Lots of stuff.

Signed-off-by: Abdulkadir Furkan Şanlı <me@abdulocra.cy>

bank.h

@@ -0,0 +1,98 @@
+#pragma once
+
+#include <ctime>
+#include <string>
+#include <vector>
+
+class Bank;
+class Client;
+class Employee;
+class Gov;
+
+class Gov
+{
+public:
+  int factor = 6;          // Money multiplier.
+  int rate = 2;            // Interest rate (%).
+  time_t last_bailout = 0; // Time since last bailout.
+  void associate (Bank *const x);
+  bool disassociate (Bank *const x);
+  double reserveDeposit (const Bank &x, const double amount);
+  double reserveWithdraw (const Bank &x, const double amount);
+  bool bailout (const Bank &x, double amount);
+
+private:
+  double bankReserves = 0;
+  std::vector<Bank *> banks;
+};
+
+class Bank
+{
+  friend class Gov;
+
+public:
+  Gov *centralBank;
+  Bank (Gov *x) : centralBank (x) { x->associate (this); };
+  double deposit (Client &x, const double amount);
+  double withdraw (Client &x, const double amount);
+  double getCurrent (const Client &x);
+  bool hire (Employee &x);
+  bool fire (Employee &x);
+  bool openAccount (Client &x);
+  bool newCredit (const std::string id, const double amount,
+                  const int installments, const int days,
+                  const float interest); // interest is additional interest on
+                                         // top of Gov rate.
+  double payInstallment (const int index);
+  void countEmployees ();
+  void listClients ();
+
+private:
+  const int CLIENT_EMPLOYEE = 2; // Max number of clients to employees.
+  double current = 0;            // Total current accts. of clients.
+  double creditable = 0;         // Amount able to be loaned to clients.
+  double credited = 0;           // Amount loaned.
+  struct creditRecord
+  {
+    time_t start;
+    long interval; // Interval of payments in number of seconds.
+    double amount;
+    int installments;
+    float interest;
+  };
+  struct clientRecord
+  {
+    std::string id;
+    double current = 0;
+    std::vector<creditRecord> loans;
+  };
+  std::vector<clientRecord> clients;
+  std::vector<Employee *> employees;
+};
+
+class Employee
+{
+  friend class Bank;
+
+public:
+  std::string name;
+  Employee (std::string x) : name (x){};
+
+private:
+  Bank *employer = nullptr;
+};
+
+class Client
+{
+  friend class Bank;
+
+public:
+  std::string id;
+  Client (std::string x) : id (x), underMattress (0){};
+  double earn (const double amount); // Earn money.
+  double getMattress ();
+
+private:
+  double underMattress;
+  std::vector<Bank *> accounts;
+};