Use iswalnum function to check if a wider character is an alphabet or a digit

Syntax

C iswalnum function has the following format.

Header

C iswalnum function is from header file wctype.h.

Description

C iswalnum function returns nonzero if its argument is either a letter of the alphabet or a digit.

It returns zero if the character is not alphanumeric.

Example

Use C iswalnum function to check if a wider character is an alphabet or a digit.

#include <stdio.h>
#include <wctype.h>
/*w w w. j a  v  a2s  .co  m*/
int main(void)
{
   int wc;

   for (wc=0; wc <= 0xFF; wc++) {
      printf("%3d", wc);
      printf(" %#4x ", wc);
      printf("%3s", iswalnum(wc)  ? "AN" : " ");

      putchar('\n');
   }
}

The code above generates the following result.