Does C allow Unicode identifiers now, or is that pseudo code? The code snippets also contain `&`, so something definitely went wrong with the transcoding to HTML.
replies(4):
An identifier is an arbitrarily long sequence of digits, underscores, lowercase and uppercase Latin letters, and Unicode characters specified using \u and \U escape notation(since C99), of class XID_Continue(since C23). A valid identifier must begin with a non-digit character (Latin letter, underscore, or Unicode non-digit character(since C99)(until C23), or Unicode character of class XID_Start)(since C23)). Identifiers are case-sensitive (lowercase and uppercase letters are distinct). Every identifier must conform to Normalization Form C.(since C23)
In practice depends on the compiler.
Definitely a questionable choice to throw off readers with unicode weirdness in the very first code example.