This documentation is copyright © 1998-2001 Sandro Sigala <sandro@sigala.it>.
All rights reserved.
Released under the GNU General Public License.
isupper
Prototype
#include <ctype.h>
int isupper(int c);
Description
In the ``C'' locale, returns a true value for the characters defined
as uppercase letters. In other implementation-defined set
of characters returns true for the characters for which none of
iscntrl
, isdigit
, ispunct
, or isspace
is true.
Example
#include <ctype.h>
/*
* Return a true value if the argument string is a word in the
* [A-Z][A-Za-z]* format, i.e. the first character is uppercase,
* the others, if exist, uppercase or lowercase.
*/
int is_uword(const char *s)
{
if (!isupper(*s))
return 0;
for (++s; *s != '\0'; ++s)
if (!isalpha(*s))
return 0;
return 1;
}
References
ISO C 9899:1990 7.3.1.10