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If you like, you can provide values for particular enumeration constants by
including integers in the enumeration statement. In the following example,
the value of the additional hop_code constant is 5, and
because the value of each succeeding constant lacking an expressed value is
1 more than that of the previous constant, the value of ref_code is
6:
enum {eng_code, box_code, tnk_code, cab_code, hop_code = 5, ref_code};
Note the contrast with the following, alternative declaration,
for which the value assigned to hop_code is 4 and
the value assigned to ref_code is 5:
enum {eng_code, box_code, tnk_code, cab_code, hop_code, ref_code};