int isalpha(int c);
The isalpha() function tests for any character for which
isupper() or islower() is true,
or any character that is one of an implementation-defined set of characters for
which none of iscntrl(), isdigit(),
ispunct(), or isspace() is true.
In the C locale, isalpha() returns true only for the
characters for which isupper() or
islower() is true.
The behavior of the isalpha() function is affected by the
current locale. To modify the behavior, change the LC_CTYPE
category in setlocale(), that is,
setlocale(LC_CTYPE, newlocale). In the C locale
or in a locale where character type information is not defined,
characters are classified according to the rules of the U.S.
ASCII 7-bit coded character set.
Is an integer whose value is representable as an unsigned char
or the value of the macro EOF.
The isalpha() function
returns non-zero for true and zero for false. If the parameter is
not in the domain of the function, the return result is undefined.
MT-Safe, with exceptions.
This function is MT-Safe as long as no thread calls setlocale() while
this function is executing.
PTC MKS Toolkit for Professional Developers
PTC MKS Toolkit for Enterprise Developers
PTC MKS Toolkit for Enterprise Developers 64-Bit Edition
- isalnum(), isascii(), iscntrl(), isdigit(), isgraph(), islower(), isprint(), ispunct(), isspace(), isupper(), isxdigit(), setlocale()
PTC MKS Toolkit 10.0 Documentation Build 6.