RandomNumberBucket.java

package org.drip.zen.numbers;

public class RandomNumberBucket {

    public static double CalculatePercentage (int count, int total)
    {
        double percent = 100. * (double) count / (double) total;
        return percent;
    }

    public static int FindBucketIndex (double number)
    {
        int bucketIndex = 0;

        if (number > 0 && number <= 0.2)
            bucketIndex = 0;
        else if (number > 0.2 && number <= 0.4)
            bucketIndex = 1;
        else if (number > 0.4 && number <= 0.6)
            bucketIndex = 2;
        else if (number > 0.6 && number <= 0.8)
            bucketIndex = 3;
        else if (number > 0.8 && number <= 1.0)
            bucketIndex = 4;

        return bucketIndex;
    }

    public static void main (String[] args)
    {
        int countbucket0 = 0;
        int countbucket1 = 0;
        int countbucket2 = 0;
        int countbucket3 = 0;
        int countbucket4 = 0;

        int totalTrials = 1000;
        int trialNumber = 1;

        while (trialNumber <= totalTrials)
        {
            double randomNumber = Math.random();

            int randomNumberBucket = FindBucketIndex (randomNumber);

            if (randomNumberBucket == 0)
                countbucket0 = countbucket0 + 1;
            else if (randomNumberBucket == 1)
                countbucket1 = countbucket1 + 1;
            else if (randomNumberBucket == 2)
                countbucket2 = countbucket2 + 1;
            else if (randomNumberBucket == 3)
                countbucket3 = countbucket3 + 1;
            else if (randomNumberBucket == 4)
                countbucket4 = countbucket4 + 1;

            trialNumber = trialNumber + 1;
        }

        System.out.println ("\t[" + countbucket0 + " | " + countbucket1 + " | " + countbucket2 + " | " + countbucket3 + " | " + countbucket4 + "]");

        System.out.println ("\t[" +
            CalculatePercentage (countbucket0, totalTrials) + "% | " +
            CalculatePercentage (countbucket1, totalTrials) + "% | " +
            CalculatePercentage (countbucket2, totalTrials) + "% | " +
            CalculatePercentage (countbucket3, totalTrials) + "% | " +
            CalculatePercentage (countbucket4, totalTrials) + "%]"
        );
    }
}