# System Functions

NUL( ) | Test String for Empty/Null

## Format

NUL(string[,ERR=stmtref])
Where:

string | String data to be tested if null.
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 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.