Determines whether a character is an alphabetic character.
Files
lib_ascii.h/lib_ascii.c
Prototypes
Arguments
c
Character to examine.
Returned Value
DEF_YES
,
if character is an alphabetic character;
DEF_NO
,
if character is not an alphabetic character.
Required Configuration
None.
Notes / Warnings
ISO/IEC 9899:TC2, Section 7.4.1.2.(2) states that “isalpha()
returns true only for the characters for which isupper()
or islower()
is true”.