trip_cost_computation.cpp

#include <iostream>
#include <string>

const double trip_cost = 5000.0; // dollars

int main()
{
  // Compute exchange rate deltas (using russian trader BCS for money exchange)
  const double e_sell_today = 69.19;
  const double e_buy_today = 67.20;
  const double e_off_today = 68.43;
  const double d_sell_bcs = e_sell_today - e_off_today;
  const double d_buy_bcs = e_buy_today - e_off_today;
  const double e_te = 70.14;
  const double d_te = e_te - e_off_today;
  
  double e1,e2,e3;
  std::cout << "Input exchange rate at the day you would buy trip via tour agency: ";
  std::cin >> e3;
  std::cout << "Input exchange rate at the day you would buy dollars via BCS: ";
  std::cin >> e1;
  std::cout << "Input exchange rate at the day you would sell dollars via BCS: ";
  std::cin >> e2;
  
  std::cout << "-------------------------------------\n";
  
  double cost_without_exchange = trip_cost * (e3 + d_te);
  std::cout << "1) Trip cost without any money exchange: " << cost_without_exchange << " rubles\n";
  
  double trip_cost_rubles = trip_cost * (e2 + d_te); // rubles
  double dollars_need_to_buy_trip = trip_cost_rubles / (e2 + d_buy_bcs); // dollars in bank
  double rubles_need_to_buy_dollars = dollars_need_to_buy_trip * (e1 + d_sell_bcs) + 1000.0;
  std::cout << "2) Trip cost with money exchange: " << rubles_need_to_buy_dollars << " rubles\n";
}