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#include <stdio.h>
#include <wchar.h>
#include <string.h>
 
int main(void) {
	char32_t* str = L"日本語";
	int i;
	for (i = 0; i < wcslen(str); i++) {
        printf("%lc\n", str[i]);
    }
	return 0;
}
 

prog.c: In function 'main':
prog.c:6:2: error: unknown type name 'char32_t'
  char32_t* str = L"日本語";
  ^
prog.c:6:18: warning: initialization from incompatible pointer type
  char32_t* str = L"日本語";
                  ^
prog.c:8:25: warning: passing argument 1 of 'wcslen' from incompatible pointer type
  for (i = 0; i < wcslen(str); i++) {
                         ^
In file included from prog.c:2:0:
/usr/include/wchar.h:287:15: note: expected 'const wchar_t *' but argument is of type 'int *'
 extern size_t wcslen (const wchar_t *__s) __THROW __attribute_pure__;
               ^

Standard output is empty