`ann.math.DoubleArrays`

DoubleArrays.java is a module that defines classwide operations
for arrays of double values.

### public static double [] readArray()

*Read values from the Keyboard into an array*
Precondition: Keyboard contains an int n, followed by n double
values.

Input: the values from Keyboard

Return: the n input values in a double array

### public static double sum(double [] array)

*Sum the values in an array of doubles*
Receive: double [] array

Return: the sum of the values in array

### public static double average(double [] array)

*Find the average of the values in an array of
doubles*
Receive: double [] array

Precondition: array.length > 0.

Return: the average of the values in array

### public static boolean equals(double [] a1, double
[] a2)

*Check two arrays for equality*
Receive: double [] a1, double [] a2

Return: true iff a1 and a2 contain exactly the same
elements

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