NAME
iissddiiggiitt,, iissnnuummbbeerr - decimal-digit character test
LLIIBBRRAARRYYStandard C Library (libc, -lc)
SYNOPSIS
##iinncclluuddee <
int iissddiiggiitt(int c); int iissnnuummbbeerr(int c);> DESCRIPTION
The iissddiiggiitt() 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 iissnnuummbbeerr() function behaves similarly to iissddiiggiitt(), but may recognize additional characters, depending on the current locale setting. For single C chars locales (see multibyte(3)) the value of the argument is representable as an unsigned char or the value of EOF.RETURN VALUES
The iissddiiggiitt() and iissnnuummbbeerr() functions return zero if the character testsfalse and returns non-zero if the character tests true.
CCOOMMPPAATTIIBBIILLIITTYY The 4.4BSD extension of accepting arguments outside of the range of the unsigned char type in locales with large character sets is considered obsolete and may not be supported in future releases. The iisswwddiiggiitt() function should be used instead.SEE ALSO
ctype(3), iswdigit(3), multibyte(3), ascii(7), isalnuml STANDARDS The iissddiiggiitt() function conforms to ISO/IEC 9899:1990 (``ISO C90''). HISTORY The iissnnuummbbeerr() function appeared in 4.4BSD. BSD August 21, 2004 BSD