4.4 enum and HLA Enumerated Data Types
In a previous section discussing constants and constant expressions, you saw the following example:
const TapeDAT := 0; const Tape8mm := TapeDAT + 1; const TapeQIC80 := Tape8mm + 1; const TapeTravan := TapeQIC80 + 1; const TapeDLT := TapeTravan + 1;
This example demonstrates how to use constant expressions to develop a set of constants that contain unique, consecutive values. There are, however, a couple of problems with this approach. First, it involves a lot of typing (and extra reading when reviewing this program). Second, it's very easy to make a mistake when creating long lists of unique constants and reuse or skip some values. The HLA enum
type provides a better way to create a list of constants with ...
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