wctype

---

1. Character Classification:

#include <wctype.h>

int main() {
  wint_t wc = L'A';
  if (iswalpha(wc)) {
    printf("'%lc' is an alphabetical character.\n", wc);
  }
  return 0;
}

2. Case Conversion:

#include <wctype.h>

int main() {
  wint_t wc = L'a';
  wc = towupper(wc);
  printf("'%lc' converted to uppercase is '%lc'.\n", wc);
  return 0;
}

3. Character Width Determination:

#include <wctype.h>

int main() {
  wint_t wc = L'あ';
  int width = wcswidth(&wc, 1);
  printf("The width of character '%lc' is %d.\n", wc, width);
  return 0;
}

4. Text Collation:

#include <wctype.h>
#include <locale.h>

int main() {
  setlocale(LC_COLLATE, "en_US.UTF-8");
  wint_t a = L'A', b = L'B';
  int cmp = wcscoll(&a, &b);
  printf("The result of strcmp() is %d.\n", cmp);
  return 0;
}

5. Character Transformation:

#include <wctype.h>

int main() {
  wint_t wc = L'é';
  wc = towlower(wc);
  printf("'%lc' transformed to lowercase is '%lc'.\n", wc);
  return 0;
}

6. Character Mapping:

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

int main() {
  wchar_t wcs[] = L"Hello, world!";
  for (size_t i = 0; i < wcslen(wcs); i++) {
    wint_t wc = towupper(wcs[i]);
    wcs[i] = wc;
  }
  printf("Uppercase string: %ls\n", wcs);
  return 0;
}

7. Case-Insensitive String Comparison:

#include <wctype.h>

int main() {
  const wchar_t *str1 = L"Hello", *str2 = L"HELLO";
  int cmp = wcscasecmp(str1, str2);
  printf("Result of wcscasecmp(): %d\n", cmp);
  return 0;
}

8. Character Set Determination:

#include <wctype.h>

int main() {
  wint_t wc = L'€';
  if (iswspace(wc)) {
    printf("'%lc' is a whitespace character.\n", wc);
  }
  return 0;
}

9. Wide String Manipulation:

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

int main() {
  wchar_t wcs[] = L"Hello, world!";
  size_t idx = wcscspn(wcs, L" !.");
  printf("The length of the initial segment without spaces: %zu\n", idx);
  return 0;
}

10. String Tokenization:

#include <wctype.h>

int main() {
  const wchar_t *str = L"This is a sample string";
  wchar_t *token = wcstok(wstr, L" ");
  while (token != NULL) {
    printf("%ls\n", token);
    token = wcstok(NULL, L" ");
  }
  return 0;
}

11. Wide String Trimming:

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

int main() {
  wchar_t str[] = L" Hello, world! ";
  wcsptrim(str);
  printf("Trimmed string: %ls\n", str);
  return 0;
}

12. Wide String Reversal:

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

int main() {
  wchar_t str[] = L"Hello, world!";
  wcsrtombs(str, str, wcslen(str));
  printf("Reversed string: %ls\n", str);
  return 0;
}

13. Wide String Interpolation:

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

int main() {
  wchar_t str[100];
  size_t size = wcsftime(str, 100, L"%Y-%m-%d %H:%M:%S", gmtime(NULL));
  printf("Current time: %ls\n", str);
  return 0;
}

14. Character Code Conversion:

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

int main() {
  wint_t wc = L'€';
  char mb = wctomb(NULL, wc);
  printf("Multibyte representation: %c\n", mb);
  return 0;
}

15. Wide String Length:

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

int main() {
  const wchar_t *str = L"Hello, world!";
  size_t len = wcslen(str);
  printf("String length: %zu\n", len);
  return 0;
}

16. Wide String Concatenation:

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

int main() {
  wchar_t str1[] = L"Hello", str2[] = L" world!";
  wcscat(str1, str2);
  printf("Concatenated string: %ls\n", str1);
  return 0;
}

17. Wide String Copying:

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

int main() {
  wchar_t str1[] = L"Hello", str2[6];
  wcscpy(str2, str1);
  printf("Copied string: %ls\n", str2);
  return 0;
}

18. Wide String Comparison:

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

int main() {
  const wchar_t *str1 = L"Hello", *str2 = L"HELLO";
  int cmp = wcscmp(str1, str2);
  printf("Comparison result: %d\n", cmp);
  return 0;
}

19. Wide String Searching:

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

int main() {
  const wchar_t *str = L"Hello, world!";
  wchar_t *result = wcsstr(str, L"world");
  printf("Index of substring: %d\n", result - str);
  return 0;
}

20. Wide String Replacement:

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

int main() {
  wchar_t str[] = L"Hello, world!";
  wcscat(str, L" replaced");
  printf("Replaced string: %ls\n", str);
  return 0;
}

21. Wide String Splitting:

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

int main() {
  const wchar_t *str = L"This is a sample string";
  wchar_t *token = wcstok(wstr, L" ");
  while (token != NULL) {
    printf("%ls\n", token);
    token = wcstok(NULL, L" ");
  }
  return 0;
}

22. Wide String Padding:

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

int main() {
  wchar_t str[100];
  swprintf(str, 100, L"%10s", L"Hello");
  printf("Padded string: %ls\n", str);
  return 0;
}

23. Wide String Centering:

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

int main() {
  wchar_t str[100];
  swprintf(str, 100, L"%-10s", L"Hello");
  printf("Centered string: %ls\n", str);
  return 0;
}