# Project #86622 - JavaSE

Assignment 5 (40 points)

Question 1

Write static methods as follows:

â€¢ double sum(double[] a) â€“ returns the sum of the entries in the array a.

â€¢ double[] fill(int n, double v) â€“ returns an array of n doubles, all of whose values are v.

â€¢ double[] random (int n) â€“ return an array of n random doubles.

â€¢ double min(double[] a) â€“ returns the minimum element of the array a.

â€¢ double max(double[] a) â€“ returns the maximum element of the array a.

â€¢ double average(double[] a) â€“ returns the average (or mean) of the elements of the array a.

â€¢ double variance(double[] a) â€“ returns the variance of the elements of the array a (note: this

method should call your average method).

â€¢ double stdDev(double[] a) â€“ returns the standard deviation of the elements of the array a (note:

this method should call your variance method).

â€¢ double[] read() â€“ reads an array from the keyboard and returns it (read the number of elements

first, and then that many numbers).

â€¢ void print(double[] a) â€“ prints an array, a, on a single line with commas between elements (do

NOT use Arrays.toString()).

Write a Main class with a main method that tests your methods appropriately (i.e. by calling each

method at least once with various inputs), and printing the results.

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Question 2

Consider the following method and method call:

public static int[] inc(int[] a) {

a[0]++;

return a;

}

int[] a = { 10, 20, 30, 40 };

System.out.println(a[0]);

int[] b = inc(a);

System.out.println(b[0]);

System.out.println(a[0]);

What is the output from this code? Carefully explain your answer (i.e. carefully show how the method

inc is called).

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Question 3

Consider the following code:

int[] a = { 10, 20, 30, 40 };

int[] b = a;

int[] c = { 10, 20, 30, 40 };

System.out.println(a == b);

System.out.println(a == c);

What is the output from this code? Carefully explain your answer.

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 Subject Computer Due By (Pacific Time) 10/14/2015 07:00 am
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