gistfile1.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <locale.h>

#define MYLOCALE "de_DE.UTF-8"

int widecharcomp(const wchar_t *arg1, const wchar_t *arg2)
{
    return wcscoll(arg1, arg2);
}

int main (void) {

    struct lconv *locale_ptr;

    wchar_t a = L'a';
    wchar_t a1 = L'ä';
    wchar_t b = L'z';
    wchar_t jpn = L'\x3074';            // single Japanese character
    wchar_t wrd[] = {a, a1, b, '\0'};   // putting chars together into string
    wchar_t french[] = L"\x0152uf";  
    wchar_t chararray[] = {b, a, a1};    // array of wide single characters
    size_t length;

    setlocale(LC_ALL, MYLOCALE);
    if (setlocale(LC_COLLATE, MYLOCALE) == NULL) {
	    fprintf(stderr, "Can't set the locale %s. "
            "Check LANG, LC_CTYPE, LC_ALL.\n", MYLOCALE);
        return 1; 
	} 
    
	locale_ptr = localeconv();

    length = wcslen(chararray);
    qsort(chararray, length, sizeof(wchar_t), widecharcomp);
//    qsort(chararray, length, sizeof(wchar_t), wcscoll);
    chararray[length++] = '\0';

	printf("Currency symbol: %s\n", locale_ptr->currency_symbol);
	printf("A single ascii character: %lc\n", a);
	printf("A single accentuated Latin character: %lc\n", a1);
	printf("A single Japanese character %lc\n", jpn);
	printf("A word in French: %ls\n", french);
	printf("Three characters in an array: %ls\n", wrd);
	printf("The same characters alphabetically sorted: %ls\n", chararray);
	printf("Size in bytes of the French word: %zu\n", sizeof french);
	printf("...of the Latin non-ascii char: %zu\n", sizeof a1);
	printf("...of the Japanese char: %zu\n", sizeof jpn);
	printf("Length of the char array: %zu\n", wcslen(chararray));
	printf("Comparison of first two chars in char array: %d\n", wcscoll(&a, &a1));
	printf("Comparison of last two chars in char array: %d\n", wcscoll(&a1, &b));

	return 0;
}