functions both inside and outside the class definition.
![Accessing Data Members
(outside the class)
• Syntax: (single object)
obj_name . datamember;
ex: st.st_id;
• Syntax:(array of objects)
obj_name[i] . datamember;
ex: st[i].st_id;](https://image.slidesharecdn.com/detamembersandmemberfunctions-160424085524/85/Data-members-and-member-functions-6-320.jpg)
Data members and member functions
- 1. Data Member and Member Function MADE BY: HARSH PATEL :140950107057 DRASHTI PATEL :140950107056 CSE-B
- 2. Class Specification • Syntax: class class_name { }; Data members Members functions
- 3. Class Specification • Visibility of Data members & Member functions public - accessed by member functions and all other non-member functions in the program. private - accessed by only member functions of the class. protected - similar to private, but accessed by all the member functions of immediate derived class default - all items defined in the class are private.
- 4. Data Members • The variables declared inside the class are known as data members. • The private data of a class can be accessed only through the member functions of that class. • Data members Can be of any type, built-in or user-defined
- 5. Accessing Data Members (inside the class) • Syntax: (single object) data_member; ex: st_id; • Syntax:(array of objects) data_member; ex: st_id;
- 6. Accessing Data Members (outside the class) • Syntax: (single object) obj_name . datamember; ex: st.st_id; • Syntax:(array of objects) obj_name[i] . datamember; ex: st[i].st_id;
- 7. Member Function • The functions declared inside the class are known as member functions. • Member functions access the values of the data members and perform operations on the data members . • Their definition can be placed inside the class body, or outside the class body. • Can access both public and private members of the class
- 8. Defining Member Functions • Member functions can be defined in two places: – Inside the class definition. – Outside the class definition.
- 9. Defining Member Functions • Inside the Class Definition – Replace the function declaration with the definition of the function inside the class. – When a function is defined inside a class, it is treated as an inline function. – All the restrictions and limitations that apply to an inline function are also applicable to the functions defined inside a class.
- 10. Defining Member Functions • Syntax :(Inside the class definition) ret_type fun_name(formal parameters) { function body; }
- 11. Defining Member Functions • Outside the Class Definition – Member functions that are declared inside a class have to be defined separately outside the class. – Their definitions are very much like the normal functions. – They should have a function header and a function body. – An important difference between a member function and a normal function is that a member function incorporates a membership “identity label” in the header. … This label tells the compiler which class the function belongs to.
- 12. Defining Member Functions • Syntax:(Outside the class definition) ret_type class_name::fun_name(formal parameters) { function body; } (scope resolution operator)