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defensive des (IDE (error diagnostics, Editor, live preview, translators),…
defensive des
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Data validation
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Validation cannot ensure that the user has not entered the wrong value, or made a spelling mistake in a name
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Password routines
commonly, you are asked to enter a user ID and a password
Once you have entered the User ID, the program looks up your password on a store file
If the user ID cannot be found, an error message is displayed
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