The CLEAR statement takes no arguments.
The CLEAR statement clears (sets to 0) all local variables that are not assigned to a common storage area. Variables in a named common storage area or in the unnamed common storage area are unaffected.
Because CLEAR sets to 0 both assigned and unassigned variables, it can be usefully invoked at the beginning of a program to prevent problems caused by unassigned variables.
You can use the COMMON statement to assign variables to a common storage area. You can use the CLEAR COMMON statement to clear (reset to 0) all local variables that are assigned to a named common storage area or to the unnamed common storage area.