Is the enum type signed or unsigned? Does the signedness of enums differ between: C/C99/ANSI C/C++/C++x/GNU C/ GNU C99?
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Is the enum type signed or unsigned? Does the signedness of enums differ between:
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Is the enum type signed or unsigned? Does the signedness of enums differ between: C/C99/ANSI C/C++/C++x/GNU C/ GNU C99?
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An enum is guaranteed to be represented by an integer, but the actual type (and its signedness) is implementation-dependent.
You can force an enumeration to be represented by a signed type by giving one of the enumerators a negative value:
In C++0x, the underlying type of an enumeration can be explicitly specified:
(C++0x also adds support for scoped enumerations)
For completeness, I’ll add that in The C Programming Language, 2nd ed., enumerators are specified as having type
int(p. 215). K&R is not the C standard, so that’s not normative for ISO C compilers, but it does predate the ISO C standard, so it’s at least interesting from a historical standpoint.