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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. For single C chars 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 charac-ters characters ters (preceded by their numeric values, 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 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 iswalpha() function should be used instead. SEE ALSO ctype(3), isalnum_l(3), islower(3), isupper(3), iswalpha(3), multibyte(3), ascii(7) STANDARDS The isalpha() function conforms to ISO/IEC 9899:1990 (``ISO C90''). BSD August 21, 2004 BSD |