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ISDIGIT (3) | C library functions | Unix Manual Pages | :man▋
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"
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. For single C char s locales (see multibyte(3)) the value of the argument is representable as an unsigned char or the value of EOF.
RETURN VALUES
The isdigit and isnumber functions return zero if the character tests false and returns 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), ascii(7)
STANDARDS
HISTORY
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