Recursive descent is a top-down parsing technique that reads the inputs from left to right. Given the following grammar, choose the derivation that is a valid recursive descent parsing for the input string: int + int   E → E’ | E’ + E E’ → -E’ | int | (E) Group of answer choices 1- E =>        E’        E’ + E        int + E        int + E’

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
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Recursive descent is a top-down parsing technique that reads the inputs from left to right. Given the following grammar, choose the derivation that is a valid recursive descent parsing for the input string: int + int

 

E → E’ | E’ + E

E’ → -E’ | int | (E)

Group of answer choices

1- E =>

       E’

       E’ + E

       int + E

       int + E’

       int + int

 

2- E =>

       E’

      -E’

      int

      (E)

      E’ + E

      -E’ + E

      int + E

      int + E’

      int + -E’

      int + int

 

3- E =>

      E’ + E

      int + E

      int + E’

      int + int

 

4- E =>

       E’

       int

       E’ + E

       int + E

       int + E’

       int + int

 

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