isalphanum(3C)                 DG/UX 5.4R3.00                 isalphanum(3C)


NAME
       isalphanum - determine if a character is alphanumeric

SYNOPSIS
       #include <ctype.h>

       int c, result;
       ...
       result = isalphanum(c);

DESCRIPTION
       Use the isalphanum macro to determine whether a character is
       alphabetic or numeric.  isalphanum is the same as isalnum.
       Alphabetics are A-Z and a-z; numerics are 0-9.

       Do not try to redeclare this macro or you might get unexpected
       results.

   Return Value
       The isalphanum macro returns a nonzero value if the character is
       alphanumeric; otherwise, it returns 0.

EXAMPLES
       /* Program test for the isalphanum() macro */

       #include <ctype.h>
       #include <stdio.h>

       int  i = 1, result;

       main(argc, argv)
       int argc;
       char *argv[];
       {
           while (i < argc) {
               printf("Is character %c alphanumeric?  ", argv[i][0]);
      printf("%s.\n", (result = isalphanum(argv[i][0])) == 0 ? "No" : "Yes");
               i++;
           }
           return 0;
       }

       A call to the program test with the characters &, 7, \, and g
       generates the output

       Is character & alphanumeric? No.
       Is character 7 alphanumeric? Yes.
       Is character \ alphanumeric? No.
       Is character g alphanumeric? Yes.

SEE ALSO
       ishex(3C), isnan(3C).





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