FreeBSD Manual Pages
ISALPHA(3) BSD Library Functions Manual ISALPHA(3) NAME isalpha -- alphabetic character test LIBRARY Standard C Library (libc, -lc) 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. 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): 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. COMPATIBILITY The 4.4BSD extension of accepting arguments outside of the range of the unsigned char type in locales with large character sets is considered ob- solete and may not be supported in future releases. The iswalpha() func- tion should be used instead. SEE ALSO ctype(3), islower(3), isupper(3), iswalpha(3), ascii(7) STANDARDS The isalpha() function conforms to ISO/IEC 9899:1990 ("ISO C90"). BSD July 17, 2005 BSD
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | COMPATIBILITY | SEE ALSO | STANDARDS
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=isalpha&sektion=3&manpath=FreeBSD+7.4-RELEASE>