How to generate consecutive list numbering?

Question

I have a Java program that generates a text file with a word per each line in the file. I want to make the program automatically generate and write the number of each line in the file. This number can have different formats like :

1, 2, 3, ...

a, b, c, ..., z, aa, ab, ac,....

i, ii, iii, ...

Coding this is simple, except for generating those number formats. The first format(1, 2, 3, ...) is of course easy, but is there any java numbers library or logic that can generate consecutive Latin or Letters like the 2nd and 3rd ones i have mentioned above ?

Sometimes, if you want something done right, you just have to do it yourself. — Hot Licks, Dec 15 '11 at 12:48

score 3 · Answer 1 · edited May 23 '17 at 10:34

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To generate the second form you need to translate a decimal number (base 10) to a number with base 26. Each "digit" is a character from a to z. This can be done by a sequence of x % 26 and x /= 26 operations until you reach 0.

For Roman numbers check: How do you find a roman numeral equivalent of an integer.

edited May 23 '17 at 10:34

Community

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answered Dec 15 '11 at 12:50

Tomasz Nurkiewicz

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score 0 · Accepted Answer · answered Dec 15 '11 at 12:49

You can find on the internet some functions already written to get Excel based numbers of columns:

http://soyouwillfindit.blogspot.com/2009/04/there-is-that-kind-of-odd-number-system.html

About Roman numbers, here you have :

http://www.roseindia.net/java/java-tips/45examples/misc/roman/roman.shtml

score 0 · Answer 3 · edited Jul 30 '12 at 02:34

0

Each letter has a integer equivalent.

Using ASCII as an example

97 = 'a' in ASCII

char c = (char) 97; // is now 'a'

so staring with 97++ and casting to a char will give you the alphabet in order required

edited Jul 30 '12 at 02:34

nmc

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answered Dec 15 '11 at 13:32

Jason

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How to generate consecutive list numbering?

3 Answers3