defining a struct to associate roman numerals value 1

[chineerat]

hello there, i am wondering if there is an easier way to do this.
basically i am creating a vector of type structure and structure has types integer and string.

bascially the structure will have the roman numeral and its associated decimal value eg.

int string
1 I
5 V
10 X

etc.
and of course the first element of the vector will be integer 1 and string I
the second element will integer 5 and string V
and etc.

Am I doing something that already has been done or is this the only way to this?

thanks in adavnace

 

[cpjust]

You can use a map:

http://msdn2.microsoft.com/en-us/library/s44w4h2s(VS.80).aspx

 

[xwb]

Is it just a lookup or do you want to convert integers to Roman Numerals at the end of the day.

 

[chineerat]

yes!
i'll like to convert integers to Roman Numerals. why? am i approaching it wrongly if i do it like this?

 

[xwb]

There are many ways of skinning a cat: there is no wrong way and no right way. Algorithm development is a learning process. Sometimes we need to reinvent the wheel just for the satisfaction of thinking that we would have been able to do it even if nobody had told us how. Sometimes, the methods we invent are simpler than anything published.

Alternatively, if you want a simple algorithm, there is one in

http://uk.geocities.com/xieweibao@btinternet.com/coderome.htm

but it is in VBScript. It is simpler than all the ones I've seen so far. I first devised the algorithm in VbScript so that is the one on the site. It is quite easy translating it to other languages. I've used it in BCPL, JavaScript, Fortran, Perl, Java, Assembler to name a few.

Shouldn't be too difficult translating it. The range is 1 to 3999. There is a problem printing Roman numerals bigger than 3999. For one, even the Romans are totally inconsistent on this. If you use the overscore notation, the problem is getting it to display correctly since there is no equivalent ANSI/UTF-8/UTF-16/Unicode character.

 

[xwb]

There is one in C++ in

http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=4571&lngWId=3

Similar idea but using arrays instead of structures. Subindex 0 is the ones, 1 is the fives and 2 is the tens.

 

[chineerat]

aye thanks guys!!
while you're at it, can you redirect me to a roman to arabic conversion?
thanks alot!!

 

[xwb]

Tons of them around. Try

http://www.crowes-nest.com/CrowesNest/Library/RomanConv/roman.html

Just click on View/Source to see the source: it is all in Javascript but easily translatable to C++ and you could pick up Javascript on the way.