#include <iostream.h>
#include "vector.h"
#include "CPstring.h"

// file: convert.cc
// author      Dietolf Ramm;  date: 11/10/96
// change number to English using recursion.

string Conv(int n, const Vector<string> & table)
// precondiont: n a non-negative integer
// postcondition: returns string of number in word form
{
   if (n < 10)
   {
      return table[n];
   }

   return Conv(n/10, table)+table[n%10];
}


int main()
{
   Vector<string> table(10);
   table[0] = "Zero "; table[1] = "One "; table[2] = "Two ";
   table[3] = "Three "; table[4] = "Four "; table[5] = "Five ";
   table[6] = "Six "; table[7] = "Seven "; table[8] = "Eight ";
   table[9] = "Nine ";
   int base, n;

   cout << "Enter positive integer (negative number to quit): ";
   cin >> n;
   while ( n >= 0)
   {
      cout << n << " reads: " << Conv(n, table) << endl;
      cout << "Enter positive integer (negative number to quit): ";
      cin >> n;
   }

   return 0;
}

Sample output:

convert
Enter positive integer (negative number to quit): 123
123 reads: One Two Three 
Enter positive integer (negative number to quit): 321  
321 reads: Three Two One 
Enter positive integer (negative number to quit): 87654321
87654321 reads: Eight Seven Six Five Four Three Two One 
Enter positive integer (negative number to quit): 0
0 reads: Zero 
Enter positive integer (negative number to quit): -1