Computers and Technology, 21.09.2019 17:30 ethanseiter

Under which of the following conditions will evaluating this boolean expression
cause an n represents the length of a?
((i < = n) & & (a[i] == 0)) || > = n) & & (a[i-1] ==
i. i > n
ii. i = n
iii. i < n
i only
ii only
i and ii only
ii and iii only
none of the above cause
couple more just the ones im stuck on d:

Answers: 1

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Answers

1.)
((i <= n) && (a[i] == 0)) || (((i >= n) && (a[i-1] == 0)))

The expression will be true IF the first part is true, or if the first part is false and the second part is true. This is because || uses "short circuit" evaluation. If the first term is true, then the second term is *never even evaluated*.

For || the expression is true if *either* part is true, and for && the expression is true only if *both* parts are true.

a.) (i <= n) || (i >= n)

This means that either, or both, of these terms is true. This isn't sufficient to make the original term true.

b.) (a[i] == 0) && (a[i-1] == 0)

This means that both of these terms are true. We substitute.

((i <= n) && true) || (((i >= n) && true))

Remember that && is true only if both parts are true. So if you have x && true, then the truth depends entirely on x. Thus x && true is the same as just x. The above predicate reduces to:

(i <= n) || (i >= n)

This is clearly always true.

Answer from: Quest

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Answer from: Quest

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