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From: fir <fir@grunge.pl>
Newsgroups: comp.lang.c
Subject: Re: how to make it work
Date: Thu, 29 Aug 2024 20:24:57 +0200
Organization: i2pn2 (i2pn.org)
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References: <877194bd8a95b9acb03db317ee000e94cce2834d@i2pn2.org> <87cylrwkdf.fsf@bsb.me.uk> <be85fd1fb842b5dc7851d36d535869973cc325cf@i2pn2.org> <vaqdte$2arg$1@dont-email.me>
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James Kuyper wrote:
> fir <fir@grunge.pl> writes:
> ...
>>> fir <fir@grunge.pl> writes:
>>>
>>>> see such code
>>>>
>>>>
>>>> long long unsigned tag ;
>>>>
>>>> void foo(long long unsigned tag)
>>>> {
>>>>    if(tag=='warsaw') printf("\nwarsaw");
>>>>    if(tag=='paris')  printf("\nparis");
>>>>    if(tag=='new york') printf("\nnew york");
>>>>    if(tag=='old york') printf("\nold york");
>>>>    if(tag=='very old york') printf("\nvery old york");
> ...
>> - my example work on up to 4 lellets/digits/signs
>> but i dont know how to make it work for 8
>
> "An integer character constant has type int. ... The
> value of an integer character constant containing more than one
> character, ... is implementation-defined."
>
> The implementation you're using apparently defines a different value for
> each possible combination of 4 characters, which is the maximum number
> allowed if sizeof(int)==4. Keep in mind that, since the mapping is
> implementation-defined, such code is non-portable. For instance, it's
> entirely possible that an implementation sets the value of a
> multi-character constant solely by looking at it's first or last
> characters. On some implementation, you might have 'new york' == 'k' and
> 'old york' == 'k'.
>
>> as even old c has 64 bit unsigned i guess it should work, but dont know how
>> to make it work
>
> So, by "old c" you mean C99? Before C99, no integer type was guaranteed
> to have more than 32 bits.
>
very bad but at least clear

hovever as c standard rules/statements or how to call it are
dome to make c have sense then this rule should be changed
to this

An integer character constant mau have any integer type from simple types
avalieble (it is char, short, int long etc) - the value for it is like
adequate string ofd such walue would have in ram say 'lalalala" would heve
walule of 0x6c616c616c616c61