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@armaandhir

armaandhir/NumberWords.java

Created May 23, 2017 18:06
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Prints the textual representation of integer in English.
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NumberWords.java
/**
* The program takes 2 parameters for the main method:
* - first parameter is the number to be converted
* - second parameter is either 1 or 2. 1 represents question 1 and 2 represents question 2
*
* @author armaan
*
*/
public class NumberWords {
/**
* The output should be this file which, when run, will output your answers to the following problems.
*
* 1. When passed a single integer between 0 and 10 the program should print out the textual representation
* of that integer in English. E.g. given the integer 4 your program should print 'four'.
*
* 2. Extend your solution in Q1 to support all integers between 0 and 99999. Consider all cases necessary;
* for example
* - '10001' should print 'Ten Thousand and One'.
* - '6415' should print 'Six Thousand Four Hundred and Fifteen'.
* - '93467' should print 'Ninety Three Thousand Four Hundred and Sixty Seven'.
*
* Program should compile and will be passed each of the integers below as the first entry in the args array passed to the main method.
* It should print out each one in the form '1234 : One Thousand Two Hundred and Thirty Four'.
*
* Question 1 Test Numbers: 0, 2, 4, 6, 8, 10
* Question 2 Test Numbers: 0, 2, 11, 17, 23, 100, 114, 756, 1010, 5500, 10000, 10001, 14389, 99999
*
*/
private static final String[] numberNames = {
"",
"one",
"two",
"three",
"four",
"five",
"six",
"seven",
"eight",
"nine",
"ten",
"eleven",
"twelve",
"thirteen",
"fourteen",
"fifteen",
"sixteen",
"seventeen",
"eighteen",
"nineteen"
};
private static final String[] tenNames = {
"",
"ten",
"twenty",
"thirty",
"forty",
"fifty",
"sixty",
"seventy",
"eighty",
"ninety"
};
/**
* This method handles the solution to Question 1.
* @param number number to be converted to it's word representation.
* @return String converted word string from a number
*/
public String convert1To10(int number) {
if(number < 0 || number > 10) {
return "Number entered is out of bounds";
}
else if(number == 0){
return "Zero";
}
else {
String input = numberNames[number];
return input.substring(0, 1).toUpperCase() + input.substring(1);
}
}
/**
* Private utility function that handles numbers upto 99
* @param number
* @return String string representation of the number
*/
private String convertUpto99(int number){
if(number <= 0 || number > 99) {
return "Number entered is out of bounds";
}
else if(number < 20) {
return numberNames[number];
}
else {
return tenNames[number/10] + " " + numberNames[number%10];
}
}
/**
* Private utility function that handles numbers upto 999
* @param number
* @return String string representation of the number
*/
private String convertUpto999(int number) {
StringBuilder word = new StringBuilder("");
if(number <= 0 || number > 999) {
return "Number entered is out of bounds";
}
else if(number < 100) {
return convertUpto99(number);
}
else{
word.append(numberNames[number/100]);
number %= 100;
if(number == 0){
word.append(" hundred");
return word.toString();
}
word.append(" hundred ");
return word.append("and " + convertUpto99(number).toString()).toString();
}
}
/**
* Private utility function that handles numbers upto 99999
* @param number
* @return String string representation of the number
*/
private String convertUpto99999(int number){
StringBuilder word = new StringBuilder("");
if(number <= 0 || number > 99999) {
return "Number entered is out of bounds";
}
else if(number < 1000) {
return convertUpto999(number);
}
else{
word.append(convertUpto99(number/1000));
number %= 1000;
if(number == 0){
word.append(" thousand");
return word.toString();
}
else if(number < 100 || number/100 < 9) {
word.append(" thousand and ");
}
else{
word.append(" thousand ");
}
return word.append(convertUpto999(number).toString()).toString();
}
}
/**
* Represents the solution to question 2.
* @param number number to be converted to it's word representation.
* @return String converted word string from a number
*/
public String convert(int number) {
if(number < 0 || number > 99999) {
return "Number entered is out of bounds";
}
else if (number == 0){
return "Zero";
}
else{
String input = convertUpto99999(number);
return input.substring(0, 1).toUpperCase() + input.substring(1);
}
}
public static void main(String[] args) {
NumberWords obj = new NumberWords();
int input = 0;
String param = null;
try{
input = Integer.parseInt(args[0]);
param = args[1];
}
catch(Exception ex){
System.err.println(ex);
}
if(param.equals("1")){
System.out.println(Integer.toString(input) + ": " + obj.convert1To10(input));
}
else if(param.equals("2")){
System.out.println(Integer.toString(input) + ": " + obj.convert(input));
}
else{
System.out.println("Check arguments. 2nd argument needs to be 1 or 2.");
}
}
}
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