ISUPPER
Section: C Library Functions (3)
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BSD mandoc
NAME
isupper
- upper-case character test
SYNOPSIS
Fd #include <ctype.h>
Ft int
Fn isupper int c
DESCRIPTION
The
Fn 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,
Fn isupper
returns true only for the characters defined as upper-case letters.
RETURN VALUES
The
Fn isupper
macro returns zero if the character tests false and
returns 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),
toascii(3),
tolower(3),
toupper(3),
stdio(3),
ascii(7)
STANDARDS
The
isupper
function conforms to
St -ansiC .
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUES
-
- SEE ALSO
-
- STANDARDS
-
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Time: 21:44:09 GMT, August 05, 2022