ISALNUM(3) | Library Functions Manual | ISALNUM(3) |
isalnum
—
alphanumeric character test
Standard C Library (libc, -lc)
#include
<ctype.h>
int
isalnum
(int
c);
The
isalnum
()
function tests for any character for which
isalpha(3) or
isdigit(3) is true. 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 (preceded by their numeric values, in octal):
060 ``0'' 061 ``1'' 062 ``2'' 063 ``3'' 064 ``4'' |
065 ``5'' 066 ``6'' 067 ``7'' 070 ``8'' 071 ``9'' |
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'' 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 isalnum
() 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 iswalnum
()
function should be used instead.
ctype(3), isalnum_l(3), isalpha(3), isdigit(3), iswalnum(3), ascii(7)
The isalnum
() function conforms to
ISO/IEC 9899:1990
(“ISO C90”).
July 17, 2005 | macOS 14.6 |