[SOLVED] Roman Numeral Conversion

brianL · 10-29-2013, 11:05 AM

Quote:

Originally Posted by Didier Spaier

I didn't vote for him.

tronayne · 10-29-2013, 11:57 AM

... founded Londinium, built some nice roads, built the baths at Bath, brought civilization, learning, language (well, thankfully, that didn't stick, English is Germanic), clean water, sewers (there's one at York that is still draining the Minster).

The good, the bad and ugly, too.

neymac · 10-29-2013, 01:18 PM

Quote:

Originally Posted by volkerdi

Oh, you need something to go along with this to do Arabic to Roman conversion? Here's a handy little program for that:
....
Save it as roman.cob and compile it with: cobc -x roman.cob

Enjoy!

I tested it with 487-> THE CORRESPONDING ROMAN NUMBER IS CCCCLXXXVII as result instead of CDLXXXVII (the right result), ENTER ANY NUMBER: 99
THE CORRESPONDING ROMAN NUMBER IS LXXXXVIIII (should be XCIX),
ENTER ANY NUMBER: 9
THE CORRESPONDING ROMAN NUMBER IS VIIII (should be IX, but maybe I did some mistake, who knows?)

But I think this was not the main cause of the fall of the Roman Empire...

tronayne · 10-29-2013, 01:53 PM

Quote:

Originally Posted by neymac

I tested it with 487-> THE CORRESPONDING ROMAN NUMBER IS CCCCLXXXVII as result instead of CDLXXXVII (the right result), ENTER ANY NUMBER: 99
THE CORRESPONDING ROMAN NUMBER IS LXXXXVIIII (should be XCIX),
ENTER ANY NUMBER: 9
THE CORRESPONDING ROMAN NUMBER IS VIIII (should be IX, but maybe I did some mistake, who knows?)

But I think this was not the main cause of the fall of the Roman Empire...

Yup, same results with two separate converters. Maybe that's why nobody uses COBOL anymore -- maybe something to do with the year 2000 problem, eh?

However, the "wrong" conversions are actually correct, they're just too danged long (they convert to the correct integers properly).

Only the Shadow knows...

GazL · 10-29-2013, 03:46 PM

I had a go as well.

This one uses the subtractive-notation rules as described on wikipedia.

I've attached one that converts both ways.

qweasd · 10-29-2013, 07:58 PM

Code:

function r2a () {
    echo $(( $(echo "$1" | \
	sed -e 's/iv/\+4/gI' -e 's/ix/\+9/gI' \
	-e 's/xl/\+40/gI' -e 's/xc/\+90/gI' \
	-e 's/cd/\+400/gI' -e 's/cm/\+900/gI' \
	-e 's/i/\+1/gI' \
	-e 's/v/\+5/gI' \
	-e 's/x/\+10/gI' \
	-e 's/l/\+50/gI' \
	-e 's/c/\+100/gI' \
	-e 's/d/\+500/gI' \
	-e 's/m/\+1000/gI')))
}

perbh · 10-29-2013, 09:59 PM

Quote:

Originally Posted by saulgoode

When I was in school, those columns were used for sequence numbering of the cards. If you happened to drop your stack of cards then you could run them through a sorting machine that would arrange them based on the numbers in those columns. The keypunch would automatically add the sequence numbers as you created your code, or you could generate new sequence numbers when you made a copy of your card deck.

*chuckles* I had a collegue once who had a box of cards (3000 of'em) which were to be run through a card-punch to add sequence numbers. The cards contained numeric data. He stumbled over the threshhold and lost the box with the content spewing out - took him a week or so to get them all back in proper order!!

neymac · 10-29-2013, 10:00 PM

Quote:

Originally Posted by GazL

I had a go as well.

This one uses the subtractive-notation rules as described on wikipedia.

I've attached one that converts both ways.

Well done!

perbh · 10-29-2013, 10:03 PM

Another collegue was going to a shipyard in Canada with a huge bunch of cards containing data for a vessel-build (numeric description of all the different steel-plates making up a vessel). He was stopped in custom and asked what he was bringing into the country. The custom officer picked up some cards and looked at them, then said: "Oh - they are all used! - please proceed"

irgunII · 10-30-2013, 06:51 AM

Quote:

Originally Posted by brianL

I didn't vote for him.

I think they missed what you're refering to. I caught it instantly and got a nice chuckle out of it and sure enough even started to try and remember all the things they went through in the movie(s), heh heh.

"I mean....if I went 'round sayin' I was an emperor just because some moistened
bint lobbed a scimitar at me, they'd put me away!" -Dennis from Monty Python and
the Holy Grail

gnashley · 10-30-2013, 09:15 AM

"maybe something to do with the year 2000 problem, eh?" Actually, I think it was Y1K problem...

tronayne · 10-30-2013, 10:12 AM

And Admiral Hopper is possibly spinning in her tomb at the mere mention, eh?

szboardstretcher · 10-30-2013, 10:24 AM

Quote:

Originally Posted by Didier Spaier

What's funny about your question is that word algorithm is derived from that of Persian mathematician عَبْدَالله مُحَمَّد بِن مُوسَى اَلْخْوَارِزْمِي‎ (in English Al-Khawarizmi), who introduced in Middle East then in Europe the so-called arabic numerals.

Also, word algebra is taken from part of the Arabic title of his best known book.

PS Now I'm sure NSA is watching me

Very interesting.

I'd like to mention that the numerals that we use today are not Arabic, although that is what everyone mistakenly believes. They are Hindu numerals. An Indian mathemetician invented it 800 years before the Arabs are claimed to have.

The more you know.

hpfeil · 10-30-2013, 10:29 AM

I had to do that as a homework problem decades ago. Forgot what I did, though, it was in VAX MACRO assembler. Thanks for the reminder!

qweasd · 10-30-2013, 10:55 AM

Quote:

Now I'm sure NSA is watching me

How do you know NSA is watching you? Your modem light is blinking.