iissaallnnuumm() -- ctype Function (libc)

Check if a character is a number or letter
#iinncclluuddee <ccttyyppee.hh>
iinntt iissaallnnuumm(_c) iinntt _c;

iissaallnnuumm() tests whether the argument  _c is alphanumeric (00-99, AA-ZZ, or aa-zz).
It returns a  number other than zero if _c  is of the desired type, and zero
if it is not.  iissaallnnuumm() assumes that _c is an ASCII character or EOF.

_E_x_a_m_p_l_e
For an example of how to use this macro, see the entry for ccttyyppee.hh.

_S_e_e _A_l_s_o
AASSCCIIII, lliibbcc
ANSI Standard, section 7.3.1.1
POSIX Standard, section 8.1
