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