iswupper

Header file: 

    wctype.h

Synopsis:

     int iswupper(wint_t wc)

Description:

     Return non-zero if the given input is a upper case letter.  Otherwise it returns 0.

Sample program for iswupper 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 (iswupper(wide_char))
                printf("It is a upper case  character\n");
        else
                printf("It is not a upper case character\n");

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

  Output:

  Enter your input:A
  It is a upper case  character
  Return value: 256