Question: 4. Convert the following BNFs for simple Java statements into Extended BNFs. (a) -> if ( ) -> if ( ) else (b) I /

4. Convert the following BNFs for simple Java statements into Extended BNFs. (a) -> if ( ) -> if ( ) else (b) I/% (c) begin \{\} end (d) identifier | identifier, 5. Convert the following EBNF to BNF: SA{bA}Aa[b]A 6. Compute the weakest precondition for each of the following selection constructs and their postconditions: (a) if (a==b) b=2a+1 else b=2a; {b>1} (b) if (xy) y=2x+1 else y=3x1; {y>3}

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