ISLOWER(3) | Library Functions Manual | ISLOWER(3) |
islower
—
lower-case character test
Standard C Library (libc, -lc)
#include
<ctype.h>
int
islower
(int
c);
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'' |
The islower
() 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 iswlower
()
function should be used instead.
The islower
() function conforms to
ISO/IEC 9899:1990
(“ISO C90”).
July 17, 2005 | macOS 14.6 |