NAME

isupper - test for an upper-case letter

SYNOPSIS

#include "zkCtype.h"

int isupper(int c);

DESCRIPTION

The isupper() function tests whether c is a character of class upper in the program's current locale.

In all cases c is an int, the value of which must be a character representable as an unsigned char or must equal the value of the macro EOF. If the argument has any other value, the behaviour is undefined.

RETURN VALUE

The isupper() function returns non-zero if c is an upper-case letter; otherwise it returns 0.

ERRORS

No errors are defined.

PORTABILITY

To ensure applications portability, especially across natural languages, only this function and those listed in the SEE ALSO section should be used for character classification.

SEE ALSO

isalnum(), isalpha(), iscntrl(), isdigit(), isgraph(), islower(), isprint(), ispunct(), isspace(), isxdigit().