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a) a * b- 1 + c c) (a-b)/c & (d*e/a-3) e) a>b xor c or d<= 17 12) using the grammar of problem 11, draw parse trees for the expressions in question 9 (a and c only) referencing 11) write a BNF grammar for the precedence and associativity rules for problem 9. assume only operands are a,b,c,d and e; BNF: ADD RULES TO COMPLETE THE GRAMMAR S SS | not S | S*S | S/S | O|T|I|N O--> alb|cd|e T--> S+SI ...etc etc etc... N--> -S I--> 0...9 | II specifically: a*e+c S--> S*S --> O*S --> O*T --> O*S+S --> 0*0+0 --> a*e+c

a) a * b- 1 + c c) (a-b)/c & (d*e/a-3) e) a>b xor c or d<= 17 12) using the grammar of problem 11, draw parse trees for the expressions in question 9 (a and c only) referencing 11) write a BNF grammar for the precedence and associativity rules for problem 9. assume only operands are a,b,c,d and e; BNF: ADD RULES TO COMPLETE THE GRAMMAR S SS | not S | S*S | S/S | O|T|I|N O--> alb|cd|e T--> S+SI ...etc etc etc... N--> -S I--> 0...9 | II specifically: a*e+c S--> S*S --> O*S --> O*T --> O*S+S --> 0*0+0 --> a*e+c

Database System Concepts
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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Expressions in question 9 are a,c,e at the very top. Here are the precedence and associativity rules for question 9. Goal is to find the answer to number 12!
9. Assume the following rules of associativity and precedence for expressions: Highest Precedence Associativity Lowest Left to right *, /, not +, -, &, mod - (unary) =, /=, <, < =, >=, > and or, xor
Transcribed Image Text:9. Assume the following rules of associativity and precedence for expressions: Highest Precedence Associativity Lowest Left to right *, /, not +, -, &, mod - (unary) =, /=, <, < =, >=, > and or, xor
a) a * b- 1 + c c) (a-b)/c & (d*e/a-3) e) a>b xor c or d<= 17 12) using the grammar of problem 11, draw parse trees for the expressions in question 9 (a and c only) referencing 11) write a BNF grammar for the precedence and associativity rules for problem 9. assume only operands are a,b,c,d and e; BNF: ADD RULES TO COMPLETE THE GRAMMAR S --> SS | not S | S*S | S/S | O|T|I|N O--> alb|cd|e T--> S+S|...etc etc etc... N--> -S 1--> 0...9 | 11 specifically: a*e+c S--> S*S --> O*S --> O*T --> O*S+S --> 0*0+0 --> a*e+c
Transcribed Image Text:a) a * b- 1 + c c) (a-b)/c & (d*e/a-3) e) a>b xor c or d<= 17 12) using the grammar of problem 11, draw parse trees for the expressions in question 9 (a and c only) referencing 11) write a BNF grammar for the precedence and associativity rules for problem 9. assume only operands are a,b,c,d and e; BNF: ADD RULES TO COMPLETE THE GRAMMAR S --> SS | not S | S*S | S/S | O|T|I|N O--> alb|cd|e T--> S+S|...etc etc etc... N--> -S 1--> 0...9 | 11 specifically: a*e+c S--> S*S --> O*S --> O*T --> O*S+S --> 0*0+0 --> a*e+c
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