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Although there is nothing wrong with defining macros, many experienced C programmers would be more likely to use an enumeration declaration, as in the following example:
enum {food, trucking, computers, metals, health, airline};
Such a declaration identifies all the symbols in braces as enumeration
constants, and assigns integer values to those constants. By default, the
value of the first enumeration constant is 0; also by default, the
value of each succeeding enumeration constant is 1 more than the previous
value. Hence, the value of food is 0 and the value of
trucking is 1.