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__STDC_VERSION__ |
This macro expands to the C Standard's version number, a long integer
constant of the form yyyymmL
where yyyy and
mm are the year and month of the Standard version. This signifies
which version of the C Standard the compiler conforms to.
The value 199409L
signifies the 1989 C standard as amended in
1994, which is the current default; the value 199901L
signifies
the 1999 revision of the C standard. Support for the 1999 revision is
not yet complete.
This macro is not defined if the '-traditional-cpp' option is used.