3. Add all the intermediate assertions and so produce the proof tableau for the following state- ments. If a statement is not valid then include in your respective tableau a pre-condition that is just strong enough to make the statement valid. (a) ASSERT (true) m = 1; n = 1%; n = a-b; ASSERT (m*n > 0) (b) ASSERT (x == y*(y+1)) y = y + 1; x = x + 2*y; ASSERT (x == = y*(y+1)) (c) ASSERT (false) y = 1; ASSERT (x+y<=0) 1 (d) ASSERT (true) if (x >= y) x = x + 1; else y = x - 1; z = y 1; ASSERT (z < y < x)

3. Add all the intermediate assertions and so produce the proof tableau for the following state- ments. If a statement is not valid then include in your respective tableau a pre-condition that is just strong enough to make the statement valid. (a) ASSERT (true) m = 1; n = 1%; n = a-b; ASSERT (mn > 0) (b) ASSERT (x == y(y+1)) y = y + 1; x = x + 2y; ASSERT (x == = y(y+1)) (c) ASSERT (false) y = 1; ASSERT (x+y<=0) 1 (d) ASSERT (true) if (x >= y) x = x + 1; else y = x - 1; z = y 1; ASSERT (z < y < x)

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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