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const:
- operates at run time
- consumes memory (though this is not too important)
- can't use in compile-time constant expression
- uses consistent syntax
- can create pointers to
- does type checking
Enumeration Constants
Enumeration constant can be used to represent an integer constant expression that has a value representable as an int. Unlike const-qualified objects, enumeration constants do not require that storage is allocated for the value so it is not possible to take the address of an enumeration constant.
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Compliant Solution (sizeof)
A Frequently it is possible to obtain the desired readability by using a symbolic expression composed of existing symbols rather than by defining a new symbol. For example, a sizeof expression can work just as well as an enumeration constant (see EXP09-A. Use sizeof to determine the size of a type or variable).
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| Wiki Markup |
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Using the {{sizeof}} expression in this example reduces the total number of names declared in the program, which is almost alwaysgenerally a good idea \[[Saks 02|AA. C References#Saks 02]\]. The {{sizeof}} operator is almost always evaluated at compile time (except in the case of variable length arrays). |
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