HP 3000 Manuals

HP C/iX Library Reference Manual

isalnum 

Tests whether an argument is a letter or a decimal digit.

Syntax 

     #include <ctype.h>
     int isalnum (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 or a decimal digit.

0             The argument passed in c is not a letter or a decimal
              digit.

Description 

The isalnum function returns a nonzero value if the argument passed in c 
is a letter or a decimal digit (ASCII characters 0 through 9, A through
Z, and a through z); otherwise, zero is returned.

See Also 

isalpha(), iscntrl(), isdigit(), isgraph(), islower(), isprint(),
ispunct(), isspace(), isupper(), isxdigit(), ANSI C 4.3.1.1, POSIX.1 8.1

MPE/iX 5.0 Documentation