Initial Commit

src/codetrotters/challenge/IntToWord.java

@@ -0,0 +1,83 @@
+package codetrotters.challenge;
+
+import java.util.InputMismatchException;
+import java.util.Scanner;
+
+/**
+ * @author      Emanuel Correa Rivera <emanuel.correa@upr.edu>
+ * @version     1.8
+ * @since       2015-11-17
+ */
+
+public class IntToWord {
+
+	/**
+	 * String arrays that hold each word necessary for the conversion.
+	 */
+	static String[] ones = {"", "one","two","three","four","five","six","seven","eight","nine","ten",
+			"eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen","nineteen"};
+	static String[] tens = {"ten", "twenty","thirty","forty","fifty","sixty","seventy","eighty","ninety"};
+	static String[] hundreds = {"one hundred", "two hundred", "three hundred", "four hundred", "five hundred",
+			"six hundred", "seven hundred", "eight hundred", "nine hundred"};
+	static String[] thousands = {"thousand", "one thousand", "two thousand", "three thousand", "four thousand",
+			"five thousand", "six thousand", "seven thousand", "eight thousand", "nine thousand"};
+	static String[] millions = {"million", "one million", "two million", "three million", "four million", "five million",
+			"sixe million", "seven million", "eight million", "nine million"};
+
+	public static void main(String[] args) {
+
+		System.out.println("Write an integer you wish to convert to a word: ");
+		Scanner kb = new Scanner(System.in);
+
+		try {
+			System.out.println("\nThe word is: " + int_to_word(kb.nextInt()).trim().replaceAll(" +", " "));
+		} catch (InputMismatchException e) {
+			System.out.print("Not a valid integer.");
+		}
+		kb.close();
+
+	}
+
+	/**
+	 * Converts an integer to an English word.
+	 * 
+	 * It is assumed the function will never receive a number greater than 999,999,999.
+	 * 
+	 * And even more explanations to follow in consecutive
+	 * paragraphs separated by HTML paragraph breaks.
+	 *
+	 * @param  i integer to be converted.
+	 * @return English word equivalent of the integer.
+	 */
+	private static String int_to_word(int i) {
+
+		String word = "";
+
+		if(i < 0) {
+			i *= -1;
+			word += "negative ";
+		}
+
+		if(i < 20)
+			word = ones[i];
+		else if(i < 100)
+			word += tens[(i / 10) - 1] + " " + int_to_word(i % 10);
+		else if(i < 1000)
+			word += hundreds[(i / 100) - 1] + " " + int_to_word(i % 100);
+		else if(i < 10000)
+			word += thousands[i / 1000] + " " + int_to_word(i % 1000);
+		else if(i < 100000)
+			word += int_to_word(i / 1000) + " " + thousands[0] + " " + int_to_word(i % 1000);
+		else if(i < 1000000)
+			word += int_to_word(i / 1000) + " " + thousands[0] + " " + int_to_word(i % 1000);
+		else if(i < 10000000)
+			word += millions[i / 1000000] + " " + int_to_word(i % 1000000);
+		else if(i < 100000000)
+			word += int_to_word(i / 1000000) + " " + millions[0] + " " + int_to_word(i % 1000000);
+		else
+			word += int_to_word(i / 1000000) + " " + millions[0] + " " + int_to_word(i % 1000000);
+
+		return word;
+	}
+
+}