Extend the BNF in the answer bax below to include: 1. if-then-else-end statements (in addition to the if-then statements it already includes) 2. read statements of the form read i that reads a value and stores it in the variable with identifier i 3. write statements of the form urite e that print the value of the expression e Notes: • Tokens must be written in lowercase letters, eg. if, identifier. (The provided BNF shows non-terminals in a nonospaced font, but you do not need to worry about monospacing for your answers.) • Non-terminals must start with a capital letter, eg. If, Expression. (The provided BNF shows non-terminals in italics, but you do not need to worry about italics for your answers) Answer: (penalty regime: 10, 20. %) Program = Statements Statements = Stotement (; Stotement)" Statement = If| While | Assignment If = 1f Comparison then Statements else Statements v end While = while Comparison do Statements end Assignment = identifier Expression Read = Write = Comparison = Expression Relation Expression Relation =| l|<||>|> Expression = Term ((-|-) Term)" Term = Factor (*|) Foctor) Foctor = (Expression) | nunber | identifier Check

Extend the BNF in the answer bax below to include: 1. if-then-else-end statements (in addition to the if-then statements it already includes) 2. read statements of the form read i that reads a value and stores it in the variable with identifier i 3. write statements of the form urite e that print the value of the expression e Notes: • Tokens must be written in lowercase letters, eg. if, identifier. (The provided BNF shows non-terminals in a nonospaced font, but you do not need to worry about monospacing for your answers.) • Non-terminals must start with a capital letter, eg. If, Expression. (The provided BNF shows non-terminals in italics, but you do not need to worry about italics for your answers) Answer: (penalty regime: 10, 20. %) Program = Statements Statements = Stotement (; Stotement)" Statement = If| While | Assignment If = 1f Comparison then Statements else Statements v end While = while Comparison do Statements end Assignment = identifier Expression Read = Write = Comparison = Expression Relation Expression Relation =| l|<||>|> Expression = Term ((-|-) Term)" Term = Factor (*|) Foctor) Foctor = (Expression) | nunber | identifier Check

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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