// File: savingAccount.h
// savingAccount header file
#include "account.h"
class savingAccount : public account   // this is inherited from account
{
protected:
   double rate;   // decimal periodic interest rate
public:
   savingAccount(double bal, double pct);
   double compound(void);   // compute and deposit interests
   double withdraw(double amt);
};
// File: savingAccount.cpp
// implementation file for the savingAccount class
#include "savingAccount.h"
savingAccount::savingAccount(double bal, double pct) : account(bal)
{
   rate = pct / 100.0;
}

double savingAccount::compound(void)
{
    double interest = rate * balance;
    balance += interest;
    return interest;
}

double savingAccount::withdraw(double amt)
{
   if (amt <= balance)
   {
      balance -= amt;
      return amt;
   }
   else
      return 0;
}
// File: checkingAccount.h
// header file for the checkingAccount class
#include "account.h"
class checkingAccount : public account  // inherits from account class
{
protected:
   double limit;      // lower limit for free checking
   double charge;     // per-check charge for low balance
public:
   checkingAccount(double bal, double lim, double chg);
   double cashCheck(double amt);
};
// File: checkingAccount.cpp
// implementation file for class checkingAccount
#include "checkingAccount.h"
checkingAccount::checkingAccount( double bal, 
                                  double lim, 
                                  double chg) : account( bal )
{
   limit = lim;
   charge = chg;
}

double checkingAccount::cashCheck(double amt)
{
   if ((balance < limit) && (amt + charge <= balance))
   { 
      balance -= amt + charge;
      return amt + charge;
   }
   else if ((balance >= limit) && (amt <= balance))
   {
      balance -= amt;
      return amt;
   }
   else
      return 0.0;
}