$LANGUAGE_NUM
: Number of current language ¶‘$LANGUAGE_NUM’ expands to an integer that uniquely defines the current language, as follows:
Language $LANGUAGE_NUM
C 0
C++ 1
Fortran 2
Fortran-90 3
Ratfor 4
Ratfor-90 5
TeX 6
VERBATIM 7
This built-in is useful in conjunction with an $IFCASE
construction; see $IFCASE
: n-way conditional.