Modify the extended BNF (EBNF) 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 į 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 EBNF shows terminals in a monospaced font, but you do not need to worry about monospacing for your answer Non-terminals must start with a capital letter, e.g. If, Expression. (The provided EBNF shows non-terminals in italics, but you do not need to worry about italics for your answers.) Program = Statements Statements Statement (; Statement)* Statement = If | While | Assignment If = if Comparison then Statements --Choose-- While = while Comparison do Statements end Assignment = identifier := Expression Read = Write = Comparison = Expression Relation Expression Relation ==| != | < | <=| > | >= Expression = Term ((+1-) Term)* Term Factor ((* | /) Factor)* Factor= (Expression) | number | identifier end ✓ --Choose-- else Statements (else Statements) [else Statements] else Statements* (else Statements)* else Statements+ (else Statements)+
Modify the extended BNF (EBNF) 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 į 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 EBNF shows terminals in a monospaced font, but you do not need to worry about monospacing for your answer Non-terminals must start with a capital letter, e.g. If, Expression. (The provided EBNF shows non-terminals in italics, but you do not need to worry about italics for your answers.) Program = Statements Statements Statement (; Statement)* Statement = If | While | Assignment If = if Comparison then Statements --Choose-- While = while Comparison do Statements end Assignment = identifier := Expression Read = Write = Comparison = Expression Relation Expression Relation ==| != | < | <=| > | >= Expression = Term ((+1-) Term)* Term Factor ((* | /) Factor)* Factor= (Expression) | number | identifier end ✓ --Choose-- else Statements (else Statements) [else Statements] else Statements* (else Statements)* else Statements+ (else Statements)+
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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Question
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![Modify the extended BNF (EBNF) 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 į 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
EBNF shows 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
EBNF shows non-terminals in italics, but you do not need to worry about italics
for your answers.)
Program = Statements
Statements = Statement (; Statement)*
Statement = If | While | Assignment
If = if Comparison then Statements |--Choose--
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
✓end
✓ --Choose--
else Statements
(else Statements)
[else Statements]
else Statements*
(else Statements)*
else Statements+
(else Statements)+](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F09c2f836-a777-444b-9271-94b360db7692%2Fbbf59bfe-bd22-4fa0-8375-46e19b06dbe1%2Fylhj9vn_processed.png&w=3840&q=75)
Transcribed Image Text:Modify the extended BNF (EBNF) 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 į 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
EBNF shows 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
EBNF shows non-terminals in italics, but you do not need to worry about italics
for your answers.)
Program = Statements
Statements = Statement (; Statement)*
Statement = If | While | Assignment
If = if Comparison then Statements |--Choose--
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
✓end
✓ --Choose--
else Statements
(else Statements)
[else Statements]
else Statements*
(else Statements)*
else Statements+
(else Statements)+
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