#include <iostream>
#include <iomanip>
#include <string>
#include "DallarAmount.h"

using namespace std;

int main() {
   DollarAmount d1(123, 45); // $123.45
   DollarAmount d2{1576}; // $15.76

   cout << "After adding d2 (" << d2.toString() << ") into d1 ("
      << d1.toString() << "), d1 = ";
   d1.add(d2); // modifies object d1
   cout << d1.toString() << "\n";

   cout << "After subtracting d2 (" << d2.toString() << ") from d1 ("
      << d1.toString() << "), d1 = ";
   d1.subtract(d2); // modifies object d1
   cout << d1.toString() << "\n";

   cout << "After subtracting d1 (" << d1.toString() << ") from d2 ("
      << d2.toString() << "), d2 = ";
   d2.subtract(d1); // modifies object d2
   cout << d2.toString() << "\n\n";

   cout << "Enter integer interest rate and divisor. For example:\n"
      << "for     2%, enter:    2 100\n"
      << "for   2.3%, enter:   23 1000\n"
      << "for  2.37%, enter:  237 10000\n"
      << "for 2.375%, enter: 2375 100000\n> ";
   int rate; // whole-number interest rate
   int divisor; // divisor for rate
   cin >> rate >> divisor;

   DollarAmount balance{100000}; // initial principal amount in pennies
   cout << "\nInitial balance: " << balance.toString() << endl;

   cout << "\nYear" << setw(20) << "Amount on deposit" << endl;

   for (unsigned int year{1}; year <= 10; year++) {
      balance.addInterest(rate, divisor);

      cout << setw(4) << year << setw(20) << balance.toString() << endl;
   }
}



#include <string>
#include <cmath>

class DollarAmount {
public:
   explicit DollarAmount(int64_t value) : amount{value} { }

   explicit DollarAmount(int64_t dollars, int64_t cents){
     amount = ( dollars * 100 + cents ) / 100;
   }

   void add(DollarAmount right) {
      amount += right.amount;
   }

   void subtract(DollarAmount right) {
      amount -= right.amount;
   }

   void addInterest(int rate, int divisor) {
      DollarAmount interest{
         (amount * rate + divisor / 2) / divisor
      };

      add(interest);
   }

   std::string toString() const {
      std::string dollars{std::to_string(amount / 100)};
      std::string cents{std::to_string(std::abs(amount % 100))};
      return dollars + "." + (cents.size() == 1 ? "0" : "") + cents;
   }
private:
   int64_t amount{0};
};