W = x; if (m > 0) // node 1 { W++; // node 2 } else { w=2*w; // node 3 } //node 4 (no executable statement) if (y <= 10) { x = 5*y; // node 5 } else { x=3y+5; //node 6 } z = W + x; // node 7
W = x; if (m > 0) // node 1 { W++; // node 2 } else { w=2*w; // node 3 } //node 4 (no executable statement) if (y <= 10) { x = 5*y; // node 5 } else { x=3y+5; //node 6 } z = W + x; // node 7
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
Related questions
Question
Use the following
(a) Draw a control flow graph for this program fragment. Use the
node numbers given above.
(b) Which nodes have defs for variable w?
(c) Which nodes have uses for variable w?
(d) Are there any du-paths with respect to variable w from node 1 to
node 7? If not, explain why not. If any exist, show one.
(e) List all of the du-paths for variables w and x.
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