Solved: Exercises 6–9 each contain a while loop annotated
Chapter 5, Problem 7E(choose chapter or problem)
Problem 7E
Exercises 6–9 each contain a while loop annotated with a preand a post-condition and also a loop invariant. In each case, use the loop invariant theorem to prove the correctness of the loop with respect to the pre- and post-conditions.
[Pre-condition: largest = A[1] and i = 1]
while ( i ≠ m)
1. i := i + 1
2. ifA[i ] > largest then largest := A[i ]
end while
[Post-condition: largest = maximum value of A[1], A[2], . . . , A[m]]
loop invariant: I (n) is “largest = maximum value of A[1], A[2], . . . , A[n + 1] and i = n + 1.”
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