Use a loop invariant to prove that the following program
Chapter 8, Problem 7E(choose chapter or problem)
Problem 7E
Use a loop invariant to prove that the following program segment for computing the nth power, where n is a positive integer, of a real number x is correct. power:= 1
i:= 1
while i≤ n
power:= power * x
i:= i + 1
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