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Man Pages


Manual Reference Pages  -  ISNUMBER (3)

NAME

isdigit, isnumber - decimal-digit character test

CONTENTS

Library
Synopsis
Description
Return Values
Compatibility
See Also
Standards
History

LIBRARY


.Lb libc

SYNOPSIS


.In ctype.h int isdigit int c int isnumber int c int isdigit_l int c locale_t loc int isnumber_l int c locale_t loc

DESCRIPTION

The isdigit function tests for a decimal digit character. Regardless of locale, this includes the following characters only:
‘‘0’’      ‘‘1’’      ‘‘2’’      ‘‘3’’      ‘‘4’’
‘‘5’’      ‘‘6’’      ‘‘7’’      ‘‘8’’      ‘‘9’’
 

The isnumber function behaves similarly to isdigit, but may recognize additional characters, depending on the current locale setting.

The value of the argument must be representable as an
.Vt unsigned char or the value of EOF.

The _l-suffixed versions take an explicit locale argument, whereas the non-suffixed versions use the current global or per-thread locale.

RETURN VALUES

The isdigit and isnumber functions return zero if the character tests false and return non-zero if the character tests true.

COMPATIBILITY

The BSD 4.4 extension of accepting arguments outside of the range of the
.Vt unsigned char type in locales with large character sets is considered obsolete and may not be supported in future releases. The iswdigit function should be used instead.

SEE ALSO

ctype(3), iswdigit(3), multibyte(3), xlocale(3), ascii(7)

STANDARDS

The isdigit function conforms to -isoC. The isdigit_l function conforms to -p1003.1-2008.

HISTORY

The isnumber function appeared in BSD 4.4 .
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