This is a test paper, please answer only the answer should be written, do not need to explain the process in detail. Guarantee to complete every question, thank you very much! If you can not complete all the questions, please do not answer, I believe there will be people who help me, thank you!

Explain difference between static and dynamic scope. Show an example with different output for dynamic and static scope. Give unambiguous grammar for nested if-then-else structure. Using the same unambiguous grammar show how we can parse the following structure of if then else statement: 6. 7. if E1 then if E2 then S1 else S2 else S3 8. What are different address mechanisms? Which one is more efficient? Explain using examples for each address mechanism 9 Explain concept of Lexical Analysis 10. How does EBNF improve BNF? Convert following BNF into EBNF for definitions of number and digit. Explain your answer. digit-or-letter>::= | number> ::= |