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#include <stdio.h>
#include <uchar.h>
 
int main(void)
{
 const char16_t wcs[] = u"zß水🍌"; // or "z\u00df\u6c34\U0001f34c"
 const size_t wcs_sz = sizeof wcs / sizeof *wcs;
 printf ("%zu UTF-16 code units: [ ", wcs_sz);
 for (size_t n = 0; n < wcs_sz; ++n)
 printf ("%#x ", wcs[n]);
 printf ("]\n");
}

Possible output:

6 UTF-16 code units: [ 0x7a 0xdf 0x6c34 0xd83c 0xdf4c 0 ]

• C17 standard (ISO/IEC 9899:2018):

• 7.28 Unicode utilities <uchar.h> (p: 292)

• 7.20.1.2 Minimum-width integer types (p: 212-213)

• C11 standard (ISO/IEC 9899:2011):

• 7.28 Unicode utilities <uchar.h> (p: 398)

• 7.20.1.2 Minimum-width integer types (p: 290)

• C99 standard (ISO/IEC 9899:1999):

• 7.18.1.2 Minimum-width integer types (p: 256)