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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PLEASE DO ANSWER FAST WITH IN 30 MINS
Transcribed Image Text:Extend the BNF in the answer box 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 write e that print the value of the expression e
Notes:
• Tokens must be written in lowercase letters, e.g. if, identifier. (The provided BNF shows non-terminals in a monospaced font, but you do not need to worry about monospacing for your answers.)
• Non-terminals must start with a capital letter, e.g. If, Expression. (The provided BNF shows non-terminals in italics, but you do not need to worry about italics
your answers.)
Answer: (penalty regime: 10, 20, . %)
Program = Statements
Statements = Statement (; Statement)*
Statement = If| While | Assignment
If = if Comparison then Statements else Statements
vend
While = while Comparison do Statements end
Assignment = identifier := Expression
Read =
Write =
Comparison = Expression Relation Expression
Relation = = | != | <|<= | > | >=
Expression = Term ((+| -) Term)*
Term = Factor (* |/) Factor)*
Factor = (Expression) | number | identifier
Check
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