NAME
isupper, isupper_l
— upper-case character
test
LIBRARY
library “libc”
SYNOPSIS
#include
<ctype.h>
int
isupper(int
c);
int
isupper_l int c locale_t locale
DESCRIPTION
Theisupper()
and
isupper_l()
functions tests for any upper-case letter. The value of the argument must be
representable as an unsigned char or the value of
EOF.
In the ASCII character set, this includes the following characters (with their numeric values shown in octal):
| 101 ``A'' | 102 ``B'' | 103 ``C'' | 104 ``D'' | 105 ``E'' |
| 106 ``F'' | 107 ``G'' | 110 ``H'' | 111 ``I'' | 112 ``J'' |
| 113 ``K'' | 114 ``L'' | 115 ``M'' | 116 ``N'' | 117 ``O'' |
| 120 ``P'' | 121 ``Q'' | 122 ``R'' | 123 ``S'' | 124 ``T'' |
| 125 ``U'' | 126 ``V'' | 127 ``W'' | 130 ``X'' | 131 ``Y'' |
| 132 ``Z'' |
The _l-suffixed version takes an explicit locale argument, whereas the non-suffixed version uses the current global or per-thread locale.
RETURN VALUES
The isupper() and
isupper_l() functions return zero if the character
tests false and returns non-zero if the character tests true.
COMPATIBILITY
The 4.4BSD extension of accepting
arguments outside of the range of the unsigned char
type in locales with large character sets is considered obsolete and may not
be supported in future releases. The iswupper() and
iswupper_l() functions should be used instead.
SEE ALSO
ctype(3), ctype_l(3), iswupper(3), iswupper_l(3), toupper(3), xlocale(3), ascii(7)
STANDARDS
The isupper() function conforms to
ISO/IEC 9899:1990 (“ISO C90”).
The isupper_l() function conforms to
IEEE Std 1003.1-2008 (“POSIX.1”).