// Project: UnitTests
// Module: amt2words
// Source code file Amt2Words.java
// The amt2Words method in the Amt2Words class inputs
// a double amount < 100.00 and convert it to
// words suitable for using as the amount on a check.
// The Amt2WordsTest class provides the test1 method
// with unit tests for the Amt2Words.amt2Words method.

public class Amt2Words {

    // Traditional test file.
    // Unit tests are in the Amt2WordsTest.java file.
    public static void main(String[] args) {

        System.out.println(amtToWords(63.45));
        System.out.println(amtToWords(18.06));
        System.out.println(amtToWords(0.97));
    }

    public static String amtToWords(double amt) {

        // Extract pieces of input.
        int dollars = (int) amt;
        int tens = dollars / 10;
        int ones = dollars % 10;
        int cents = (int) Math.round(100 * (amt - dollars));

        // Definitions of words for digits.
        String[ ] onesWords = {"zero", "one", "two", "three", "four",
                "five", "six", "seven", "eight", "nine"};
        String[ ] teensWords = {"", "eleven", "twelve", "thirteen",
                "fourteen", "fifteen", "sixteen", "seventeen",
                "eighteen", "nineteen"};
        String[ ] tensWords = {"", "ten", "twenty", "thirty", "forty",
                "fifty", "sixty", "seventy", "eighty", "ninety"};

        // Declare output variable.
        String output = "";

        if (dollars <= 9) {
            output = onesWords[ones];
        }
        else if (dollars <= 19) {
            output = teensWords[ones];
        }
        else if (dollars <= 99) {
            output = tensWords[tens] + " " + onesWords[ones];
        }
        else {
            output = "Out of range";
        }
        return output + " and " + cents + "/100";
    }
}