/* Simple bank account using structs and C pointers for 
 * passing structures "by reference."
 * 
 * The code for Deposit() and Withdrawal() is somewhat 
 * ugly due to the need to dereference a pointer before 
 * accessing a structure variable.
*/

#include <iostream>
using namespace std;

struct Account {
  char   *firstName;
  char   *lastName;
  int    number;
  double balance;
};

void Deposit(Account *act, double amount);
void Withdrawal(Account *act, double amount);
double Balance(Account act);
void PrintInfo(Account act);

int main() {

  Account act;

  // Initialize account

  act.firstName = "Chris";
  act.lastName = "Marron";
  act.number = 14314;
  act.balance = 0.0;

  // Good programmer!  Uses defined functions
  // that include error checking

  PrintInfo(act);

  Deposit(&act, 100.0);

  cout << "Balance is " << Balance(act) << endl;

  Withdrawal(&act, 150.0);

  cout << "Balance is " << Balance(act) << endl << endl;

  // Bad programmer!  Bypasses error checking
  // Can't stop this with structs

  act.balance -= 150.0;

  cout << "Balance is " << Balance(act) << endl;

  return 0;
}

void Deposit(Account *act, double amount) {

  // could add loging, etc.

  if (amount > 0.0) 
    act->balance += amount;
  else
    cerr << "Deposit: amount must be positive." << endl;
}    

void Withdrawal(Account *act, double amount) {

  // could add loging, etc.

  if (amount > 0.0) 
    if (amount <= act->balance)
      act->balance -= amount;
    else
      cerr << "Withdrawal: insufficient funds." << endl;
  else
    cerr << "Withdrawal: amount must be positive." << endl;
}    

double Balance(Account act) {

  // could add loging, etc.

  return act.balance;
}

void PrintInfo(Account act) {
  cout << "Account number: " << act.number << endl;
  cout << "Owner: " << act.firstName << " " << act.lastName << endl;
  cout << "Balance: " << act.balance << endl << endl;
}