The fputwc function writes the wide character wc to the output stream pointed to by stream.
The putwc function acts essentially identically to fputwc.
The putwchar function is identical to putwc with an output stream of stdout.
The fputwc, putwc, and putwchar functions return the wide character written. If an error occurs, the value WEOF is returned.
ferror(3), fopen(3), getwc(3), putc(3), stdio(3)