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## Array algorithms practice

You will often get questions from me in the form: Write an algorithm that takes [argument(s)] and returns [return value]. In your Paper 1, you may be asked to do this in pseudocode, and you will need to be able to do this. However, I like you to be able to test your algorithms by running them, hence I will ask you to implement them in Java. Below is a template for an ArrayAlgorithms class, that you can copy into Netbeans, and then use to test out your algorithms.

- Write an algorithm
**print**that takes an array of integers and prints them out in a friendly way like this:

[0] 6432

[1] 2725

[2] 7255

etc - Write an algorithm
**max**that takes an array of integers and finds the largest. - Write an algorithm
**sum**that takes an array of integers and returns the sum. - Write an algorithm
**thresholdCount**that takes an array of integers**a[]**and an int**threshold**and returns the number of elements in a[] that are greater than or equal to threshold. - Write an algorithm
**threeHighest**that takes an int array and returns an array of its three highest elements. - Write an algorithm
**reverseCopy**that takes an int array and returns a copy of the same array with its numbers reversed. - Write an algorithm
**reverseInPlace**that takes an int array and reverses its numbers, returning void.

package arrayalgorithms; import java.util.Random; /** * * @author robertsonj */ public class ArrayAlgorithms { public static void main(String[] args) { int[] a = new int[100]; Random r = new Random(); for (int i = 0; i < 100; i++){ a[i] = r.nextInt(10000); } ArrayAlgorithms alg = new ArrayAlgorithms(); // Call your algorithm functions here... int x = alg.exampleAlgorithm(a); System.out.println(x); } int exampleAlgorithm(int[] array){ // This is a dummy algorithm. // It just shows you how to pass an array to a function and return some value. return 3; } // Add new algorithms here. // ... }

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