Private Methods Definition And Declaration C

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Difficulty Level : Basic
Last Updated : 15 Oct, 2019
All the class members declared under public will be available to everyone. The data members and member functions declared public can be accessed by other classes too. The public members of a class can be accessed from anywhere in the program using the direct member access operator (.) with the object of that class.
// C++ program to demonstrate public
        return 3.14 * radius * radius;
    // accessing public data member outside class
    cout << "Radius is: " << obj.radius << "\n";
    cout << "Area is: " << obj.compute_area();
Output:
Radius is: 5.5
Area is: 94.985

In the above program, the data member radius is public so we are allowed to access it outside the class.
The class members declared as private can be accessed only by the functions inside the class. They are not allowed to be accessed directly by any object or function outside the class. Only the member functions or the friend functions are allowed to access the private data members of a class.
Example:
// C++ program to demonstrate private
        // member function can access private
        double area = 3.14 * radius * radius;
        cout << "Radius is: " << radius << endl;
        cout << "Area is: " << area;
    // creating object of the class
    // trying to access private data member
Output:
Radius is: 1.5
Area is: 7.065

Difference between Public and Private
All the class members declared under public will be available to everyone.
The class members declared as private can be accessed only by the functions inside the class.
The data members and member functions declared public can be accessed by other classes too.
Only the member functions or the friend functions are allowed to access the private data members of a class.
The public members of a class can be accessed from anywhere in the program using the direct member access operator (.) with the object of that class.
They are not allowed to be accessed directly by any object or function outside the class.
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The private keyword is a member access modifier.
This page covers private access. The private keyword is also part of the private protected access modifier.
Private access is the least permissive access level. Private members are accessible only within the body of the class or the struct in which they are declared, as in this example:
Nested types in the same body can also access those private members.
It is a compile-time error to reference a private member outside the class or the struct in which it is declared.
For a comparison of private with the other access modifiers, see Accessibility Levels and Access Modifiers.
In this example, the Employee class contains two private data members, name and salary. As private members, they cannot be accessed except by member methods. Public methods named GetName and Salary are added to allow controlled access to the private members. The name member is accessed by way of a public method, and the salary member is accessed by way of a public read-only property. (See Properties for more information.)
For more information, see Declared accessibility in the C# Language Specification. The language specification is the definitive source for C# syntax and usage.
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