isalpha() -- ctype Function (libc)

Check if a character is a letter
#include <ctype.h>
int isalpha(c) int c;

isalpha()  tests whether  the argument  c  is a  letter (A-Z  or a-z).   It
returns a number other than zero  if c is an alphabetic character, and zero
if it is not.  isalpha() assumes that c is an ASCII character or EOF.

Example

For an example of this macro, see the entry for ctype.h.

See Also

ASCII,
libc
ANSI Standard, §7.3.1.2
POSIX Standard, §8.1

© 2012 by Stephen A. Ness