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Re: converting letters to numbers

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On 08/10/13 15:28, kjakupak@gmail.com wrote:
> I have to define a function add(c1, c2), where c1 and c2 are capital letters; the return value should be the sum (obtained by converting the letters to numbers, adding mod 26, then converting back to a capital letter).
>
Can you give some expected outputs? For example, add('A', 'B') should 
presumably return 'C', and add('M', 'B') should presumably return 'O', 
but what about add('A', 'A') or add('Z', 'Z')?

It feels like the only tricky bit is mapping letters to numbers (i.e. 
does A equal 1 or 0?), which you'd do by subtracting a fixed value from 
the result of chr. Once you've done that, you'd do the arithmetic to get 
a number between 1 and 26 (or 0 and 25), then add the same fixed value 
to that and call ord on the result.

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Thread

converting letters to numbers kjakupak@gmail.com - 2013-10-08 07:28 -0700
  Re: converting letters to numbers Robert Day <robertkday@gmail.com> - 2013-10-08 15:47 +0100
    Re: converting letters to numbers kjakupak@gmail.com - 2013-10-08 07:51 -0700
      Re: converting letters to numbers Joel Goldstick <joel.goldstick@gmail.com> - 2013-10-08 11:01 -0400
  Re: converting letters to numbers random832@fastmail.us - 2013-10-08 11:36 -0400
    Re: converting letters to numbers kjakupak@gmail.com - 2013-10-08 08:44 -0700
      Re: converting letters to numbers random832@fastmail.us - 2013-10-08 11:58 -0400
      Re: converting letters to numbers Tim Roberts <timr@probo.com> - 2013-10-13 20:13 -0700
        Re: converting letters to numbers Steven D'Aprano <steve@pearwood.info> - 2013-10-14 05:02 +0000
          Re: converting letters to numbers Charles Hixson <charleshixsn@earthlink.net> - 2013-10-16 12:18 -0700
            Re: converting letters to numbers Piet van Oostrum <piet@vanoostrum.org> - 2013-10-16 16:25 -0400
          Re: converting letters to numbers Rotwang <sg552@hotmail.co.uk> - 2013-10-16 23:39 +0100
            Re: converting letters to numbers MRAB <python@mrabarnett.plus.com> - 2013-10-16 23:53 +0100
            Re: converting letters to numbers Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-10-17 01:21 +0100
          Re: converting letters to numbers Tim Roberts <timr@probo.com> - 2013-10-19 16:31 -0700
          Re: converting letters to numbers rusi <rustompmody@gmail.com> - 2013-10-20 01:33 -0700
  Re: converting letters to numbers Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-10-08 17:05 +0100
  Re: converting letters to numbers Dave Angel <davea@davea.name> - 2013-10-08 21:24 +0000

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