把int型非负数转换为英文

  1 /**
  2  * 
  3  * @author Rust Fisher
  4  * biggest number = 2 147 483 648 - 1
  5  * Two Billion One Hundred Forty Seven Million Four Hundred Eighty Three Thousand Six Hundred Forty Seven
  6  */
  7 public class Int2Eng {
  8     public static String numberToWords(int num) {
  9         String result = "";
 10         int inputNum = num;
 11         if (num == 0) {
 12             result = "Zero";
 13             return result;
 14         }
 15         
 16         if (inputNum/1000 == 0 ) {//0 < num < 1000
 17             return getThousand(inputNum%1000);// 处理 xxx
 18         }
 19         
 20         result = getThousand(inputNum%1000);
 21         inputNum = inputNum/1000; //Rust:cut the tail 2 147 483 xxx
 22         
 23         if (inputNum/1000 == 0) {    // 1000 <= num < 1 000 000 
 24             if (result.equals("")) {
 25                 return (getThousand(inputNum%1000) + " Thousand");
 26             } else {
 27                 return (getThousand(inputNum%1000) + " Thousand " + result);
 28             }
 29         } else {// 1 000 000 < num
 30             if (result.equals("") && inputNum%1000 == 0) {
 31                 result = getThousand(inputNum%1000);//do nothing
 32             } else if (!result.equals("") && inputNum%1000 != 0){
 33                 result = getThousand(inputNum%1000) + " Thousand " + result;
 34             } else if (result.equals("") && inputNum%1000 != 0) {
 35                 result = getThousand(inputNum%1000) + " Thousand" + result;
 36             }
 37         }
 38 
 39         inputNum = inputNum/1000;
 40         if (inputNum/1000 == 0) {//1 000 000 <= num < 1 000 000 000
 41             if (result.equals("")) {
 42                 return (getThousand(inputNum%1000) + " Million");
 43             } else {
 44                 return (getThousand(inputNum%1000) + " Million " + result);
 45             }
 46         } else {
 47             if (result.equals("") && inputNum%1000 == 0) {
 48                 result = getThousand(inputNum%1000);
 49             } else if (!result.equals("") && inputNum%1000 != 0){
 50                 result = getThousand(inputNum%1000) + " Million " + result;
 51             } else if (result.equals("") && inputNum%1000 != 0) {
 52                 result = getThousand(inputNum%1000) + " Million" + result;
 53             }
 54         }
 55         
 56         inputNum = inputNum/1000;
 57         if (result.equals("")) {
 58             if (inputNum == 1) {
 59                 return ("One"+ " Billion");
 60             } else if (inputNum == 2) {
 61                 return ("Two"+ " Billion");
 62             }
 63         } else {
 64             if (inputNum == 1) {
 65                 return ("One"+ " Billion " + result);
 66             } else if (inputNum == 2) {
 67                 return ("Two"+ " Billion " + result);
 68             }
 69         }
 70         return result;
 71     }
 72     
 73     public static String getThousand(int input) {
 74         String MaxNum = "Two Billion One Hundred Forty Seven Million" +
 75                 " Four Hundred Eighty Three Thousand Six Hundred Forty Eight";
 76         String single[] = {"Zero", "One", "Two", "Three", "Four", "Five", "Six",
 77                 "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve", "Thirteen", 
 78                 "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"};
 79         String tens[] = {"Twenty","Thirty","Forty","Fifty","Sixty","Seventy","Eighty","Ninety"};
 80 
 81         String output = "";
 82 
 83         int res1 = input%1000;
 84         if (res1/100 != 0) {
 85             output = output + single[res1/100] + " Hundred";
 86         }
 87         res1 = res1%100;// 1~99
 88 
 89         if (res1 == 0) {
 90             // do nothing
 91         } else if (res1 < 20) {
 92             if (output.equals("")) {
 93                 output = output + single[res1];
 94             } else {
 95                 output = output + " " + single[res1];
 96             }
 97             return output;
 98         } else if (res1 >= 20) {
 99             if (output.equals("")) {
100                 output = tens[res1/10 - 2];
101             } else {
102                 output = output + " " + tens[res1/10 - 2];
103             }
104         }
105 
106         res1 = res1%10;
107         if (res1 == 0) {
108 
109         } else {
110             output = output +  " " +single[res1];
111         }
112         return output;
113     }
114     
115     public static void main(String args[]) {
116 
117         System.out.println(numberToWords(2127483622));
118         System.out.println(numberToWords(12));
119         System.out.println(numberToWords(3555000));
120         System.out.println(numberToWords(1000));
121         System.out.println(numberToWords(1000000));
122         System.out.println(numberToWords(2000000010));
123         
124     }
125 }