Loops.java

package org.drip.zen.juice;

/*
 * 1) Sum Using WHILE Loop
 * 2) Sum Using FOR Loop
 * 3) Factorial Using WHILE Loop
 * 4) Factorial Using FOR Loop
 * 5) Counting the letters in a word
 * 6) Counting vowels in a word
 * 7) Counting consonants in a word
 * 8) Counting words in a sentence
 */

public class Loops {

    static double SumUsingWhileLoop (double firstNumber, double lastNumber)
    {
        double sum = 0;
        double counter = firstNumber;

        while (counter <= lastNumber)
        {
            sum = sum + counter;
            counter = counter + 1;
        }

        return sum;
    }

    static double SumUsingForLoop (double firstNumber, double lastNumber)
    {
        double sum = 0;

        for (double counter = firstNumber; counter <= lastNumber; counter = counter + 1)
        {
            sum = sum + counter;
        }

        return sum;
    }

    static double FactorialUsingWhileLoop (double lastNumber)
    {
        double factorial = 1;
        double counter = 1;

        while (counter <= lastNumber)
        {
            factorial = factorial * counter;
            counter = counter + 1;
        }

        return factorial;
    }

    static double FactorialUsingForLoop (double lastNumber)
    {
        double factorial = 1;

        for (double counter = 1; counter <= lastNumber; counter = counter + 1)
        {
            factorial = factorial * counter;
        }

        return factorial;
    }

    static int WordSize (String word)
    {
        char[] letters = word.toCharArray();

        int size = letters.length;
        return size;
    }

    static int VowelCount (String word)
    {
        int size = WordSize (word);

        int numberOfVowels = 0;

        for (int counter = 0; counter < size; counter = counter + 1)
        {
            char letter = word.charAt (counter);

            if (letter == 'a' || letter == 'e' || letter == 'i' || letter == 'o' || letter == 'u')
            {
                numberOfVowels = numberOfVowels + 1;
            }
        }

        return numberOfVowels;
    }

    static int ConsonantCount (String word)
    {
        int size = WordSize (word);

        int numberOfConsonants = 0;

        for (int counter = 0; counter < size; counter = counter + 1)
        {
            char letter = word.charAt (counter);

            if (letter == 'b' || letter == 'c' || letter == 'd' || letter == 'f' || letter == 'g' || letter == 'h' || letter == 'j' ||
                letter == 'k' || letter == 'l' || letter == 'm' || letter == 'n' || letter == 'p' || letter == 'q' || letter == 'r' ||
                letter == 's' || letter == 't' || letter == 'v' || letter == 'w' || letter == 'x' || letter == 'y' || letter == 'z')
            {
                numberOfConsonants = numberOfConsonants + 1;
            }
        }

        return numberOfConsonants;
    }

    static int WordCount (String sentence)
    {
        int size = WordSize (sentence);

        int numberOfWords = 1;

        for (int counter = 0; counter < size; counter = counter + 1)
        {
            char letter = sentence.charAt (counter);

            if (letter == ' ')
            {
                numberOfWords = numberOfWords + 1;
            }
        }

        return numberOfWords;
    }

    public static void main (String[] arguments)
    {
        double beginNumber = 1;
        double endNumber = 10;

        double sumWithWHILEStatement = SumUsingWhileLoop (beginNumber, endNumber);

        System.out.println ("\tSum with WHILE KeyWord       : " + sumWithWHILEStatement);

        double sumWithFORStatement = SumUsingForLoop (beginNumber, endNumber);

        System.out.println ("\tSum with FOR KeyWord         : " + sumWithFORStatement);

        double factorialWithWHILEStatement = FactorialUsingWhileLoop (endNumber);

        System.out.println ("\tFactorial with WHILE KeyWord : " + factorialWithWHILEStatement);

        double factorialWithFORStatement = FactorialUsingForLoop (endNumber);

        System.out.println ("\tFactorial with FOR KeyWord   : " + factorialWithFORStatement);

        String bigWord = "totalitarianism";

        int bigWordSize = WordSize (bigWord);

        System.out.println ("\tSize of " + bigWord + " is " + bigWordSize);

        int vowelsInBigWord = VowelCount (bigWord);

        System.out.println ("\tNumber of Vowels in " + bigWord + " is " + vowelsInBigWord);

        int consonantsInBigWord = ConsonantCount (bigWord);

        System.out.println ("\tNumber of Consonants in " + bigWord + " is " + consonantsInBigWord);

        String bigSentence = "He who pays the piper calls the tune.";

        int wordsInBigSentence = WordCount (bigSentence);

        System.out.println ("\tNumber of Words in '" + bigSentence + "' is " + wordsInBigSentence);
    }
}