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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
C0
C++1
Fortran2
Fortran-903
Ratfor4
Ratfor-905
TeX6
VERBATIM7

This built-in is useful in conjunction with an $IFCASE construction; see $IFCASE.