| Remember |
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| • | Data
abstraction is a technique for |
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| controlling
the interaction between a |
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| program
and its data structures and the |
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| operations
performed on this data. |
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| • | It
builds "walls" around a program's data |
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| structures.
Such walls make programs |
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| easier
to design, implement, read, and |
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| modify. |
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