2. Syntax rule: → Semantic rule: .actual_type .actual_type Predicate: .actual_type == . expected_type 3. Syntax rule: → + Semantic rule: .actual_type – .actual_type Predicate: .actual_type == . expected_type 4. Syntax rule: → Semantic rule: .actual_type .actual_type 5. Syntax rule: [2] + [3] Semantic rule: .actual_type [2] .actual_type Predicate: [2] .actual_type == [3] .actual_type 6. Syntax rule: → A |B|C Semantic rule: .actual_type – look-up ( .string) Answer the following questions according to the grammar rules specified. a. Create the parser tree structure for the C = B +C +A sentence. b. Is this a correct sentence according to this grammar?

2. Syntax rule: → Semantic rule: .actual_type .actual_type Predicate: .actual_type == . expected_type 3. Syntax rule: → + Semantic rule: .actual_type – .actual_type Predicate: .actual_type == . expected_type 4. Syntax rule: → Semantic rule: .actual_type .actual_type 5. Syntax rule: [2] + [3] Semantic rule: .actual_type [2] .actual_type Predicate: [2] .actual_type == [3] .actual_type 6. Syntax rule: → A |B|C Semantic rule: .actual_type – look-up ( .string) Answer the following questions according to the grammar rules specified. a. Create the parser tree structure for the C = B +C +A sentence. b. Is this a correct sentence according to this grammar?

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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question 3:1. 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|CSemantic rule: <var>.actual_type ¬ look-up(<var>.string) Answer the following questions according to the grammatical rules specified. a. Create…
9. It is required to write a parser for the grammar below. <source_file> ::= <declarations> <code> <declarations> ::= vars <list_of_variables> ; <list_of_variables> ::= <variable> | <list_of_variables> , <variable> <code> ::= <statements> . <statements> ::= <assignment> | <statements> ; <assignment> <assignment> ::= <variable> := <expression> <expression> ::= <expression> + <term> | <expression> - <term> | <term> <term> ::= <term> * <factor> | <term> / <factor> | <factor> <factor> ::= <number> | <variable>
Using the sample grammar below, derive the following syntax and create a parse tree using the leftmost derivation method. Sample Grammar<program> → <stmts><stmts> <stmt> | <stmt>; <stmts><stmt>→ <expr><expr>→<term> | <expr> + <term> | <expr> - <term><term>→<element> | <term> * <element> | <term> / <element><element>→<var> | (<expr>)<var>→x | y | z |a |b |c x + y * z ; a - b / c Will need help with the (1) Syntax Derivation and (2) Parse Tree. Thank you!
In Pig, emphasize the distinction between group and Cogroup operators.
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4. What is the advantage and disadvantage for interpretation? Ans: 5. Please demonstrate abstract syntax and concrete syntax for "3+5 ". Ans:
Question 2 : Given the following context-free grammar stmt: if then | if_then_else | other_stmts if_then : IF condition THEN stmt if_then_else : IF condition THEN stmt ELSE stmt You may assume that nonterminal other_stmts and condition have already been defined. 1. Show that this context-free grammar is ambiguous. 2. Rewrite the grammar so that it is not ambiguous, but still accepts the same language
1. a) Design a context free grammar for the following language. L = { 0*1" |m,n >=0, n !=m }
Construct context-free grammar. {a^x b^y | 3x <= 5y <= 4x, x,y > 0}
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Productions Semantic RulesS --> L . R L.pos = 0; R.pos = -1; S.val = L.val + R.valS --> L L.pos = 0; S.val = L.val;L --> L1 B L1.pos = L.pos + 1; B.pos = L.pos; L.val = L1.val + B.val;L --> B B.pos = L.pos; L.val = B.val;R --> R1 B R1.pos = R.pos - 1; B.pos = R.pos; L.val = L1.val + B.val;R --> B B.pos = R.pos; L.val = B.val;B --> 0 B.val = 0;B --> 1 B.val = 1*2B.pos; Create an annotated parse tree for the following input strings: b) 010.1111
In attributed grammars what is an attribute computation function? A function associated with a production rule used to compute the value of an attribute. A function associated with a production used to check the value of an attribute. A function associated with a symbol used to check the value of an attribute. A function associated with a symbol used to compute the value of an attribute.