Compute the weakest preconditio following assignment statements postconditions: a. a = 2 * (b - 1) - 1 {a > 0} b. b = (c + 10) / 3 {b > 6} %3D c. a = a + 2 * b - 1 {a > 1}

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
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Compute the weakest precondition for each of the
following assignment statements and their
postconditions:
a = 2 * (b - 1)
1 {a > 0}
а.
b.
b =
(c + 10) / 3 {b > 6}
a = a + 2 * b
1 {a > 1}
C.
d.
X = 2 *
y + x
- 1 {x > 11}
Transcribed Image Text:Compute the weakest precondition for each of the following assignment statements and their postconditions: a = 2 * (b - 1) 1 {a > 0} а. b. b = (c + 10) / 3 {b > 6} a = a + 2 * b 1 {a > 1} C. d. X = 2 * y + x - 1 {x > 11}
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