ITPEC Textbook
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Chapter 3 · SoftwarePractice
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CONCEPT PRACTICE

Original BNF rules and derivation

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2023 Spring · Morning · Q5

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Q5. Which of the following matches the <variable-name> defined below in BNF? <number> :: = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 <letter> :: = A | B | C | D | E | F <letter-and-number> :: = <letter> | <number> | _ <variable-name> :: = <letter> | <variable-name><letter-and-number>

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Source: 2023S_FE_AM_Questions.pdf, PDF page 4. ID: 2023S-AM-Q005. Explanation written for this textbook.

Original question · Q5
Q5. Which of the following matches the <variable-name> defined below in BNF? <number> :: = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 <letter> :: = A | B | C | D | E | F <letter-and-number> :: = <letter> | <number> | _ <variable-name> :: = <letter> | <variable-name><letter-and-number>

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