Any downsides using '?' instead of L'?' with wchar_t?

The only downside is that your program might fail on stone-age systems using EBCDIC. On any real world system worth consideration char and wchar_t values for the portable character set are all ASCII, and on increasingly many (but not all) wchar_t is a Unicode codepoint number.

They have the wrong datatype and encoding, so that's a bad idea. The compiler will silently widen character literals (for strings you'd get a type mismatch compile error), using the standard integral conversions (such as sign-extension). But the value might not match.

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