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A). Compute the weakest precondition for the following assignment statement and postcondition: x = 2 * y + x - 1 {x > 11} B). Compute the weakest precondition for the following selection construct and its postcondition: if (x < y) x = x + 1 else x = 3 * x {x < 0}

A). Compute the weakest precondition for the following assignment statement and postcondition: x = 2 * y + x - 1 {x > 11} B). Compute the weakest precondition for the following selection construct and its postcondition: if (x < y) x = x + 1 else x = 3 * x {x < 0}

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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A). Compute the weakest precondition for the following assignment statement and postcondition:

x = 2 * y + x - 1 {x > 11}

B). Compute the weakest precondition for the following selection construct and its postcondition:

if (x < y)

x = x + 1

else

x = 3 * x

{x < 0}

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