language agnostic - Are digits represented in sequence in all text encodings?

Question

This question is language agnostic but is inspired by these c/c++ questions.

How to convert a single char into an int

Char to int conversion in C

Is it safe to assume that the characters for digits (0123456789) appear contigiously in all text encodings?

i.e. is it safe to assume that

'9'-'8' = 1
'9'-'7' = 2
...
'9'-'0' = 9

in all encodings?

I'm looking forward to a definitive answer to this one :)

Thanks,

Update: OK, let me limit all encodings to mean anything as old as ASCII and/or EBCDIC and afterwards. Sandscrit I'm not so worried about . . .

Answer 1

I don't know about all encodings, but at least in ASCII and <shudder> EBCDIC, the digits 0-9 all come consecutively and in increasing numeric order. Which means that all ASCII- and EBCDIC-based encodings should also have their digits in order. So for pretty much anything you'll encounter, barring Morse code or worse, I'm going to say yes.