1*22f7d534Sbostic.\" Copyright (c) 1991, 1993 2*22f7d534Sbostic.\" The Regents of the University of California. All rights reserved. 39e5144dfScael.\" 4791c68ebSbostic.\" This code is derived from software contributed to Berkeley by 5791c68ebSbostic.\" the American National Standards Committee X3, on Information 6791c68ebSbostic.\" Processing Systems. 7791c68ebSbostic.\" 89e5144dfScael.\" %sccs.include.redist.man% 99e5144dfScael.\" 10*22f7d534Sbostic.\" @(#)isdigit.3 8.1 (Berkeley) 06/04/93 119e5144dfScael.\" 129e5144dfScael.Dd 139e5144dfScael.Dt ISDIGIT 3 149e5144dfScael.Os 159e5144dfScael.Sh NAME 169e5144dfScael.Nm isdigit 179e5144dfScael.Nd decimal-digit character test 189e5144dfScael.Sh SYNOPSIS 199e5144dfScael.Fd #include <ctype.h> 209e5144dfScael.Ft int 21a8b77666Sbostic.Fn isdigit "int c"; 229e5144dfScael.Sh DESCRIPTION 239e5144dfScaelThe 249e5144dfScael.Fn isdigit 259e5144dfScaelfunction tests for any decimal-digit character. 2672dbba0eSbosticIn the ASCII character set, this includes the following characters: 2772dbba0eSbostic.sp 2872dbba0eSbostic.Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ 2972dbba0eSbostic.It \&060\ ``0'' \t061\ ``1'' \t062\ ``2'' \t063\ ``3'' \t064\ ``4'' 3072dbba0eSbostic.It \&065\ ``5'' \t066\ ``6'' \t067\ ``7'' \t070\ ``8'' \t071\ ``9'' 3172dbba0eSbostic.El 329e5144dfScael.Sh RETURN VALUES 339e5144dfScaelThe 349e5144dfScael.Fn isdigit 35a8b77666Sbosticfunction returns zero if the character tests false and 369e5144dfScaelreturns non-zero if the character tests true. 379e5144dfScael.Sh SEE ALSO 38a8b77666Sbostic.Xr ctype 3 , 399e5144dfScael.Xr ascii 7 409e5144dfScael.Sh STANDARDS 419e5144dfScaelThe 429e5144dfScael.Fn isdigit 439e5144dfScaelfunction conforms to 449e5144dfScael.St -ansiC . 45