| isupper(3) | upper-case character test |
| ctype, digittoint, isalnum, isalpha, isascii, iscntrl, isdigit, isgraph, ishexnumber, isideogram, islower, isnumber, isphonogram, isprint, ispunct, isrune, isspace, isspecial, isupper, isxdigit, toascii, tolower, toupper, isblank(3) | character classification functions |
| ISUPPER(3) | MidnightBSD Library Functions Manual | ISUPPER(3) |
isupper —
upper-case character test
Standard C Library (libc, -lc)
#include
<ctype.h>
int
isupper(int
c);
The
isupper()
function 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 isupper() function returns zero if the
character tests false and returns non-zero if the character tests true.
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()
function should be used instead.
The isupper() function conforms to
ISO/IEC 9899:1990
(“ISO C90”).
| July 17, 2005 | midnightbsd-3.1 |