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import java.util.ArrayList;
import java.math.*;
import java.util.Scanner;
public class NumberName {
public static void main(String args[]){
//Used http://www.englishlessonsbrighton.co.uk/saying-large-numbers-english/ and https://www.grammarly.com/blog/hyphen-in-compound-numbers/
Scanner scn = new Scanner(System.in);
System.out.println("Number to British English text");
System.out.println("How to use: type a whole number, press enter and the program will say it's full proper name. Close the program to stop it.");
System.out.println("NOTE: Your numbers must be between 2147483647 and -2147483648 (any characters that are not numbers and - will result in error)");
while (true) {
try {
int n = Integer.parseInt(scn.nextLine().trim());
System.out.println(NameOfNumber(n));
} catch (Exception ex) {
System.out.println("ERROR: Please type a whole number between 2147483647 and -2147483648 (NOTE: any characters that are not numbers and - will result in this error)");
}
}
}
public static String NameOfNumber(int num) {
StringBuilder name = new StringBuilder(num < 0 ? "negative " : "");
var number_parts = new ArrayList<Integer>();
while (num != 0) {
number_parts.add(Math.abs(num % 1000));
num /= 1000;
}
for (int i = number_parts.size() - 1; i > -1; i--){
int curr_num = number_parts.get(i);
if ((curr_num + "").length() == 3) {
name.append(SmallNumName(curr_num / 100)).append(" hundred");
curr_num %= 100;
if (curr_num != 0) name.append(" and ");
}
name.append(SmallNumName(curr_num));
switch (i) {
case 1: if (number_parts.get(1) != 0) {
name.append(" thousand");
if (number_parts.get(0) != 0) {
if (number_parts.get(0) / 100 == 0) name.append(" and ");
else name.append(", ");
}
} break;
case 2: if (number_parts.get(2) != 0) {
name.append(" million");
if (number_parts.get(0) != 0 || number_parts.get(1) != 0) {
if (number_parts.get(1) / 100 == 0) name.append(" and ");
else name.append(", ");
}
} break;
case 3: if (number_parts.get(3) != 0) {
name.append(" milliard");
if (number_parts.get(0) != 0 || number_parts.get(1) != 0 || number_parts.get(2) != 0) {
if (number_parts.get(2) / 100 == 0) name.append(" and ");
else name.append(", ");
}
} break;
}
}
return name.toString();
}
private static String SmallNumName(int num) {
int part = 1;
switch (num) {
case 0: return "";
case 1: return "one";
case 2: return "two";
case 3: return "three";
case 4: return "four";
case 5: return "five";
case 6: return "six";
case 7: return "seven";
case 8: return "eight";
case 9: return "nine";
case 10: return "ten";
case 11: return "eleven";
case 12: return "twelve";
case 13: return "thirteen";
case 15: return "fifteen";
case 18: return "eighteen";
case 14: part = 4;
case 16: if (part == 1) part = 6;
case 17: if (part == 1) part = 7;
case 19: if (part == 1) part = 9;
return SmallNumName(part) + "teen";
}
if (num > 19 && num < 100) {
int f_digit = num / 10;
StringBuilder name = new StringBuilder();
switch (f_digit) {
case 2: name.append("twenty"); break;
case 3: name.append("thirty"); break;
case 4: name.append("forty"); break;
case 5: name.append("fifty"); break;
case 8: name.append("eighty"); break;
default: name.append(SmallNumName(f_digit)).append("ty"); break;
}
return num % 10 != 0 ? name + "-" + SmallNumName(num % 10) : name.toString();
}
return "ERR";
}
}
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