Question: ID: CC 2 16. Write a BNF grammar for a login password, e.g. JDoe-900. There must be at least 3 letters in the first part

ID: CC 2 16. Write a BNF grammar for a login password, e.g. JDoe-900. There must be at least 3 letters in the

ID: CC 2 16. Write a BNF grammar for a login password, e.g. JDoe-900. There must be at least 3 letters in the first part up to a maximum of 5 letters. These letters can be either lower or upper case. The second part is optional and can be one of the three signs: =' +. The third part should be composed of 3 digits. (6 marks) ID: ..... 17. With the BNF grammar: ::= + | : := x | ::= () | ::= 0 | 1 | 2 | ... | 9 a) complete the parse tree below: 2 + 6 7 digit digit digit (6 marks)

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