将数字转换为单词

Question

如何将数字（最多18位数字）转换为单词（英语）。

.e.g。

input 108 
output: onehundredeight 

Answer 1

了解其他的参考看看：

对于Java：Source

import java.text.DecimalFormat; 

public class EnglishNumberToWords { 

    private static final String[] tensNames = { 
    "", 
    " ten", 
    " twenty", 
    " thirty", 
    " forty", 
    " fifty", 
    " sixty", 
    " seventy", 
    " eighty", 
    " ninety" 
    }; 

    private static final String[] numNames = { 
    "", 
    " one", 
    " two", 
    " three", 
    " four", 
    " five", 
    " six", 
    " seven", 
    " eight", 
    " nine", 
    " ten", 
    " eleven", 
    " twelve", 
    " thirteen", 
    " fourteen", 
    " fifteen", 
    " sixteen", 
    " seventeen", 
    " eighteen", 
    " nineteen" 
    }; 

    private static String convertLessThanOneThousand(int number) { 
    String soFar; 

    if (number % 100 < 20){ 
     soFar = numNames[number % 100]; 
     number /= 100; 
    } 
    else { 
     soFar = numNames[number % 10]; 
     number /= 10; 

     soFar = tensNames[number % 10] + soFar; 
     number /= 10; 
    } 
    if (number == 0) return soFar; 
    return numNames[number] + " hundred" + soFar; 
    } 


    public static String convert(long number) { 
    // 0 to 999 999 999 999 
    if (number == 0) { return "zero"; } 

    String snumber = Long.toString(number); 

    // pad with "0" 
    String mask = "000000000000"; 
    DecimalFormat df = new DecimalFormat(mask); 
    snumber = df.format(number); 

    // XXXnnnnnnnnn 
    int billions = Integer.parseInt(snumber.substring(0,3)); 
    // nnnXXXnnnnnn 
    int millions = Integer.parseInt(snumber.substring(3,6)); 
    // nnnnnnXXXnnn 
    int hundredThousands = Integer.parseInt(snumber.substring(6,9)); 
    // nnnnnnnnnXXX 
    int thousands = Integer.parseInt(snumber.substring(9,12));  

    String tradBillions; 
    switch (billions) { 
    case 0: 
     tradBillions = ""; 
     break; 
    case 1 : 
     tradBillions = convertLessThanOneThousand(billions) 
     + " billion "; 
     break; 
    default : 
     tradBillions = convertLessThanOneThousand(billions) 
     + " billion "; 
    } 
    String result = tradBillions; 

    String tradMillions; 
    switch (millions) { 
    case 0: 
     tradMillions = ""; 
     break; 
    case 1 : 
     tradMillions = convertLessThanOneThousand(millions) 
     + " million "; 
     break; 
    default : 
     tradMillions = convertLessThanOneThousand(millions) 
     + " million "; 
    } 
    result = result + tradMillions; 

    String tradHundredThousands; 
    switch (hundredThousands) { 
    case 0: 
     tradHundredThousands = ""; 
     break; 
    case 1 : 
     tradHundredThousands = "one thousand "; 
     break; 
    default : 
     tradHundredThousands = convertLessThanOneThousand(hundredThousands) 
     + " thousand "; 
    } 
    result = result + tradHundredThousands; 

    String tradThousand; 
    tradThousand = convertLessThanOneThousand(thousands); 
    result = result + tradThousand; 

    // remove extra spaces! 
    return result.replaceAll("^\\s+", "").replaceAll("\\b\\s{2,}\\b", " "); 
    } 

    /** 
    * testing 
    * @param args 
    */ 
    public static void main(String[] args) { 
    System.out.println("*** " + EnglishNumberToWords.convert(0)); 
    System.out.println("*** " + EnglishNumberToWords.convert(1)); 
    System.out.println("*** " + EnglishNumberToWords.convert(16)); 
    System.out.println("*** " + EnglishNumberToWords.convert(100)); 
    System.out.println("*** " + EnglishNumberToWords.convert(118)); 
    System.out.println("*** " + EnglishNumberToWords.convert(200)); 
    System.out.println("*** " + EnglishNumberToWords.convert(219)); 
    System.out.println("*** " + EnglishNumberToWords.convert(800)); 
    System.out.println("*** " + EnglishNumberToWords.convert(801)); 
    System.out.println("*** " + EnglishNumberToWords.convert(1316)); 
    System.out.println("*** " + EnglishNumberToWords.convert(1000000)); 
    System.out.println("*** " + EnglishNumberToWords.convert(2000000)); 
    System.out.println("*** " + EnglishNumberToWords.convert(3000200)); 
    System.out.println("*** " + EnglishNumberToWords.convert(700000)); 
    System.out.println("*** " + EnglishNumberToWords.convert(9000000)); 
    System.out.println("*** " + EnglishNumberToWords.convert(9001000)); 
    System.out.println("*** " + EnglishNumberToWords.convert(123456789)); 
    System.out.println("*** " + EnglishNumberToWords.convert(2147483647)); 
    System.out.println("*** " + EnglishNumberToWords.convert(3000000010L)); 

    /* 
    *** zero 
    *** one 
    *** sixteen 
    *** one hundred 
    *** one hundred eighteen 
    *** two hundred 
    *** two hundred nineteen 
    *** eight hundred 
    *** eight hundred one 
    *** one thousand three hundred sixteen 
    *** one million 
    *** two millions 
    *** three millions two hundred 
    *** seven hundred thousand 
    *** nine millions 
    *** nine millions one thousand 
    *** one hundred twenty three millions four hundred 
    **  fifty six thousand seven hundred eighty nine 
    *** two billion one hundred forty seven millions 
    **  four hundred eighty three thousand six hundred forty seven 
    *** three billion ten 
    **/ 
    } 
}