converting from roman numerals to standard numbers

[Guest_imported]

Hello.

For my C++ programming class, I need to be able to write a program that will read Roman numerals. Like if 'XXII' is input, the program will read that as 22. Any ideas? Thanks

 

[brudnakm]

12rs,

We do not solve homework problems in this forum. That being said, the best approach is probably to do some conversons by hand. Then force your program to step through the same decision process, but for the general case.

Brudnakm

 

[tmoody]

Isn't this as simple as parsing a table, then adding all the numbers?? If someone enters MMDXI you would add 1000, 1000, 500, 10 and 1, for 2511?? Maybe it's more complicated than that, but hey, it's your class!!

I 1
V 5
X 10
L 50
C 100
D 500
M 1000

Tim

 

[iggystar]

The big problem hear is we dont know how much you know about C. It's not really a hard problem. Just read the roman numeral into an array, (or a dynamically allocated string if you know how) and just move through it one piece at a time and add or subtract as appropriate.

You could use a big switch statement to do all the work, or you could come up with a hash. There's really a lot of ways to do it.

Tell me, do you have to convert just a few particular ones or do you have to interact with an end user, or are you reading from a file?