iissxxddiiggiitt() -- ctype Function (libc)

Check if a character is a hexadecimal numeral
#iinncclluuddee <ccttyyppee.hh>
iinntt iissxxddiiggiitt(_c)
iinntt _c;

iissxxddiiggiitt() tests whether _c is a  hexadecimal numeral -- that is, any of the
characters `0' through  `9', any of the letters `a'  through `d', or any of
the letters `A' through `D'.  _c must be a value that is representable as an
uunnssiiggnneedd cchhaarr or EEOOFF.

iissxxddiiggiitt() returns nonzero if _c is a hexadecimal numeral, and zero if it is
not.

_S_e_e _A_l_s_o
AASSCCIIII, lliibbcc
ANSI Standard, section 7.3.1.11
POSIX Standard, section 8.1

