5 replies to this topic

[restin84]

hey guys

I'm working on some homework for my C++ programming class and the program has to convert a number between 1 and 3999 into Roman numerals. I have to build a string but I'm not quite sure how to code it. I'm cool with figuring out all the computation and what not but I just need a couple hints I guess. I wrote down 57 and then "L" + "VII" in my notes but I totally forgot how to implement it. I'll be doing some browsing online and in my book but any help would be appreciated.

[KeilanS]

Well, you know you need to use the string library, right?

From there, you could probably just output the "L" and then the "VII" without a space between them to make a Roman Numeral.

If that isn't good, I haven't tried this myself, but I believe you can just "add" strings.

For example:
str1 = "L";
str2 = "VII";
str3 = str1+str2;

That should give you: str3 = LVII.

Edit: I just tested this, and the connecting strings with "+" does work.

[restin84]

cool thats defintately helpful. I got the skeleton of the program laid out nicely. I did include the string library as well. Haven't gotten to the string building thing yet but I'll let ya know how it works out

[WingedPanther]

You will also need to use modulo/integer division to capture individual digits.

myint/100 % 10 gives the 100's place
myint/10 % 10 gives the 10's place.

[KeilanS]

Wow winged, the way I've been doing that is so much more complicated.

For the hundreds I was doing things like ((int%1000)-10*(int%100) - (int%10))/100.

Thanks!

[WingedPanther]

Someday I might dig up my old base conversion program that used logs to determine the number of digits.