1.\" Copyright (c) 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)isalnum.3 5.1 (Berkeley) 05/02/91 7.\" 8.Dd 9.Dt ISALNUM 3 10.Os 11.Sh NAME 12.Nm isalnum 13.Nd alphanumeric character test 14.Sh SYNOPSIS 15.Fd #include <ctype.h> 16.Ft int 17.Fn isalnum "int c" 18.Sh DESCRIPTION 19The 20.Fn isalnum 21macro tests for any character for which 22.Xr isalpha 3 23or 24.Xr isdigit 3 25is true. 26.Sh RETURN VALUES 27The 28.Fn isalnum 29macro returns zero if the character tests false and 30returns non-zero if the character tests true. 31.Sh SEE ALSO 32.Xr isascii 3 , 33.Xr isalnum 3 , 34.Xr isalpha 3 , 35.Xr iscntrl 3 , 36.Xr isdigit 3 , 37.Xr isgraph 3 , 38.Xr islower 3 , 39.Xr isprint 3 , 40.Xr ispunct 3 , 41.Xr isspace 3 , 42.Xr isupper 3 , 43.Xr isxdigit 3 , 44.Xr toascii 3 , 45.Xr tolower 3 , 46.Xr toupper 3 , 47.Xr stdio 3 48.Xr ascii 7 49.Sh STANDARDS 50The 51.Fn isalnum 52function conforms to 53.St -ansiC . 54