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7.2.3.34 $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.