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((Talk header]]
I don't think C source code listing is appropriate for any encyclopedia article. Why not cut out the "Implementation" section, and rather include an external link to a website with the code? Chitu 19:12, 13 May 2004 (UTC)
Erm... There is no such thing as a "Linus Torvalds's kernel mailing list post below" in the article... Medinoc 09:24, 16 May 2007 (UTC)
>> The correct way to use char arguments is to first cast them to unsigned char.
This is incorrect. If the argument is representable in an unsigned char, then it is a non-negative number, this is what "representable in an unsigned char" means, so conversion to int type will not make it negative or change the bit pattern in any way. —Preceding unsigned comment added by Velco (talk • contribs) 18:20, 2 November 2008 (UTC)
#include <stdio.h>
#include <ctype.h>
int main(void) {
signed char c;
printf("%s", "Type a letter.\n");
c = getchar();
if( isupper( (unsigned char) c ) ){
printf("%s", "Uppercase! YAY!\n");
}else{
printf("%s", "not uppercase.\n");
};
return 0;
}
seems correct to me. Or is there something that needs to be fixed? Leaving out that (unsigned char) cast
...
if( isupper( c ) ){ // incorrect
...
seems incorrect to me, as it could potentially pass a negative integer to isupper(). --68.0.124.33 (talk) 20:23, 6 March 2009 (UTC)
Casting to unsigned char means you don't correctly consider EOF. I believe the safest method is to first check for EOF, and then cast to unsigned char. I'll update this on the page as well. Kasterma (talk) 13:22, 6 July 2011 (UTC)
There is a move discussion in progress which affects this page. Please participate at Talk:C standard library - Requested move and not in this talk page section. Thank you. —RM bot 09:40, 8 November 2011 (UTC)
It is not clear if this library intend to addressee i18n (internationalisation) issues such as ISO-2022 or its Unicode concurrent. Which one does C support best?
It is not clear how C character classification should be considered in regard to the single byte character vs multiple byte vs wide character context.
Also: Is there any classification for the Byte Order Mark? — Preceding unsigned comment added by 84.97.14.22 (talk) 20:01, 22 July 2012 (UTC)
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The above message was substituted from ((IEP assignment))
by PrimeBOT (talk) on 19:56, 1 February 2023 (UTC)