I have seen a lot of algorithms in which you give them a number say "123" and it converts it to One hundred twenty three. But I can't seem to find something that does the opposite, and the ones I did find only do it up to the number 1000. Can anyone direct me in the correct way as what I could do to create a method that takes "One thousand two hundred and thirty four" and gives back "1234"
I hope below code will do the job in most of the cases. However some modification might be required as I've not tested properly yet.
Assumption:
If you need to support first two points, you can very easily do that.
boolean isValidInput = true;
long result = 0;
long finalResult = 0;
List<String> allowedStrings = Arrays.asList
(
"zero","one","two","three","four","five","six","seven",
"eight","nine","ten","eleven","twelve","thirteen","fourteen",
"fifteen","sixteen","seventeen","eighteen","nineteen","twenty",
"thirty","forty","fifty","sixty","seventy","eighty","ninety",
"hundred","thousand","million","billion","trillion"
);
String input="One hundred two thousand and thirty four";
if(input != null && input.length()> 0)
{
input = input.replaceAll("-", " ");
input = input.toLowerCase().replaceAll(" and", " ");
String[] splittedParts = input.trim().split("\\s+");
for(String str : splittedParts)
{
if(!allowedStrings.contains(str))
{
isValidInput = false;
System.out.println("Invalid word found : "+str);
break;
}
}
if(isValidInput)
{
for(String str : splittedParts)
{
if(str.equalsIgnoreCase("zero")) {
result += 0;
}
else if(str.equalsIgnoreCase("one")) {
result += 1;
}
else if(str.equalsIgnoreCase("two")) {
result += 2;
}
else if(str.equalsIgnoreCase("three")) {
result += 3;
}
else if(str.equalsIgnoreCase("four")) {
result += 4;
}
else if(str.equalsIgnoreCase("five")) {
result += 5;
}
else if(str.equalsIgnoreCase("six")) {
result += 6;
}
else if(str.equalsIgnoreCase("seven")) {
result += 7;
}
else if(str.equalsIgnoreCase("eight")) {
result += 8;
}
else if(str.equalsIgnoreCase("nine")) {
result += 9;
}
else if(str.equalsIgnoreCase("ten")) {
result += 10;
}
else if(str.equalsIgnoreCase("eleven")) {
result += 11;
}
else if(str.equalsIgnoreCase("twelve")) {
result += 12;
}
else if(str.equalsIgnoreCase("thirteen")) {
result += 13;
}
else if(str.equalsIgnoreCase("fourteen")) {
result += 14;
}
else if(str.equalsIgnoreCase("fifteen")) {
result += 15;
}
else if(str.equalsIgnoreCase("sixteen")) {
result += 16;
}
else if(str.equalsIgnoreCase("seventeen")) {
result += 17;
}
else if(str.equalsIgnoreCase("eighteen")) {
result += 18;
}
else if(str.equalsIgnoreCase("nineteen")) {
result += 19;
}
else if(str.equalsIgnoreCase("twenty")) {
result += 20;
}
else if(str.equalsIgnoreCase("thirty")) {
result += 30;
}
else if(str.equalsIgnoreCase("forty")) {
result += 40;
}
else if(str.equalsIgnoreCase("fifty")) {
result += 50;
}
else if(str.equalsIgnoreCase("sixty")) {
result += 60;
}
else if(str.equalsIgnoreCase("seventy")) {
result += 70;
}
else if(str.equalsIgnoreCase("eighty")) {
result += 80;
}
else if(str.equalsIgnoreCase("ninety")) {
result += 90;
}
else if(str.equalsIgnoreCase("hundred")) {
result *= 100;
}
else if(str.equalsIgnoreCase("thousand")) {
result *= 1000;
finalResult += result;
result=0;
}
else if(str.equalsIgnoreCase("million")) {
result *= 1000000;
finalResult += result;
result=0;
}
else if(str.equalsIgnoreCase("billion")) {
result *= 1000000000;
finalResult += result;
result=0;
}
else if(str.equalsIgnoreCase("trillion")) {
result *= 1000000000000L;
finalResult += result;
result=0;
}
}
finalResult += result;
result=0;
System.out.println(finalResult);
}
}