// crt_strlen.c  // Determine the length of a string. For the multi-byte character  // example to work correctly, the Japanese language support for  // non-Unicode programs must be enabled by the operating system.    #include <string.h>  #include <locale.h>    int main()  {     char* str1 = "Count.";     wchar_t* wstr1 = L"Count.";     char * mbstr1;     char * locale_string;       // strlen gives the length of single-byte character string     printf("Length of ‘%s‘ : %d\n", str1, strlen(str1) );       // wstrlen gives the length of a wide character string     wprintf(L"Length of ‘%s‘ : %d\n", wstr1, wcslen(wstr1) );       // A multibyte string: [A] [B] [C] [katakana A] [D] [\0]     // in Code Page 932. For this example to work correctly,     // the Japanese language support must be enabled by the     // operating system.     mbstr1 = "ABC" "\x83\x40" "D";       locale_string = setlocale(LC_CTYPE, "Japanese_Japan");       if (locale_string == NULL)     {        printf("Japanese locale not enabled. Exiting.\n");        exit(1);     }     else     {        printf("Locale set to %s\n", locale_string);     }       // _mbslen will recognize the Japanese multibyte character if the     // current locale used by the operating system is Japanese     printf("Length of ‘%s‘ : %d\n", mbstr1, _mbslen(mbstr1) );       // _mbstrlen will recognize the Japanese multibyte character     // since the CRT locale is set to Japanese even if the OS locale     // isnot.      printf("Length of ‘%s‘ : %d\n", mbstr1, _mbstrlen(mbstr1) );     printf("Bytes in ‘%s‘ : %d\n", mbstr1, strlen(mbstr1) );       }