ISALPHA(3) MachTen Programmer’s 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 re-
turns non-zero if the character tests true.