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Question- Describe an algorithm that uses only assignment statements that replaces (x, y, z) with (y, z, x). What is the minimum number of assignment statements needed?

By solutions, the answer is like that.
a:=x, b:=y, c:=z, x:=y, y:=z, z:=x, y:=a, z:=b, x:=c
Then it needs minimum nine assignment statement.
(It's problem of 12E of Chapter 3.1, DIscrete Mathematics and its applications 7th edition).

But I don't understand. It seems that it's just four. Because, I think that a:=x, x:=y, y:=z, z:=a can be a solution. Especially I don't understand last three statements. Why am I need them? If it is wrong, what's the wrong point?

Please Explain don't just write the answer.

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Computer Engineering, Engineering

Category:- Computer Engineering
Reference No.:- M91174986

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