把数字数值转换成单词形式

  1 /*
  2 ** 把非负整数数值转化为单词形式
  3 */
  4 
  5 #include <stdio.h>
  6 #include <string.h>
  7 
  8 void written_amount( unsigned int amount, char *buffer );
  9 
 10 int 
 11 main()
 12 {
 13     unsigned int num;
 14     scanf( "%u", &num );
 15     char b[100] = { 0 };
 16     
 17     written_amount( num, b );
 18     
 19     puts( b );
 20     
 21     return 0;
 22 }
 23 
 24 /*
 25 ** 函数功能：把amount的值转化为单词形式，结果存储在buffer中
 26 */
 27 void 
 28 written_amount( unsigned int amount, char *buffer )
 29 {
 30     /*
 31     ** 数字对应的单词，分为4组
 32     */
 33     char word_1_9[10][6] = { "ZERO", "ONE", "TWO", "THREE", "FOUR", "FIVE",
 34                             "SIX", "SEVEN", "EIGHT", "NINE" };
 35     char word_10_19[10][10] = {"TEN", "ELEVEN", "TWELVE", "THIRTEEN", "FOURTEEN", "FIFTEEN",
 36                             "SIXTEEN", "SEVENTEEN", "EIGHTEEN", "NINETEEN" };
 37     char word_ty[10][8] = { "", "", "TWENTY", "THIRTY", "FORTY", "FIFTY", 
 38                             "SIXTY", "SEVENTY", "EIGHTY", "NINETY" };
 39     char word_div[4][9] = { "HUNDRED", "THOUSAND", "MILLION", "BILLION" };
 40     
 41     static int count = 0;  // 记录千分位的个数
 42     unsigned int tmp = amount / 1000; 
 43     
 44     /*
 45     ** 用递归函数，直到数值< 1000
 46     */
 47     if( tmp )
 48     {
 49         count ++;  // 千分位的个数增加
 50         written_amount( tmp, buffer ); // 递归，处理下一个千分位
 51     }
 52     
 53     int val = amount % 1000; // 3位3位地进行转化单词
 54     
 55     /*
 56     ** 值大于100，先把百位上的数的单词存到buffer中
 57     ** 后面加上 HUNDRED
 58     ** 把值%100，变成两位数，后续继续处理
 59     */
 60     if( val >= 100 )
 61     {
 62         strcat( buffer, word_1_9[ val / 100 ] );
 63         strcat( buffer, " " );
 64         strcat( buffer, word_div[ 0 ] );
 65         val %= 100;
 66     }
 67     
 68     /*
 69     ** 值在20至99之间，先把几十对应的单词加到buffer中
 70     ** 再%10，后续处理个位上的数
 71     */
 72     if( val >= 20 && val <= 99 )
 73     {
 74         strcat( buffer, " " );
 75         strcat( buffer, word_ty[ val / 10 ] );
 76         val %= 10;
 77     }
 78     
 79     /*
 80     ** 值在10到19之间，直接把对应的单词加到buffer中
 81     */
 82     if( val >= 10 && val <= 19 )
 83     {
 84         strcat( buffer, " " );
 85         strcat( buffer, word_10_19[ val % 10 ] );
 86     }
 87     
 88     /*
 89     ** 值在0到9之间，把对应的单词加到buffer中
 90     */
 91     if( val >= 0 && val <= 9 )
 92     {
 93         strcat( buffer, " " );
 94         strcat( buffer, word_1_9[ val ] );
 95     }
 96     
 97     /*
 98     ** 一个千位处理完后，后面加上对应的分位单词"THOUSAND"、"MILLION"等
 99     */
100     if( count > 0 )
101     {
102         strcat( buffer, " " );
103         strcat( buffer, word_div[ count-- ] );
104         strcat( buffer, " " );
105     }
106 }