CHECK

Controls the checking of selective input values when variable information is displayed or altered by overtyping.

BOUNDS

Controls array index specification processing.

ON: Array indices must be inside the declared range.
OFF: Array indices outside the declared range may be specified, allowing you to follow errant program results.

This option also affects scrolling behavior of the ARRAY command.

NEGATIVE

Determines whether negative values can be assigned to Unsigned Fixed variables.

ON: An error message is issued and the variable is not updated.
OFF: A warning message is issued and the variable is updated. Attempts are made to update both the storage and register portions of shadowed variables, but expressions derived from variables are not reevaluated.

SUBSTRING

Controls substring index specification processing for character string and bit string variables.

ON: Substring indices must be inside the declared range.
OFF: Substring indices outside the declared range (including negative values) may be specified, allowing you to follow errant program results.

ALL | *

Applies ON or OFF processing to BOUNDS, NEGATIVE, and SUBSTRING.

Return codes