CSSE3100/7100 Reasoning About Programs - Semester One 2020- Final Exam - Q5 Dafny Method Single Loop
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QUESTION 5
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Derive a program that satises the specication of the Dafny method, C, where Power is dened as in Question 4. Your program should use a single loop and should not call method B from Question 4.
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The lemma, L, provides a property of Power which may be useful in your derivation. If you use this property add a call to the lemma at the appropriate point in your derived program. There is no need to prove the lemma.
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lemma L(n: nat)
ensures Power(2 * n) == Power(n) * Power(n)
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method C(N: int) returns (y: nat) requires 0 <= N
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ensures y == Power(Power(N))
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