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.\" @(#)isalnum.3 5.2 (Berkeley) 06/29/91 11.\" 12.Dd 13.Dt ISALNUM 3 14.Os 15.Sh NAME 16.Nm isalnum 17.Nd alphanumeric character test 18.Sh SYNOPSIS 19.Fd #include <ctype.h> 20.Ft int 21.Fn isalnum "int c" 22.Sh DESCRIPTION 23The 24.Fn isalnum 25macro tests for any character for which 26.Xr isalpha 3 27or 28.Xr isdigit 3 29is true. 30.Sh RETURN VALUES 31The 32.Fn isalnum 33macro returns zero if the character tests false and 34returns non-zero if the character tests true. 35.Sh SEE ALSO 36.Xr isascii 3 , 37.Xr isalnum 3 , 38.Xr isalpha 3 , 39.Xr iscntrl 3 , 40.Xr isdigit 3 , 41.Xr isgraph 3 , 42.Xr islower 3 , 43.Xr isprint 3 , 44.Xr ispunct 3 , 45.Xr isspace 3 , 46.Xr isupper 3 , 47.Xr isxdigit 3 , 48.Xr toascii 3 , 49.Xr tolower 3 , 50.Xr toupper 3 , 51.Xr stdio 3 52.Xr ascii 7 53.Sh STANDARDS 54The 55.Fn isalnum 56function conforms to 57.St -ansiC . 58