| islower(3) | lower-case character test |
| islower_l, islower(3) | lower-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 |
| ISLOWER(3) | MidnightBSD Library Functions Manual | ISLOWER(3) |
islower —
lower-case character test
Standard C Library (libc, -lc)
#include
<ctype.h>
int
islower(int
c);
int
islower_l(int
c, locale_t
loc);
The
islower()
function tests for any lower-case letters. 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):
| 141 ``a'' | 142 ``b'' | 143 ``c'' | 144 ``d'' | 145 ``e'' |
| 146 ``f'' | 147 ``g'' | 150 ``h'' | 151 ``i'' | 152 ``j'' |
| 153 ``k'' | 154 ``l'' | 155 ``m'' | 156 ``n'' | 157 ``o'' |
| 160 ``p'' | 161 ``q'' | 162 ``r'' | 163 ``s'' | 164 ``t'' |
| 165 ``u'' | 166 ``v'' | 167 ``w'' | 170 ``x'' | 171 ``y'' |
| 172 ``z'' |
islower_l()
function takes an explicit locale argument, whereas the
islower() function uses the current global or
per-thread locale.
The islower() and
islower_l() functions return zero if the character
tests false and return 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 iswlower()
function should be used instead.
The islower() function conforms to
ISO/IEC 9899:1990 (“ISO C90”).
The islower_l() function conforms to
IEEE Std 1003.1-2008 (“POSIX.1”).
| July 30, 2012 | midnightbsd-3.1 |