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1. Define syntax and semantics. 2. Explain briefly the three methods of describing semantics. 3. Using the following grammar show a parse tree and a leftmost derivation for the statement: x = x * (y + (z * x)) Grammar: → = %3D - x | y |z + | * |( ) |

1. Define syntax and semantics. 2. Explain briefly the three methods of describing semantics. 3. Using the following grammar show a parse tree and a leftmost derivation for the statement: x = x * (y + (z * x)) Grammar: → = %3D - x | y |z + | * |( ) |

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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1. Define syntax and semantics. 2. Explain briefly the three methods of describing semantics. 3. Using the following grammar show a parse tree and a leftmost derivation for the statement: X = x * (у + (z * х)) Grammar: <assign> <var> = <expr> <var> - x | y | z <expr> <var> + <expr> | <var> * <expr> |( <expr> ) | <var> 4. Using the following grammar show a parse tree and a leftmost derivation for the statement: A = ( A + B ) * C Grammar: <assign> + <var> = <expr> <var> - A | B | C <еxpr> <expr> + <term> | <term> <term> - <term> * <factor> | <factor> ( <expr> ) <factor> | <var>
Transcribed Image Text:1. Define syntax and semantics. 2. Explain briefly the three methods of describing semantics. 3. Using the following grammar show a parse tree and a leftmost derivation for the statement: X = x * (у + (z * х)) Grammar: <assign> <var> = <expr> <var> - x | y | z <expr> <var> + <expr> | <var> * <expr> |( <expr> ) | <var> 4. Using the following grammar show a parse tree and a leftmost derivation for the statement: A = ( A + B ) * C Grammar: <assign> + <var> = <expr> <var> - A | B | C <еxpr> <expr> + <term> | <term> <term> - <term> * <factor> | <factor> ( <expr> ) <factor> | <var>
5. Prove that the following grammar is ambiguous: < start > → <A> <A> → <A> + <A> [ <id> <id> → a | b| C 6. Describe, in English, the language defined by the following grammar: <start> - <A> <B> <C> <А> — а <А> | а <B> → b <B>| b <C> → c <C> | C 7. Which of the following sentences are in the language generated by this grammar? а. baab b. bbbab С. bbaaaaa d. bbaab 8. Write a grammar for the language consisting of strings that have n copies of the letter a followed by twice the number of copies of the letter b, where n > 0. For example, the strings abb, aaabbbbbb, and aaaabbbbbbbb are in the language but ab, aabb, ba, and aaabb are not.
Transcribed Image Text:5. Prove that the following grammar is ambiguous: < start > → <A> <A> → <A> + <A> [ <id> <id> → a | b| C 6. Describe, in English, the language defined by the following grammar: <start> - <A> <B> <C> <А> — а <А> | а <B> → b <B>| b <C> → c <C> | C 7. Which of the following sentences are in the language generated by this grammar? а. baab b. bbbab С. bbaaaaa d. bbaab 8. Write a grammar for the language consisting of strings that have n copies of the letter a followed by twice the number of copies of the letter b, where n > 0. For example, the strings abb, aaabbbbbb, and aaaabbbbbbbb are in the language but ab, aabb, ba, and aaabb are not.
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