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There is a better way to use character codes in switch statements, however.
You can change the values of the type-defining enumeration constants.
Previously, in Chapter 31, they were declared as follows, with
C++ assigning eng_code to 0, box_code to 1,
and so on:
enum {eng_code, box_code, tnk_code, cab_code};
Recall, however, that you can supply particular integers instead. Further recall that C++ views characters as an integer data type. Thus, you can declare the type-defining enumeration constants as follows:
enum {eng_code = 'E', box_code = 'B', tnk_code = 'T', cab_code = 'C'};