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Suppose there are three variables X, Y and Z with these types: X: integer that is divisible by 2 Y: integer that is divisible by 4 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 running the program whether the assignment is safe? Why or why not? a. X: Y b. X: = Z C. Y: Y + 1

Suppose there are three variables X, Y and Z with these types: X: integer that is divisible by 2 Y: integer that is divisible by 4 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 running the program whether the assignment is safe? Why or why not? a. X: Y b. X: = Z C. Y: Y + 1

Database System Concepts
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
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Suppose there are three variables X, Y and Z with these types: X: integer that is divisible by 2 Y: integer that is divisible by 4 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 running the program whether the assignment is safe? Why or why not? a. X: = Y b. X: = Z c. Y :=Y + 1
Transcribed Image Text:Suppose there are three variables X, Y and Z with these types: X: integer that is divisible by 2 Y: integer that is divisible by 4 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 running the program whether the assignment is safe? Why or why not? a. X: = Y b. X: = Z c. Y :=Y + 1
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