Programming in PROL. Consider the following PROL program: edge(X, Y) ⇐ X = a, Y = b edge(X, Y) ⇐ X = b, Y = a edge(X, Y) ⇐ X = c, Y = c reachable(X, Y) ⇐ X = Y
Programming in PROL. Consider the following PROL program: edge(X, Y) ⇐ X = a, Y = b edge(X, Y) ⇐ X = b, Y = a edge(X, Y) ⇐ X = c, Y = c reachable(X, Y) ⇐ X = Y
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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2.
edge(X, Y) ⇐ X = a, Y = b
edge(X, Y) ⇐ X = b, Y = a
edge(X, Y) ⇐ X = c, Y = c
reachable(X, Y) ⇐ X = Y
reachable(X, Y) ⇐ edge(X, Z), reachable(Z, Y)
⇐ reachable(a, c)
How does this program behave when executed? Explain its behavior.
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