$PP
: The C preprocessor symbol
$PP
is shorthand for $UNSTRING($P)
(see $P), or
(essentially) a synonym for $UNSTRING("#")
(see $UNSTRING).
It is useful, particularly in FORTRAN, for constructing FWEB
macro definitions that expand to C preprocessor statements. For an
example, see $P. For a detailed discussion of the difference
between $P
and $PP
, see Strings and quotes.