Data abstraction provides two important advantages:
Class internals are protected from inadvertent user-level errors, which might corrupt the state of the object.
The class implementation may evolve over time in response to changing requirements or bug reports without requiring change in user-level code.
By defining data members only in the private section of the class, the class author is free to make changes in the data. If the implementation changes, only the class code needs to be examined to see what affect the change may have. If data are public, then any function that directly accesses the data members of the old representation might be broken.
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