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NumberToWords.cs
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NumberToWords.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Numbro {
public static class NumberToWords {
private static readonly string[] UnitsMap = { "nul", "unu", "du", "tri", "kvar", "kvin", "ses", "sep", "ok", "naŭ" };
private static readonly Dictionary<int, string> TensMap = new Dictionary<int, string>
{{ 1000000000, " miliardo" }, { 1000000 , " miliono" }, { 1000, " mil" }, { 100, "cent" }, { 10, "dek" }, { 1, null }};
private const string minus = "minus";
public static string Convert(int number) {
var words = number < 0 ? minus + " " : string.Empty;
number = Math.Abs (number);
words += number <= 1 ? UnitsMap[number] : ConvertInside (number);
return words;
}
// todo: Rename this method really...
private static string ConvertInside(int number) {
if (number == 1)
return string.Empty;
var parts = new List<string> ();
foreach (var item in TensMap.Where (x => number / x.Key > 0)) {
parts.Add (!string.IsNullOrEmpty (item.Value)
? $"{ConvertInside (number / item.Key)}{TrimMil (item, number)}"
: UnitsMap[number]);
number %= item.Key;
}
var toWords = string.Join (" ", parts.ToArray ()).TrimStart (' ');
return toWords;
}
private static string TrimMil(KeyValuePair<int, string> item, int number) {
if (item.Key != 1000)
return item.Value;
var quotient = number / item.Key % 10;
return quotient < 2 || quotient > 9
? item.Value
: item.Value.TrimStart (' ');
}
public static string ConvertToOrdinal(int number) {
return Convert (number) + "a";
}
public static string ToWords(this int number) {
return Convert (number);
}
public static string ToOrdinalWords(this int number) {
return ConvertToOrdinal (number);
}
}
}