Interconversion between decimal and any other base-n number system

I have written some general functions to convert between decimal and any other base-n number system(n<=36 for now) and vice-ver开发者_运维知识库sa. Don't want to make things messy here so i have posted the code here.

Could anybody suggest any better way for this? May be more effective and Rubyish?

Thanks

There's already the to_s method on Numeric and the to_i method on String to convert back:

irb(main):013:0> 10.to_s(36)
=> "a"
irb(main):014:0> "a".to_i(36)
=> 10

Check out Rosetta Code: http://rosettacode.org/wiki/Non-decimal_radices/Convert#Ruby