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Semantic rule: .expected_type +.actual_type 2. Syntax rule: → Semantic rule: .actual_type .actual_type Predicate: .actual_type == . expected_type 3. Syntax rule: →+ Semantic rule: .actual_typet.actual_ type Predicate: .actual_type == . expected_type 4. Syntax rule: → Semantic rule: .actual_type .actual_type 5. Syntax rule: → [2] + [3] Semantic rule: actual tne t Svar>121 actual tyne

Semantic rule: .expected_type +.actual_type 2. Syntax rule: → Semantic rule: .actual_type .actual_type Predicate: .actual_type == . expected_type 3. Syntax rule: →+ Semantic rule: .actual_typet.actual_ type Predicate: .actual_type == . expected_type 4. Syntax rule: → Semantic rule: .actual_type .actual_type 5. Syntax rule: → [2] + [3] Semantic rule: actual tne t Svar>121 actual tyne

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. Use the following attribute grammar to answer the questions below. 1. Syntax rule: <assign> → <var>= <expr> Semantic rule: <expr>.expected_type + <var>.actual_type 2. Syntax rule: <expr> →<var> Semantic rule: <expr>.actual_type + <var>.actual_type Predicate: <expr>.actual_type == <expr>. expected_type 3. Syntax rule: <expr> →<var>+ <term> Semantic rule: <expr>.actual_type <term>.actual_type Predicate: <expr>.actual_type == <expr>. expected_type 4. Syntax rule: <term> → <var> Semantic rule: <term>.actual_type + <var>.actual_type 5. Syntax rule: <term> → <var>[2] + <var>[3] Semantic rule: <term>.actual_type + <var>[2].actual_type Predicate: <var>[2].actual_type == <var>[3].actual_type 6. Syntax rule: <var> → A | B | C Semantic rule: <var>.actual_type + look-up(<var>.string) a) Draw a fully attributed parse tree for the sentence C = B+c +A, assuming that A has type real, B has type int, and C has type real. See Figure 3.8 in Sebesta for an example of such a tree. b) According to the attribute grammar, is this sentence valid?
Transcribed Image Text:1. Use the following attribute grammar to answer the questions below. 1. Syntax rule: <assign> → <var>= <expr> Semantic rule: <expr>.expected_type + <var>.actual_type 2. Syntax rule: <expr> →<var> Semantic rule: <expr>.actual_type + <var>.actual_type Predicate: <expr>.actual_type == <expr>. expected_type 3. Syntax rule: <expr> →<var>+ <term> Semantic rule: <expr>.actual_type <term>.actual_type Predicate: <expr>.actual_type == <expr>. expected_type 4. Syntax rule: <term> → <var> Semantic rule: <term>.actual_type + <var>.actual_type 5. Syntax rule: <term> → <var>[2] + <var>[3] Semantic rule: <term>.actual_type + <var>[2].actual_type Predicate: <var>[2].actual_type == <var>[3].actual_type 6. Syntax rule: <var> → A | B | C Semantic rule: <var>.actual_type + look-up(<var>.string) a) Draw a fully attributed parse tree for the sentence C = B+c +A, assuming that A has type real, B has type int, and C has type real. See Figure 3.8 in Sebesta for an example of such a tree. b) According to the attribute grammar, is this sentence valid?
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