Implement, using only the Queue kernel methods, the static method declared as follows and answer the questions below: Reports the smallest integer in the given {@code Queue). @param q the queue of integer @return the smallest integer in the given queue @requires q /= empty_string @ensures min is in entries (q) and for all x: integer where (x is in entries (q)) (min <= x) ivate static int min (Queue q) {...} i. Why do you need the requires clause? ii. Why is the first line of the ensures clause important (min is in entries (q))? Explain what the implementation could do if this line was not included in the postcondition.

C++ Programming: From Problem Analysis to Program Design
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ISBN:9781337102087
Author:D. S. Malik
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Chapter18: Stacks And Queues
Section: Chapter Questions
Problem 16PE: The implementation of a queue in an array, as given in this chapter, uses the variable count to...
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1. Implement, using only the Queue kernel methods, the static method declared as follows and
answer the questions below:
Reports the smallest integer in the given {@code Queue<Integer>}.
@param q
the queue of integer
@return the smallest integer in the given queue
@requires q /= empty_string
@ensures <pre>
min is in entries (q) and
for all x: integer
where (x is in entries (q))
(min <= x)
</pre>
ivate static int min (Queue<Integer> q) {...}
i. Why do you need the requires clause?
ii. Why is the first line of the ensures clause important (min is in entries (q))?
Explain what the implementation could do if this line was not included in the
postcondition.
2. Implement the static method declared as follows:
Reports an array of two {@code int}s with the smallest and the
* largest integer in the given {@ code Queue<Integer>}.
* @param q
the queue of integer
@return an array of two (@code int}s with the smallest and the
largest integer in the given queue
* @requires q /= empty_string
@ensures <pre>
{ minAndMax [0], minAndMax [1] } is subset of entries (q) and
for all x: integer
where (x in in entries (q))
(minAndMax [0] <= x <= minAndMax [1])
* </pre>
* /
private static int [] minAndMax (Queue<Integer> q) {...}
Note that because in Java a function can return only one value and it is not possible to
return other values through the parameters, we are forced to return an array with the
minimum and maximum integers of the given queue as elements.
3. Consider the minAndMax operation again. Write a second implementation for this operation
that uses the "Noah's Ark" algorithm. This algorithm takes entries from q in pairs, first
comparing them to each other, then comparing the smaller of the pair to the minimum so far
and the larger of the pair to the maximum so far.
Transcribed Image Text:1. Implement, using only the Queue kernel methods, the static method declared as follows and answer the questions below: Reports the smallest integer in the given {@code Queue<Integer>}. @param q the queue of integer @return the smallest integer in the given queue @requires q /= empty_string @ensures <pre> min is in entries (q) and for all x: integer where (x is in entries (q)) (min <= x) </pre> ivate static int min (Queue<Integer> q) {...} i. Why do you need the requires clause? ii. Why is the first line of the ensures clause important (min is in entries (q))? Explain what the implementation could do if this line was not included in the postcondition. 2. Implement the static method declared as follows: Reports an array of two {@code int}s with the smallest and the * largest integer in the given {@ code Queue<Integer>}. * @param q the queue of integer @return an array of two (@code int}s with the smallest and the largest integer in the given queue * @requires q /= empty_string @ensures <pre> { minAndMax [0], minAndMax [1] } is subset of entries (q) and for all x: integer where (x in in entries (q)) (minAndMax [0] <= x <= minAndMax [1]) * </pre> * / private static int [] minAndMax (Queue<Integer> q) {...} Note that because in Java a function can return only one value and it is not possible to return other values through the parameters, we are forced to return an array with the minimum and maximum integers of the given queue as elements. 3. Consider the minAndMax operation again. Write a second implementation for this operation that uses the "Noah's Ark" algorithm. This algorithm takes entries from q in pairs, first comparing them to each other, then comparing the smaller of the pair to the minimum so far and the larger of the pair to the maximum so far.
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