codingchallenge2015/int_to_word at master · itmm85/codingchallenge2015 · GitHub

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/**
 *
 */
/**
 * Convert integer to word
 * @author tmora
 *
 */
package int_to_word_rv1;

import java.util.InputMismatchException;
import java.util.Scanner;

public class int_to_word{

	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",
			 			"six million", "seven million", "eight million", "nine million"};


	public static void main(String[] args) {

		//get number
		int valid_number = ask_number();

		// if zero than end program and output
		if (valid_number == 0)
			System.out.println("\nThe word is: zero");
		else{
			try {
			   	System.out.println("\nThe word is: " + int_to_word(valid_number).trim().replaceAll(" +", " "));
			} catch (InputMismatchException e) {
	   			System.out.print("Not a valid integer.");
			}
		}

	}//end main


	// ask and validate number
	private static int ask_number() {
		System.out.println("Please enter a an integer less than a 1,000,000,000 to convert to word: ");
		Scanner kb = new Scanner(System.in);

		// keep asking if it is not an integer
		while (!kb.hasNextInt()) {

            System.out.println("Your input was not an integer, please enter a number less than a 1,000,000,000: ");
            kb.next();
        }

        int good_num = kb.nextInt();

     // keep asking if it is not less than 1,000,000,000
        while (good_num > 999999999){

            System.out.println("Your input was greater than 1,000,000,000 please enter a number less than a 1,000,000,000: ");
            kb.next();
        }

        kb.close();

		return good_num;

	}//end ask_number


	private static String int_to_word(int num) {
		String word = ""; //initialize

				// check if it is a negative number
		 		if(num < 0) {
					num *= -1; //convert to positive to be able to convert to word
		 			word += "negative "; //append 'negative' to string
		 		}

		 		if(num < 20)
		 			word += ones[num];
		 		else if(num < 100)
		 			word += tens[(num / 10) - 1] + " " + int_to_word(num % 10);
		 		else if(num < 1000)
		 			word += hundreds[(num / 100) - 1] + " " + int_to_word(num % 100);
		 		else if(num < 10000)
		 			word += thousands[num / 1000] + " " + int_to_word(num % 1000);
		 		else if(num < 100000)
		 			word += int_to_word(num / 1000) + " " + thousands[0] + " " + int_to_word(num % 1000);
		 		else if(num < 1000000)
		 			word += int_to_word(num / 1000) + " " + thousands[0] + " " + int_to_word(num % 1000);
		 		else if(num < 10000000)
		 			word += millions[num / 1000000] + " " + int_to_word(num % 1000000);
		 		else
		 			word += int_to_word(num / 1000000) + " " + millions[0] + " " + int_to_word(num % 1000000);

		 		return word;
		 	}//end conver_to_word

}//end class