Exercise 4 Suppose there are three variables X, Y, and Z with these types: X: integer that is divisible by 3 Y: integer that is divisible by 12 Z: integer For each of the following assignments, knowing nothing about the values of the variables except their types, answer whether a language system can tell before run- ning the program whether the assignment is safe? Why or why not? a. X = Y b. X = X c. Y := y + 1 d. Z : = X e. X : = Z f. X = X + 3 8. X : = X + Y

Computer Networking: A Top-Down Approach (7th Edition)
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ISBN:9780133594140
Author:James Kurose, Keith Ross
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Chapter1: Computer Networks And The Internet
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Exercise 4 Suppose there are three variables X, Y, and Z with these types:
X: integer that is divisible by 3
Y: integer that is divisible by 12
Z: integer
For each of the following assignments, knowing nothing about the values of the
variables except their types, answer whether a language system can tell before run-
ning the program whether the assignment is safe? Why or why not?
a. X = Y
b. X = X
c. Y := y + 1
d. Z
: = X
e. X : = Z
f. X = X + 3
g. X = X + Y
You need to work on part (d - g) following the examples in part (a- c)
Transcribed Image Text:Exercise 4 Suppose there are three variables X, Y, and Z with these types: X: integer that is divisible by 3 Y: integer that is divisible by 12 Z: integer For each of the following assignments, knowing nothing about the values of the variables except their types, answer whether a language system can tell before run- ning the program whether the assignment is safe? Why or why not? a. X = Y b. X = X c. Y := y + 1 d. Z : = X e. X : = Z f. X = X + 3 g. X = X + Y You need to work on part (d - g) following the examples in part (a- c)
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