By eliminating "magic" numbers from the body of the code and placing them in header files, the code becomes easier to maintain. Symbolic names should be self documenting.

Literals with intuitive meaning: the character literal '\0', numeric literals 0 & 1 and the boolean literals true and false.

String literals that only occur in the code once. This exception does not apply where there is a requirement for internationalisation.

Industrial Strength C++ 5.4;