宽字符的操作

#include <stdio.h>
#include <wchar.h>
#include <wctype.h>

int main(void){
  wchar_t ch = 0;                                   // Stores a character

  fwprintf(stdout, LEnter a character:\n );
  fwscanf(stdin, L %lc, &ch, sizeof(ch));       // Read a non-whitespace character
  if(iswalnum(ch))                                  // Is it a letter or a digit?
  {
    if(iswdigit(ch))                                // Is it a digit?
      fwprintf(stdout, LYou entered the digit %lc\n, ch);
    else if(iswlower(ch))                           // Is a lowercase letter?
      fwprintf(stdout, LYou entered a lowercase %lc\n, towupper(ch));
    else
      fwprintf(stdout, LYou entered an uppercase %lc\n, towlower(ch));
   }
  else if(iswpunct(ch))                             // Is it punctuation?
    fwprintf(stdout, LYou entered the punctuation character %lc.\n, ch);
  else
    fwprintf(stdout, LYou entered %lc, but I don't know what it is!\n, ch);
  return 0;
}