Demonstration for 'Arrays of Golden Sun' blog post

Arrays.java

/*
 * Copyright (c) 2014.
 */

package main.java.com.oopuniversity.basics.variables;

/**
 * Created by OOPUniversity on 11/15/2014.
 */
public class Arrays {
    int [] testResults = new int [ 20 ];

    public static void main(String [] args) {
        hardCodedTestScoresAverage();
        randomTestScoresAverage();
    }
    static void hardCodedTestScoresAverage() {
        int [] testScores = { 100, 95, 22, 84 };

        System.out.println("Average is " + calculateAverage2(testScores));
    }

    static int getNumberOfScores() {
        return 20;
    }

    static int getScore(int index) {
    //We'll ignore the index for now
        return (int)(Math.random()*100.0+1.0);
    }

    static void randomTestScoresAverage() {
        int [] testScores = new int[ getNumberOfScores() ];
        for ( int i = 0; i < getNumberOfScores(); i++ ) {
            testScores[i] = getScore(i);
            System.out.println("Score " + i + " is " + testScores[i]);
        }
        System.out.println("Average is " + calculateAverage2(testScores));
    }

    static float calculateAverage1( int [] valuesToAverage ) {
        float total = 0;

        for (int i = 0; i < 20; i ++ ) {
            total = total + valuesToAverage[i];
        }
        return total / 20f;
    }

    static float calculateAverage2( int [] valuesToAverage ) {
        float total = 0;
        float valueCount = valuesToAverage.length;

        for (int i = 0; i < valueCount; i++ ) {
            total = total + valuesToAverage[i];
    }
    return total/valueCount;
    }

}