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Groups > comp.lang.java.programmer > #24508
| From | Arved Sandstrom <asandstrom2@eastlink.ca> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: About java program. |
| References | (8 earlier) <kpo1dr$cji$1@dont-email.me> <rK3wt.42579$f_1.22147@newsfe05.iad> <kpsfn7$k9k$1@dont-email.me> <oYOwt.19280$9m5.18160@newsfe26.iad> <kq0k30$ubf$1@dont-email.me> |
| Message-ID | <Gq8xt.62041$5i1.57182@newsfe15.iad> (permalink) |
| Organization | Public Usenet Newsgroup Access |
| Date | 2013-06-21 23:59 -0300 |
On 06/21/2013 01:16 AM, Martin Gregorie wrote:
> On Thu, 20 Jun 2013 23:33:56 -0300, Arved Sandstrom wrote:
>
>> It's a good discussion. I'm not personally convinced that verbosity adds
>> complexity, as a rule. There's really two types of complexity here:
>> maintainability complexity - as in, can Joe Blow 12 months later
>> understand the code best if it's compact versus unrolled, and formal
>> complexity, cyclomatic and otherwise.
>>
> I'm with you there.
>
>> I'll admit that verbosity does usually add maintainability complexity,
>>
> My attitude is that well-laid out code with well-thought out names and
> intelligently commented offers about the best chance of being more easily
> maintainable. I prefer blocks of well formatted and carefully written
> comments places ahead of what they describe to any other type.
>
>> if not the other kind. But not always. I've seen plenty of code that is
>> conceptually quite complex but very terse.
>>
> I've certainly see some memorable examples of badly documented and over-
> clever code in the past.
>
> One of my favourite examples of bad documentation was actually quite good
> code: it was just the commenting style that was naff. This was MC 6800
> assembler, and the house style was to add a comment alongside every
> instruction whether it needed it or not: the machine had INC and DEC
> instructions to and or subtract 1 from a register, but did it really add
> anything the write "BUMP THE B REGISTER" alongside every INC B
> instruction?
>
> As it happens, my worst ever example was also assembler: this time PLAN 3
> assembler for an ICL 1900. In this case it was a lineprinter page, i.e.
> about 60 instructions whose task was the work out the date of the last
> day of the current month so it could be printed on financial statements.
> it worked by doing arithmetic on the current date in "dd/mm/yy" format
> This page has two comments: the first said "Calculate the last day of the
> month" and the second said "Works until Feb 2100". The rest of the page
> contained a mess of register-to-register operations and relative
> branches. There wasn't a single label or variable name in the whole mess.
> I never met anybody who could follow it past its first dozen steps - and
> that includes me - and I used to be fairly good at programming in PLAN.
>
> The silly thing was that the date calculation was trivial on a 1900,
> which held dates internally as days since 31 Dec 1899 and provided a set
> of date manipulation subroutines. The obvious solution, given that
> library, and writing the routine in pseudo-Java in deference to this 'ere
> august forum, looks like this:
>
> public String lastDayOfMonth(String today)
> {
> int day = 1;
> int month = today.substring(3,2);
> int year = today.substring(6);
> if (month > 12)
> {
> year++;
> month = 1;
> }
>
> days = gdatebin(String.format("%02d/%02d/%02d",day, month, year));
> return gbindate(days - 1);
> }
>
> ... and wasn't much longer in assembler.
>
> gdatebin() converted a date string into binary days since 31/12/1899 and
> gbindate() did the reverse. I have no idea why the bloke thought his mess
> of assembler would fall over after Feb 2100: the 1900 held dates in a
> signed 24 bit number, so its Y2K moment isn't due until some time in
> 24866 AD.
>
> And, yes, I do know my algorithm worked correctly despite leap years and
> all: it ran for years as part of an accounting package and anybody could
> see exactly how it worked even though it was written in COBOL.
>
>
Ahhh, dates. :-) Just this last fall had to bypass front ends for a
mainstream financial system and get at the DB directly. No docs worth a
damn, not even a good data dictionary for the database, so I had to use
the front end programs to generate DB activity of the sort I wanted
while I ran a SQL Server profiler trace. I cleaned up the trace and
looked at the dates...what is this, I thought? Integer numbers in the
seven hundred thousands. It took a bit of sleuthing to find out that it
was rata die dates.
There is no clean way of doing rata die <-> java.util.Calendar
conversions. And that nasty little 0.5 day floating point adjustment is
a bugger. It's only now after 9 months of production that I have a warm
fuzzy about the thing being solid.
AHS
--
When a true genius appears, you can know him by this sign:
that all the dunces are in a confederacy against him.
-- Jonathan Swift
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