ISALPHA man page on 4.4BSD
[printable version]
ISALPHA(3) BSD Library Functions Manual ISALPHA(3)
NAME
isalpha — alphabetic character test
SYNOPSIS
#include <ctype.h>
int
isalpha(int c);;
DESCRIPTION
The isalpha() function tests for any character for which isupper(3) or
islower(3) is true. In the ASCII character set, this includes the fol‐
lowing characters:
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''
RETURN VALUES
The isalpha() function returns zero if the character tests false and
returns non-zero if the character tests true.
SEE ALSO
ctype(3), ascii(7)
STANDARDS
The isalpha() function conforms to ANSI X3.159-1989 (“ANSI C89”).
BSD June 4, 1993 BSD
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