RETURNS 1 IF V REPRESENTS AN EXISTING LABEL, 0 OTHERWISE
ACTION
The function LABEL(V) returns 1 if V represents an existing LABEL, 0 otherwise.
V is a string.
SYNTAX:
Result=LABEL(V)
USE ERROR EXAMPLE
label here
if label("here")=1 then print "the label here exists"
here:
LABEL()
LABEL(V)
SEE ALSO
LABEL