Write a BNF grammar that describes the structure of a nonterminal called . Assume that contains an optional + sign followed by exactly two decimal digits, the first of which cannot be a 0. Thus 23, +91, and +40 are legal, but 9, +01, and 123 are not. Using your grammar from Exercise 5a, show a parse tree for the value +90.

Write a BNF grammar that describes the structure of a nonterminal called . Assume that contains an optional + sign followed by exactly two decimal digits, the first of which cannot be a 0. Thus 23, +91, and +40 are legal, but 9, +01, and 123 are not. Using your grammar from Exercise 5a, show a parse tree for the value +90.

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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