Node:$INCR, Next:$INPUT_LINE, Previous:$IFELSE, Up:Built-in functions
$INCR
: Increment a macro$INCR(N)
redefines the numeric macro N to be one greater
than its previous value. (If N does not simplify to a number, an
error results.) In other words, in the language of C the effect is to
say N++
.
The two-argument form $INCR(N,m)
executes the equivalent of
N += m
.