RETURNS 1 IF V$ REPRESENTS A DEFINED VARIABLE, 0 OTHERWISE
ACTION
The function VARIABLE(V) returns 1 if V$ represents a defined variable, 0 otherwise.
V is a string.
Remark: a variable is defined by DIM.
SYNTAX:
Result=VARIABLE(V)
USE ERROR EXAMPLE
dim va%
if variable("va%")=1 then print "the variable va% exists"
VARIABLE()
VARIABLE(V)
SEE ALSO
DIM