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devel / comp.lang.c / what is the value of 'ç' in C?

SubjectAuthor
* what is the value of 'ç' in C?Thiago Adams
+- Re: what is the value of 'ç' in C?Öö Tiib
+- Re: what is the value of 'ç' in C?Ben Bacarisse
`- Re: what is the value of 'ç' in C?Michael S

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what is the value of 'ç' in C?

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Subject: what_is_the_value_of_'ç'_in_C?
From: thiago.a...@gmail.com (Thiago Adams)
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 by: Thiago Adams - Mon, 28 Aug 2023 16:54 UTC

"The literal encoding is an implementation-defined mapping of the characters of the execution character
set to the values in a character constant (6.4.4.4) or string literal (6.4.5). It shall support a mapping
from all the basic execution character set values into the implementation-defined encoding. It may
contain multibyte character sequences (5.2.1.1)."

It can be anything? "implementation-defined"

If the source is encoded with utf8 it is like a multi char in gcc.
warning: multi-character character constant [-Wmultichar]
value is 50087

clang has an error message
error: character too large for enclosing character literal type

Could a compiler return 'ç' 231 that is the unicode value? considering " implementation-defined mapping"

Re: what is the value of 'ç' in C?

<fce42ce9-72d4-4790-abd5-02e12dd6e13dn@googlegroups.com>

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Subject: Re:_what_is_the_value_of_'ç'_in_C?
From: oot...@hot.ee (Öö Tiib)
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 by: Öö Tiib - Mon, 28 Aug 2023 21:30 UTC

On Monday, 28 August 2023 at 19:54:33 UTC+3, Thiago Adams wrote:
> "The literal encoding is an implementation-defined mapping of the characters of the execution character
> set to the values in a character constant (6.4.4.4) or string literal (6.4.5). It shall support a mapping
> from all the basic execution character set values into the implementation-defined encoding. It may
> contain multibyte character sequences (5.2.1.1)."
>
> It can be anything? "implementation-defined"
>
Implementation-defined means that a conforming implementation must define it somewhere.

> If the source is encoded with utf8 it is like a multi char in gcc.
> warning: multi-character character constant [-Wmultichar]
> value is 50087
>
Unicode defines it as letter (U+00E7) with two byte UTF-8 encoding 0xC3 0xA7. 0xc3a7 is
indeed 50087.

> clang has an error message
> error: character too large for enclosing character literal type
>
> Could a compiler return 'ç' 231 that is the unicode value? considering " implementation-defined mapping"

Compiler may, but I've not seen one to define it like that.
On some wchar_t c = L'ç'; will result with c having wchar_t value 231.

Re: what is the value of 'ç' in C?

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From: ben.use...@bsb.me.uk (Ben Bacarisse)
Newsgroups: comp.lang.c
Subject: Re: what is the value of 'ç' in C?
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 by: Ben Bacarisse - Mon, 28 Aug 2023 21:40 UTC

Thiago Adams <thiago.adams@gmail.com> writes:

> "The literal encoding is an implementation-defined mapping of the
> characters of the execution character set to the values in a character
> constant (6.4.4.4) or string literal (6.4.5). It shall support a
> mapping from all the basic execution character set values into the
> implementation-defined encoding. It may contain multibyte character
> sequences (5.2.1.1)."
>
> It can be anything? "implementation-defined"

Pretty much anything, though there are some results that are more
helpful and thus likely than others.

> If the source is encoded with utf8 it is like a multi char in gcc.
> warning: multi-character character constant [-Wmultichar]
> value is 50087

If you want a Unicode char, use u'ç'.

> clang has an error message
> error: character too large for enclosing character literal type
>
> Could a compiler return 'ç' 231 that is the unicode value? considering
> " implementation-defined mapping"

You (well I) can have 'ç' == 231 by compiling with

gcc -fexec-charset=iso-8859-1 -funsigned-char ...

my gcc lets me choose the execution character set.

--
Ben.

Re: what is the value of 'ç' in C?

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Subject: Re:_what_is_the_value_of_'ç'_in_C?
From: already5...@yahoo.com (Michael S)
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 by: Michael S - Tue, 29 Aug 2023 11:44 UTC

nothing

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