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'+N' |
Allow NULL Perform Value |
The '+N' parameter controls whether the PERFORM directive will generate an error when an empty/null string is passed to a PERFORM directive.
By default, this parameter is On, which indicates that a NULL string is accepted.
When Off, a NULL string would be considered an error. (Pre-Version 7.10 PxPlus functionality)
When the PERFORM directive encounters a NULL string (and '+N' is On), the directive does not generate an error and simply proceeds to the next directive. In other words, the PERFORM does nothing.
(The '+N' system parameter was added in PxPlus v7.10, build 9170.)
On
PERFORM Call Subprogram, Share Variables