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=2w; // node 3 } //node 4 (no executable statement) if (y <= 10) { x = 5y; // 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

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Question

Use the following program fragment for questions a–e:

(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.

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

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