1.\" Copyright (c) 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the American National Standards Committee X3, on Information 6.\" Processing Systems. 7.\" 8.\" %sccs.include.redist.man% 9.\" 10.\" @(#)isalpha.3 5.4 (Berkeley) 10/27/91 11.\" 12.Dd 13.Dt ISALPHA 3 14.Os 15.Sh NAME 16.Nm isalpha 17.Nd alphabetic character test 18.Sh SYNOPSIS 19.Fd #include <ctype.h> 20.Ft int 21.Fn isalpha "int c"; 22.Sh DESCRIPTION 23The 24.Fn isalpha 25function tests for any character for which 26.Xr isupper 3 27or 28.Xr islower 3 29is true. 30In the ASCII character set, this includes the following characters: 31.sp 32.Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ 33.It \&101\ ``A'' \t102\ ``B'' \t103\ ``C'' \t104\ ``D'' \t105\ ``E'' 34.It \&106\ ``F'' \t107\ ``G'' \t110\ ``H'' \t111\ ``I'' \t112\ ``J'' 35.It \&113\ ``K'' \t114\ ``L'' \t115\ ``M'' \t116\ ``N'' \t117\ ``O'' 36.It \&120\ ``P'' \t121\ ``Q'' \t122\ ``R'' \t123\ ``S'' \t124\ ``T'' 37.It \&125\ ``U'' \t126\ ``V'' \t127\ ``W'' \t130\ ``X'' \t131\ ``Y'' 38.It \&132\ ``Z'' \t141\ ``a'' \t142\ ``b'' \t143\ ``c'' \t144\ ``d'' 39.It \&145\ ``e'' \t146\ ``f'' \t147\ ``g'' \t150\ ``h'' \t151\ ``i'' 40.It \&152\ ``j'' \t153\ ``k'' \t154\ ``l'' \t155\ ``m'' \t156\ ``n'' 41.It \&157\ ``o'' \t160\ ``p'' \t161\ ``q'' \t162\ ``r'' \t163\ ``s'' 42.It \&164\ ``t'' \t165\ ``u'' \t166\ ``v'' \t167\ ``w'' \t170\ ``x'' 43.It \&171\ ``y'' \t172\ ``z'' 44.El 45.Sh RETURN VALUES 46The 47.Fn isalpha 48function returns zero if the character tests false and 49returns non-zero if the character tests true. 50.Sh SEE ALSO 51.Xr ctype 3 , 52.Xr ascii 7 53.Sh STANDARDS 54The 55.Fn isalpha 56function conforms to 57.St -ansiC . 58