Computer Science: An Overview: Global Edition (12th Edition)

Published by Pearson Higher Education
ISBN 10: 1292061162
ISBN 13: 978-1-29206-116-0

Chapter 2 - Data Manipulation - Section 2.3 - Program Execution - Questions & Exercises - Page 110: 4

Answer

$It\ halts$. This is an example of what is often called a self-modifying code. That is, the program modifies itself. Note that the first two instructions place hexadecimal $C0$ at memory location $F8$, and the next two instructions place $00$ at location $F9$. Thus, by the time the machine reaches the instruction at $F8$, the halt instruction $(C000)$ has been placed there.

Work Step by Step

$It\ halts$. This is an example of what is often called a self-modifying code. That is, the program modifies itself. Note that the first two instructions place hexadecimal $C0$ at memory location $F8$, and the next two instructions place $00$ at location $F9$. Thus, by the time the machine reaches the instruction at $F8$, the halt instruction $(C000)$ has been placed there.
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