这应该可以正常工作：
public static class HumanFriendlyInteger{ static string[] ones = new string[] { "", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" }; static string[] teens = new string[] { "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen" }; static string[] tens = new string[] { "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety" }; static string[] thousandsGroups = { "", " Thousand", " Million", " Billion" }; private static string FriendlyInteger(int n, string leftDigits, int thousands) { if (n == 0) { return leftDigits; } string friendlyInt = leftDigits; if (friendlyInt.Length > 0) { friendlyInt += " "; } if (n < 10) { friendlyInt += ones[n]; } else if (n < 20) { friendlyInt += teens[n - 10]; } else if (n < 100) { friendlyInt += FriendlyInteger(n % 10, tens[n / 10 - 2], 0); } else if (n < 1000) { friendlyInt += FriendlyInteger(n % 100, (ones[n / 100] + " Hundred"), 0); } else { friendlyInt += FriendlyInteger(n % 1000, FriendlyInteger(n / 1000, "", thousands+1), 0); if (n % 1000 == 0) { return friendlyInt; } } return friendlyInt + thousandsGroups[thousands]; } public static string IntegerToWritten(int n) { if (n == 0) { return "Zero"; } else if (n < 0) { return "Negative " + IntegerToWritten(-n); } return FriendlyInteger(n, "", 0); }}（经过编辑以修复带有百万，十亿等错误）
