Thread: Converting Numbers to Words

Let's start from scratch.

First, you need to be able to convert values from 0 thru 999 correctly. The hundred's is easy. Then the ten's, then the one's.

Second, if ten's = 1 you have a special case. Add that logic next

Third, add the logic that does the above for every 3 digits to get the thousand, million, billion... you need to count from the right and skip every 3 values until you get to the highest triple, the process as above following it with the magnitude (million, trillion, etc.) The back yo 3 values and do it again.

I know you already solved the problem, but hey, what's another example?

Code:

char * printcheck(char buffer[], char number[])
{
 char * hundreds_n_ones[] = 
 {
  "", 
  "One ", 
  "Two ", 
  "Three ", 
  "Four ", 
  "Five ", 
  "Six ", 
  "Seven ", 
  "Eight ", 
  "Nine " 
 };
 
 char * specials[] = 
 {
  "Ten ", 
  "Eleven ", 
  "Twelve ",
  "Thirteen ", 
  "Fourteen ", 
  "Fifteen ", 
  "Sixteen ", 
  "Seventeen ", 
  "Eighteen ", 
  "Nineteen " 
 };
 
 char * tens[] = 
 {
  "",
  "", 
  "Twenty ", 
  "Thirty ",
  "Forty ", 
  "Fifty ", 
  "Sixty ", 
  "Seventy ", 
  "Eighty ", 
  "Ninety " 
 };
 
 char * levels [] = 
 {
  "",
  "Thousand ", 
  "Million ", 
  "Billion ",
  "Trillion ", 
  "Quadrillion ", 
  "Quintillion ", 
  "Sextillion ", 
  "Septillion ", 
  "Octillion ", 
  "Nintillion ",
  "Lots " 
 };
 
 buffer[0] = 0;
 
 int length = strlen(number);
 
 if(length == 0) return buffer;
  
 int digit, mode, level, place = length;
 
 bool special = false;

 int max_level_index = sizeof(levels)/sizeof(levels[0])-1;
 
     for(int i = 0; i < length; ++i, --place)
   {
    digit = number[i]-'0';
    
    mode = place%3;
     
       if(mode == 1)
      {
          if(special)
         {  
          special = !special;
          
          strcat(buffer, specials[digit]); 
         }
          else
           strcat(buffer, hundreds_n_ones[digit]);
           
       level = (place-1)/3;
         
          if(level)
         {
             if(level > max_level_index)
              level = max_level_index;
          
          digit = level;
          
          strcat(buffer, levels[digit]);                    
         }      
      }       
       else if(mode == 2)
      {
          if(digit == 1)
           special = true;
          else
           strcat(buffer, tens[digit]);
      }       
       else if(mode == 0)
      {
       strcat(buffer, hundreds_n_ones[digit]);
       
       strcat(buffer, "Hundred ");
      } 
   }
  
 return buffer;
}

Originally posted by denizengt The problem I am having is, when I find the "million" term for instance, how do I retrieve the 1 to 3 words that occur before it, (and hence pass them to my "word lists" and retrieve the int equivalent to add) ?

I'll try this for the third time....

If you found MILLION, copy everything from the beginning of he string to MILLION into a temp array, and process that array.

Then skip over MILLION, remember this position 'p' and search for THOUSAND. Repeat above from 'p' to the THOUSAND.