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Unlike variables, macro symbols cannot be assigned. Suppose you were to write the following:
#define MINIMUM_RETURN_RATE 2.5 ... MINIMUM_RETURN_RATE = 5.0;
Because the substitution for MINIMUM_RETURN_RATE would be done
before the main work of compiling would begin, the compiler would encounter
the following altered line, about which it would complain vigorously:
2.5 = 5.0;