(a) Consider the following algorithm. Input: A non-negative integer n. (1) If n % 5 = 0, stop. Otherwise, go to (2). (2) Replace n by n + 3, and go back to (1). Prove that this algorithm terminates for every choice of the input n. 2.

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
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2. (a) Consider the following algorithm.
Input: A non-negative integer n.
(1) If n % 5 = 0, stop. Otherwise, go to (2).
(2) Replace n by n +3, and go back to (1).
Prove that this algorithm terminates for every choice of the input n.
(b) Consider the following algorithm, in which
f(n) = n – 7n² + 14n – 8.
Input: An integer n.
(1) If f(n) = 0, stop. Otherwise, go to (2).
(2) Replace n by n² % 7 and go back to (1).
Prove that this algorithm terminates if and only if n is not a multiple of 7.
Transcribed Image Text:2. (a) Consider the following algorithm. Input: A non-negative integer n. (1) If n % 5 = 0, stop. Otherwise, go to (2). (2) Replace n by n +3, and go back to (1). Prove that this algorithm terminates for every choice of the input n. (b) Consider the following algorithm, in which f(n) = n – 7n² + 14n – 8. Input: An integer n. (1) If f(n) = 0, stop. Otherwise, go to (2). (2) Replace n by n² % 7 and go back to (1). Prove that this algorithm terminates if and only if n is not a multiple of 7.
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