Context Free Grammar in BNF?

[Eric]

How do you write a context-free grammar in BNF for a language that requires
Boolean variables to be used before Boolean expression assignments (the
only kind of statements allowed in the language).

 

[Jack Klein]

How do you write a context-free grammar in BNF for a language that requires
Boolean variables to be used before Boolean expression assignments (the
only kind of statements allowed in the language).

I don't see any sort of question in here about the C++ programming
language.

Try either or both of and
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