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  1. #include<stdio.h>
  2.  
  3. void convert_to_words(char *num);
  4. int main(void)
  5. {
  6.     convert_to_words("9923");
  7.     convert_to_words("523");
  8.     convert_to_words("89");
  9.     convert_to_words("8989");
  10.  
  11.     return 0;
  12. }
  13. void convert_to_words(char *num)
  14. {
  15.     int len = strlen(num);  // Get number of digits in given number
  16.  
  17.     /* Base cases */
  18.     if (len == 0) {
  19.         fprintf(stderr, "empty string\n");
  20.         return;
  21.     }
  22.     if (len > 4) {
  23.         fprintf(stderr, "Length more than 4 is not supported\n");
  24.         return;
  25.     }
  26.  
  27.     /* The first string is not used, it is to make array indexing simple */
  28.     char *single_digits[] = { "zero", "one", "two", "three", "four",
  29.                               "five", "six", "seven", "eight", "nine"};
  30.  
  31.     /* The first string is not used, it is to make array indexing simple */
  32.     char *two_digits[] = {"", "ten", "eleven", "twelve", "thirteen", "fourteen",
  33.                      "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"};
  34.  
  35.     /* The first two string are not used, they are to make array indexing simple*/
  36.     char *tens_multiple[] = {"", "", "twenty", "thirty", "forty", "fifty",
  37.                              "sixty", "seventy", "eighty", "ninety"};
  38.  
  39.     char *tens_power[] = {"hundred", "thousand"};
  40.  
  41.     /* Used for debugging purpose only */
  42.     printf("\n%s: ", num);
  43.  
  44.     /* For single digit number */
  45.     if (len == 1) {
  46.         printf("%s\n", single_digits[*num - '0']);
  47.         return;
  48.     }
  49.  
  50.      /* Iterate while num is not '\0' */
  51.      while (*num != '\0') {
  52.  
  53.         /* Code path for first 2 digits */
  54.         if (len >= 3) {
  55.             if (*num -'0' != 0) {
  56.                 printf("%s ", single_digits[*num - '0']);
  57.                 printf("%s ", tens_power[len-3]); // here len can be 3 or 4
  58.             }
  59.             --len;
  60.         }
  61.  
  62.         /* Code path for last 2 digits */
  63.         else {
  64.             /* Need to explicitly handle 10-19. Sum of the two digits is
  65.                used as index of "two_digits" array of strings */
  66.             if (*num == '1') {
  67.                 int sum = *num - '0' + *(num + 1)- '0';
  68.                 printf("%s\n", two_digits[sum]);
  69.                 return;
  70.             }
  71.  
  72.             /* Need to explicitely handle 20 */
  73.             else if (*num == '2' && *(num + 1) == '0') {
  74.                 printf("twenty\n");
  75.                 return;
  76.             }
  77.  
  78.             /* Rest of the two digit numbers i.e., 21 to 99 */
  79.             else {
  80.                 int i = *num - '0';
  81.                 printf("%s ", i? tens_multiple[i]: "");
  82.                 ++num;
  83.                 if (*num != '0')
  84.                     printf("%s ", single_digits[*num - '0']);
  85.             }
  86.         }
  87.         ++num;
  88.     }
  89. }
Success #stdin #stdout 0s 9432KB
comments (?)
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/2DTTO5
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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