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Find limit of recursion: Difference between revisions
demonstrating better handling of stack-overflow exception
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=={{header|COBOL}}==
{{works with|OpenCOBOL 1.1}}
<lang cobol>
01 install-address usage is procedure-pointer.
procedure division.▼
01 install-flag pic x comp-x value 0.
100-main.▼
01 status-code pic x(2) comp-5.
move 0 to depth-counter.▼
01 ind pic s9(9) comp-5.
display "Mung until no good.".▼
perform 200-mung.▼
display "No good.".▼
linkage section.
stop run.▼
01 err-msg pic x(325).
set install-address to entry "300-err".
call "CBL_ERROR_PROC" using install-flag
install-address
returning status-code.
if status-code not = 0
display "ERROR INSTALLING ERROR PROC"
end-if
stop run.
300-err.
entry "300-err" using err-msg.
perform varying ind from 1 by 1
until (err-msg(ind:1) = x"00") or (ind = length of err-msg)
continue
end-perform
display err-msg(1:ind).
*> room for a better-than-abrupt death here.
exit program.</lang>
▲ 200-mung.
▲ add 1 to depth-counter.
▲ display depth-counter.
▲ perform 200-mung.</lang>
▲Compiled with <pre>cobc -x -g mung.cbl</pre> gives, after a while,
<pre>...
249
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recurse.cob:50: libcob: Stack overflow, possible PERFORM depth exceeded</pre>
Without stack-checking turned on (achieved with -g in this case), it gives
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Attempt to reference unallocated memory (Signal SIGSEGV)
Abnormal termination - File contents may be incorrect</pre>
which suggests that -g influences the functionality of CBL_ERROR_PROC
Thanks to Brian Tiffin for his [http://www.opencobol.org/modules/newbb/viewtopic.php?viewmode=thread&topic_id=254&forum=1&post_id=1312#1312 demo code on opencobol.org's forum]
=={{header|C sharp|C#}}==
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