ISUPPER(3)

NAME
isupper - upper-case character test

SYNOPSIS
#include <ctype.h>
int
isupper(int c);

DESCRIPTION
The isupper() function tests for any upper-case letter or any of an implementation-defined set of characters for which none of iscntrl(3), isdigit(3), ispunct(3), or isspace(3) is true. In the C locale, isupper() returns true only for the characters defined as upper-case letters.

RETURN VALUES
The isupper() macro returns zero if the character tests false or non-zero if the character tests true.

SEE ALSO
isalnum(3), isalpha(3), isascii(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)

STANDARDS
The isupper() function conforms to ansiC.

CAVEATS
The argument to isupper() must be EOF or representable as an unsigned char; otherwise, the result is undefined.