HP 3000 Manuals

HP C/iX Library Reference Manual

isalpha 

Tests whether an argument is a letter.

Syntax 

     #include <ctype.h>
     int isalpha (int c);

Parameters 

c             An argument to be evaluated.  The argument must be
              representable as an unsigned char or the macro EOF.

Return Values 

!=0           The argument passed in c is a letter.

0             The argument passed in c is not a letter.

Description 

The isalpha macro returns a nonzero value if the argument passed in c is
a letter (ASCII characters A through Z, and a through z); otherwise, the
returned value is zero.

See Also 

isalnum(), iscntrl(), isdigit(), isgraph(), islower(), isprint(),
ispunct(), isspace(), isupper(), isxdigit(), ANSI C 4.3.1.2, POSIX.1 8.1

MPE/iX 5.0 Documentation