At the present time, there is little difference. Although many people might have wished otherwise, the C Standard says that enumerations may be freely intermixed with other integral types, without errors. (If such intermixing were disallowed without explicit casts, judicious use of enumerations could catch certain programming errors.)
Some advantages of enumerations are that the numeric values are automatically assigned, that a debugger may be able to display the symbolic values when enumeration variables are examined, and that they obey block scope.
(A compiler may also generate nonfatal warnings when enumerations and integers are indiscriminately mixed, since doing so can still be considered bad style even though it is not strictly illegal.)
A disadvantage is that the programmer has little control over those nonfatal warnings; some programmers also resent not having control over the sizes of enumeration variables.

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• Write a function that takes in a string parameter and checks to see whether or not it is an integer,
• Covert a string to upper case

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