what is the application of public protected & private keyword?

[arnie20]

what is the application of public protected & private keyword? why do we declare some data members of a class as private ?

[r035198x]

what is the application of public protected & private keyword? why do we declare some data members of a class as private ?

What do the books/tutorials say?

[weaknessforcats]

Look at it this way.

Assume you have a date of three ints. One for month, one for day, and one for year. Let's say they are called Month, Day and Year.

Now let's assume your date variables are used in thousands of places in many programs.

Now your boss wants to change the date to a string mmddyyyyhhmiss.nnnnnn to conform to the CIM standard.

Now you have to install that strings in thousands of places instead of one place.

Does this make sense???

If it does, then you don't need C++.