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low(S) Follow(A) Follow(B) Follow(C) Follow(D)

low(S) Follow(A) Follow(B) Follow(C) Follow(D)

Database System Concepts
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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Your Question:

I always get the wrong answer for these three, can you please provide me the correct answer for

Follow(S)

Follow(A)

Follow(B)

Follow(C)

Follow(D)

(Please see the picture as well)

Consider the context-free grammar below that generates mathematical expressions (it uses "a" as a placeholder for where values would go). S' → S$ S→ BA A → +BA|-BA|X B → DC C→ *DC/DC | X D→al (S) The non-terminals in this grammar are S, S, A, B, C, and D. The terminals are a, +, -, *, /, (,), and $. For grading purposes, list terminals in your answers in the following order: a+-*/()$ In each of the following questions list your set in the order given above. If a set is empty write exactly the word empty. Separate items using commas and no spaces. For example: a,-./.) What is in First(S)? { What is in First(A)? [ What is in First(B)? { What is in First(C)? { What is in First(D)? { IIII What is in Follow(S)? { $ What is in Follow(A)? { What is in Follow(B)? {+-A What is in Follow(C)? { $ What is in Follow(D)? { +,-.A *./,^
Transcribed Image Text:Consider the context-free grammar below that generates mathematical expressions (it uses "a" as a placeholder for where values would go). S' → S$ S→ BA A → +BA|-BA|X B → DC C→ *DC/DC | X D→al (S) The non-terminals in this grammar are S, S, A, B, C, and D. The terminals are a, +, -, *, /, (,), and $. For grading purposes, list terminals in your answers in the following order: a+-*/()$ In each of the following questions list your set in the order given above. If a set is empty write exactly the word empty. Separate items using commas and no spaces. For example: a,-./.) What is in First(S)? { What is in First(A)? [ What is in First(B)? { What is in First(C)? { What is in First(D)? { IIII What is in Follow(S)? { $ What is in Follow(A)? { What is in Follow(B)? {+-A What is in Follow(C)? { $ What is in Follow(D)? { +,-.A *./,^
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