Narkoman Studio

#include <iostream>
#include <cmath>
#include <sstream>

using namespace std;

class Client {
  private:
    string id;
    float balance;

  //constructor
  public:
    Client(string id, float balance) {
      this->id = id;
      this->balance = balance;
    }

  public:
    string toString() {
      stringstream ss;
      ss << "Id: " << id << "\n";
      ss << "Balance (PLN): " << balance << "\n";
      ss << "Balance (EUR): " << balance * Client::exRate << "\n";
      return ss.str();
    }

  /* static */
  public:
    static float exRate;
  public:
    static void setExRate(float exRate) {
      Client::exRate = exRate;
    }
};
float Client::exRate = 2.43;

int main() {
  Client clients[] = {
    Client("123", 3094.23),
    Client("121234334", 4373),
    Client("32765", 0.31),
    Client("126589234", 22.23),
    Client("867679", 295.29)
  };
  int size = sizeof(clients) / sizeof(clients[0]);
  for(int i = 0; i < size; i++) {
    cout << clients[i].toString() <<endl;
  }

    Client::setExRate(3.15);

  for(int i = 0; i < size; i++) {
    cout << clients[i].toString() <<endl;
  }

  return 0;
}