Design a class Numbers that can be used to translate whole dollar amounts in the

Question

Design a class Numbers that can be used to translate whole dollar amounts in the range 0 through 9999 into a English description of the number
Also, demonstrate the class by writing a main program that loops asking the user to enter a number in the proper range and then prints its English description
this class should have a single integer member variable

int num;

and a collection of static string members that specify how to translate key dollar amounts into the desired format. per example :

static string lessThan20[] = {"zero", "one", ..., "nineteen" };
static string hundred = "hundred";
static string thousand = "thousand";

the class should have a constructor that accepts a non-negative integer and uses it to initialize the Numbers object. It should have a a member function print() that prints the English description of the Numbers object;

Explanation / Answer

//Numbers.h

#include <iostream>
#include <string>
using namespace std;

#ifndef NUMBERS_H
#define NUMBERS_H

class Numbers
{
public:
   Numbers(int = 0);
   ~Numbers();
   void print() const;
private:
   static const string LESS_THAN_20[];
   static const string TENS[];
   static const string HUNDRED;
   static const string THOUSAND;
   int num;
};
#endif

//Numbers.cpp

#include "Numbers.h"

const string Numbers::LESS_THAN_20[] = {
   "zero", "one", "two", "three", "four",
   "five", "six", "seven", "eight", "nine",
   "ten", "eleven", "twelve", "thirteen", "fourteen",
   "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"
};
const string Numbers::TENS[] = {
   "twenty", "thirty", "forty", "fifty", "sixty",
   "seventy", "eighty", "ninety"
};
const string Numbers::HUNDRED = "hundred";
const string Numbers::THOUSAND = "thousand";

//---------------------------------------
Numbers::Numbers(int num)
:num(num)
{
   if (this->num > 9999 || this->num < 0)
      this->num = 0;
}
//---------------------------------------
Numbers::~Numbers()
{
}
//---------------------------------------
void Numbers::print() const
{
   if (!num)
      cout << LESS_THAN_20[num];
   else
   {
      int firstDigit = num / 1000;
      int secondDigit = num / 100 % 10;
      int thirdDigit = num / 10 % 10;
      int fourthDigit = num % 10;

      if (firstDigit)
         cout << LESS_THAN_20[firstDigit] << " " << THOUSAND;
      if (secondDigit)
         cout << (firstDigit ? " " : "")
              << LESS_THAN_20[secondDigit] << " " << HUNDRED;
      if (thirdDigit || fourthDigit)
      {
         cout << (secondDigit ? " " : (firstDigit ? " " : ""));
         if (firstDigit || secondDigit)
         {
            if (!thirdDigit
               || (num % 100 == 10 || num % 100 == 12)
               || (!secondDigit && firstDigit))
               cout << "and ";
         }
         if (thirdDigit < 2)
            cout << LESS_THAN_20[thirdDigit * 10 + fourthDigit];
         else if (fourthDigit)
            cout << TENS[thirdDigit - 2] << " " << LESS_THAN_20[fourthDigit];
         else
            cout << TENS[thirdDigit - 2];
      }
   }
}

//TestDriver.cpp

#include <iostream>
#include "Numbers.h"
using namespace std;

int main()
{
   Numbers test0;
   cout << "0 = ";
   test0.print();
   cout << endl;

   Numbers test1(8);
   cout << "8 = ";
   test1.print();
   cout << endl;

   Numbers test2(18);
   cout << "18 = ";
   test2.print();
   cout << endl;

   Numbers test3(30);
   cout << "30 = ";
   test3.print();
   cout << endl;

   Numbers test4(45);
   cout << "45 = ";
   test4.print();
   cout << endl;

   Numbers test5(100);
   cout << "100 = ";
   test5.print();
   cout << endl;

   Numbers test6(304);
   cout << "304 = ";
   test6.print();
   cout << endl;

   Numbers test7(289);
   cout << "289 = ";
   test7.print();
   cout << endl;

   Numbers test8(8000);
   cout << "8000 = ";
   test8.print();
   cout << endl;

   Numbers test9(9563);
   cout << "9563 = ";
   test9.print();
   cout << endl;

   Numbers test10(7050);
   cout << "7050 = ";
   test10.print();
   cout << endl;

   Numbers test11(3480);
   cout << "3480 = ";
   test11.print();
   cout << endl;

   Numbers test12(12);
   cout << "12 = ";
   test12.print();
   cout << endl;

   Numbers test13(6007);
   cout << "6007 = ";
   test13.print();
   cout << endl;

   Numbers test14(-7);
   cout << "-7 = ";
   test14.print(); //should print zero (negative value)
   cout << endl;

   Numbers test15(62007);
   cout << "62007 = ";
   test15.print(); //should print zero (>9999)
   cout << endl;

   return 0;
}

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