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ISALPHA (3) | C library functions | Unix Manual Pages | :man▋
NAME
isalpha - alphabetic character test
CONTENTS
Library
Synopsis
Description
Return Values
Compatibility
See Also
Standards
LIBRARY
.Lb libc
SYNOPSIS
.In ctype.h int isalpha "int c"
DESCRIPTION
The isalpha function tests for any character for which isupper(3) or islower(3) is true. For single C char s locales (see multibyte(3)) the value of the argument is 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): "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.
COMPATIBILITY
The BSD 4.4 extension of accepting arguments outside of the range of the
.Vt "unsigned char" type in locales with large character sets is considered obsolete and may not be supported in future releases. The iswalpha function should be used instead.
SEE ALSO
ctype(3), islower(3), isupper(3), iswalpha(3), multibyte(3), ascii(7)
STANDARDS
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