a. ab- b. a * 1 + c (b - 1) / c mod d b) / c & (d * e/ a - 3) and e c. (a d. -a or c = d - e. a> b xor c or d <= 17 f. -a + b
a. ab- b. a * 1 + c (b - 1) / c mod d b) / c & (d * e/ a - 3) and e c. (a d. -a or c = d - e. a> b xor c or d <= 17 f. -a + b
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
Solve problem 9

Transcribed Image Text:9. Assume the following rules of associativity and precedence for expressions:
Highest
Precedence
a + b c + d
Associativity
Show the order of evaluation of the following expressions by parenthe-
sizing all subexpressions and placing a superscript on the right parenthe-
sis to indicate order. For example, for the expression
a. a * b - 1 + c
*
b. a
c. (a b) / c
d. -a or c =
Lowest
Left to right
-
the order of evaluation would be represented as
((a + (b * c) ¹)² + d) ³
(b - 1) / c mod d
e. a> b xor c
f. -a + b
*, /, not
+, -, &, mod
- (unary)
= , /=, <, <=, >=, >
and
or, xor
& (d * e/ a - 3)
d and e
or d <= 17
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