#include <string>
#include <exception>
#include <vector>
#include <iostream>

using namespace std;

class account {
	string nm;
	long bal; // balance is in pennies (or smaller)

public:
	// account(string n) : nm(n), bal(0) {}
	account(string n, long initial_bal = 0) :
		nm(n), bal(initial_bal) {
                   // check the invariant!
                   if (nm == "" || bal < 0)
                   	throw runtime_error("account(): invalid parameters");
	}

	string name() const { return nm; }
	long balance() const { return bal; }

	long deposit(long amount) { // can also do withdraw
		// check the invariant!
		account tmp(nm, bal+amount);
		bal = tmp.bal;
		return bal;
	}

	long withdraw(long amount) {
		return deposit(-amount); // re-use code, don't copy-paste!!!
	}
};

class bank {
	vector<account> bank_accounts;

public:
	void add_account(const account &acct) {
		bank_accounts.push_back(acct);
	}

	void print_accounts() const {
		// Bad: Calls size in each loop iteration.
		// for (int i = 0; i < bank_accounts.size(); i++) {
		// Good: calls size() only once!
		for (int i = 0, sz = bank_accounts.size(); i < sz; i++) {
			const account &acct = bank_accounts[i];
			cout << acct.name() << ": " <<
				acct.balance() << '\n';
		}
	}

	void deposit(string nm, long amount) {
		for (int i = 0, sz = bank_accounts.size(); i < sz; i++)
			if (bank_accounts[i].name() == nm)
				bank_accounts[i].deposit(amount);
	}

	void withdraw(string nm, long amount) {
		deposit(nm, -amount);
	}

	void add_interest(long rate) {
		for (int i = 0, sz = bank_accounts.size(); i < sz; i++) {
			account &acct = bank_accounts[i];
			acct.deposit(acct.balance() * rate / 100);
		}
	}
};

int main() {
  bank rbs;

  account mickey("Mickey Mouse");
  account donald("Donald Duck", 30);

  rbs.add_account(mickey);
  rbs.add_account(donald);
  rbs.add_account(account("Pluto", 10000));

  rbs.print_accounts();

  rbs.deposit("Mickey Mouse", 10);
  rbs.withdraw("Donald Duck", 10);

  rbs.print_accounts();
   
  rbs.add_interest(25);
  rbs.print_accounts();
 
  rbs.add_interest(-500);		// blow up 
  rbs.print_accounts();
 
  return 0;
}