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Whenever you assign an enumeration variable, the right side of the
assignment expression should be an enumeration constant of the same type. The
following, for example, is appropriate, given that c is a
industry_code enumeration variable:
c = food;
Some compilers warn you if you assign any object other than an enumeration constant to an enumeration variable. Using one of these compilers, you will get a warning if you write the following assignment statement:
c = 0;