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Ingy döt Net 2026-02-01 16:33:20 -08:00
parent 5150844a7d
commit 4bb20c9b71
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43
Task/Null-object/COBOL/null-object.cobol
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identification division.
program-id. null-objects.
remarks. test with cobc -x -j null-objects.cob
data division.
working-storage section.
01 thing-not-thing usage pointer.
*> call a subprogram
*> with one null pointer
*> an omitted parameter
*> and expect void return (callee returning omitted)
*> and do not touch default return-code (returning nothing)
procedure division.
call "test-null" using thing-not-thing omitted returning nothing
goback.
end program null-objects.
*> Test for pointer to null (still a real thing that takes space)
*> and an omitted parameter, (call frame has placeholder)
*> and finally, return void, (omitted)
identification division.
program-id. test-null.
data division.
linkage section.
01 thing-one usage pointer.
01 thing-two pic x.
procedure division using
thing-one
optional thing-two
returning omitted.
if thing-one equal null then
display "thing-one pointer to null" upon syserr
end-if
if thing-two omitted then
display "no thing-two was passed" upon syserr
end-if
goback.
end program test-null.