Quick Answer: Why Would You Declare A Class’S Member Variables Private?

Why would you declare a class’s member variables private in C++?

13.6 Why would you declare a class’s member variables private.

To prevent code outside the class from directly accessing the member variable.

that might adversely affect the state of the object..

Why do we declare variables as private?

Making a variable private “protects” its value when the code runs. At this level, we are not concerned with protecting it from other programmers changing the code itself. The point of so-called “data hiding” is to keep internal data hidden from other classes which use the class.

Under what circumstances should a member function be private?

The member function should be private when the function is needed for internal processing, but not useful to the program outside the class.

What is a private variable?

Private variables, are variables that are visible only to the class to which they belong. Protected variables, are variables that are visible only to the class to which they belong, and any subclasses.

What is the difference between private and protected members?

Private members are accessible within the same class in which they are declared. Protected members are accessible within the same class and within the derived/sub/child class. Private members can also be accessed through the friend function. Protected members cannot be accessed through the friend function.

How do you access a private member function of a class?

Private: 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.