Re: C++ way to convert ASCII digits to Integer?
On May 31, 4:22 pm, "osmium" <r124c4u...@comcast.net> wrote:
James Kanze wrote:
On May 29, 3:08 pm, Gerhard Fiedler <geli...@gmail.com> wrote:
James Kanze wrote:
(Given that ASCII is for all intents and purposes dead, it's
highly unlikely that they really want ASCII.)
I'm not sure, but I think in the USA there is quite a number
of programmers who don't think beyond ASCII when thinking of
text manipulation.
In just about every country, there are quite a number of
programmers who don't think:-). The fact remains that the
default encoding used by the system, even when configured for
the US, is not ASCII. Even if you're not "thinking" beyond
ASCII, your program must be capable of reading non-ASCII
characters (if only to recognize them and signal the error).
Is it your point that an ASCII compliant environment would
have to signal an error if the topmost bit in a byte was
something other than 0?
My point is that the actual bytes you'll be reading may contain
non-ASCII characters, whether you like it or not, and that your
program has to handle them in order to be correct. (Of course,
lots of programs limit their input. None of my programs which
deal with text, for example, allow control characters like STX
or DC1; such a character in the input will trigger an error. As
will an illegal UTF-8 sequence, if the program is inputting
UTF-8.)
Or do you have something else in mind? I don't have the
*actual* ASCII standard available but I would be surprised if
that was expressed as a *requirement*. After all, the people
that wrote the standard were well aware that there was no such
thing as a seven-bit machine.
ASCII defined code points in the range 0-127. Any other value
is not ASCII. (And the usual arrangement on a PDP-10 was 5
seven bit bytes in a 36 bit word, with one bit left over.)
--
James Kanze (GABI Software) email:james.kanze@gmail.com
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