BrianCHarlie

Currently I am building a "Advanced Caculator" for my work place it includes Base 10, Binary, Octal, Hexadecimal, and Base31 add, subtract, divide, and multiply.

I've figured out how to do all the other ones but I am stumped when it comes to my base 31. The instructions I have is that its a custom system that uses all numbers 0-9 and all consonant letters B through Z including Y. (Z = 30 Base 10)

I am un sure what values you to give the letters to compute them correctly..
If I go Z = 30, Y = 29 it ends up being
E = 9, D = 8, C = 7, B = 6

Is this correct or am I missing something?

passel

I am unfamiliar with Base31, but a quick search seems to indicate there might be at least two encodings.
The "normal" would be what I would expect, and that is just continuing from Base16 so the last digit would be "U".

Another, which uses Y and Z, but skips some characters like "I" (i), "L" (l), "O" which are easily confused with other digits, would use Y in place of 0, and Z in place of 1.
The last digit in that series would be "X", so Z would be equal to 1, and Y = 0, X = 30.
Full series (in lower case)
"yz23456789abcdefghjkmnpqrstuvwx"

I guess the question is what Base31 representation do you want?

BrianCHarlie

Thanks for the help..
I am not sure from what I read I would assume it uses 0-9 and then B to Z. The exact line in the instrunctions I have for making this part of my caculator is as follows: "Base31 is our companies numbering system that uses all numbers 0-9 and all consonant letters B to Z. (Z=30 base10)..

I assumed there was some way by that sentance to figure out their logic by it, but from my research on the internet my self and what you put I am still confused so I will try find out if anyone can give me some help on it. Thanks again for the help..

passel

Well that makes more sense to me.
I guess it is unique to your company, perhaps.
The point being, you have to remove 5 characters from your alphabet to get 31 total digits.
Your description says to use the consonants, so the five vowels are the letters not used.
(aeiou). I guess they wanted to be clear that Y is treated as a consonant, not a vowel, which is why you mentioned earlier including "Y".

I did overlook the attribute "consonant" the first read.

BrianCHarlie

Thank you so much! I read over it a bunch of times and missed the constants my self, because ever time i tried to work it out it'd be wrong you know due to the 5 vowels.