System Functions

NUL( ) Test String for empty/null

Format	NUL(string[,ERR=stmtref])   Where: string String data to be tested if numm stmtref Program line number or label to which to transfer control.
Description	The NUL function will return a non-zero (TRUE) value if the string passed is has a length of zero or consists soley of space characters. It will return a zero (FALSE) value if the string contains anything other than spaces.