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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <stdlib.h>
  4.  
  5. void convert_to_words(char *num)
  6. {
  7.     int len = strlen(num);  
  8.  
  9.     char *single_digits[] = { "zero", "one", "two", "three", "four",
  10.                               "five", "six", "seven", "eight", "nine"};
  11.  
  12.  
  13.     char *two_digits[] = {"", "ten", "eleven", "twelve", "thirteen", "fourteen",
  14.                      "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"};
  15.  
  16.  
  17.     char *tens_multiple[] = {"", "", "twenty", "thirty", "forty", "fifty",
  18.                              "sixty", "seventy", "eighty", "ninety"};
  19.  
  20.     char *tens_power[] = {"hundred", "thousand"};
  21.  
  22.     /* Used for debugging purpose only */
  23.     printf("\n%s: ", num);
  24.  
  25.     /* For single digit number */
  26.     if (len == 1) {
  27.         printf("%s\n", single_digits[*num - '0']);
  28.         return;
  29.     }
  30.  
  31.      /* Iterate while num is not '\0' */
  32.      while (*num != '\0') {
  33.  
  34.         /* Code path for first 2 digits */
  35.         if (len >= 3) {
  36.             if (*num -'0' != 0) {
  37.                 printf("%s ", single_digits[*num - '0']);
  38.                 printf("%s ", tens_power[len-3]); // here len can be 3 or 4
  39.             }
  40.             --len;
  41.         }
  42.  
  43.         /* Code path for last 2 digits */
  44.         else {
  45.             /* Need to explicitly handle 10-19. Sum of the two digits is
  46.                used as index of "two_digits" array of strings */
  47.             if (*num == '1') {
  48.                 int sum = *num - '0' + *(num + 1)- '0';
  49.                 printf("%s\n", two_digits[sum]);
  50.                 return;
  51.             }
  52.  
  53.             /* Need to explicitely handle 20 */
  54.             else if (*num == '2' && *(num + 1) == '0') {
  55.                 printf("twenty\n");
  56.                 return;
  57.             }
  58.  
  59.             /* Rest of the two digit numbers i.e., 21 to 99 */
  60.             else {
  61.                 int i = *num - '0';
  62.                 printf("%s ", i? tens_multiple[i]: "");
  63.                 ++num;
  64.                 if (*num != '0')
  65.                     printf("%s ", single_digits[*num - '0']);
  66.             }
  67.         }
  68.         ++num;
  69.     }
  70. }
  71.  
  72. /* Driver program to test above function */
  73. int main(void)
  74. {
  75.     convert_to_words("9923");
  76.     convert_to_words("523");
  77.     convert_to_words("89");
  78.     convert_to_words("8989");
  79.  
  80.     return 0;
  81. }
Success #stdin #stdout 0s 9432KB
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stdin
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Standard input is empty
stdout
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9923: nine thousand nine hundred twenty three 
523: five hundred twenty three 
89: eighty nine 
8989: eight thousand nine hundred eighty nine
https://ideone.com/ngR7pf
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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