Is endian conversion required for wchar_t data?

Question

In C/C++, if a multi-byte wide character (wchar_t) value is transmitted from a big-endian system to a little-endian system (or vice-versa), will it come out the same value o

Answer 1

Endian conversion is not sufficient and as a consequence not needed. Sizeof(wchar_t) differs, and therefore the encoding too. Hence, you need to agree on an interchange format. The logical choice is UTF-8. But since UTF-8 is byte-oriented, you do not have endianness issues anymore.