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)
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)
Chapter2: Using Data
Section: Chapter Questions
Problem 1GZ
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x: 3,6,9,12,15,18.......
y: 12,24,36,48,60....
z: 1,2,3,4,5,6,7,8.....
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