iswalpha

Header file:

    wctype.h

Synopsis:

    int iswalpha(wint_t input)

Description:

    Returns non-zero if input is an alphabetic character.  Otherwise it returns 0.

Sample program for iswalpha in C:

---

  #include <stdio.h>
  #include <wchar.h>
  #include <wctype.h>
  int main() {
        wint_t wide_char;
        char input;
        printf("Enter your input:");
        input = getchar();

        /* mbtowc -Converts single byte to wide character format */
        wide_char = btowc(input);

        if (iswalpha(wide_char))
                printf("It is an alphabet\n");
        else
                printf("It is not an alphabet\n");

        printf("Return value: %d\n", iswalpha(wide_char));
        return 0;
  }

  Output:

  jp@jp-VirtualBox:~/cpgms/chap4$ ./a.out
  Enter your input:1
  It is not an alphabet
  Return value: 0