Discussion
How are the constants declared?
Answer: C
Correct answer: both const keyword and #define preprocessor
Both mechanisms are used, and they work quite differently. #define is a preprocessor directive performing textual substitution before compilation: the name has no type, no scope and no address, and the compiler never sees it.
const qualifies an actual object, which has a type, obeys the ordinary scoping rules, occupies storage and is visible to the debugger. const is generally preferred for that reason, though #define is still needed where a value must be a constant expression usable in contexts such as an array bound in older C.
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