PracticeDev/study_cpp/cpp_primer_source_code/Chapter 13/acctabc.cpp

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2022-12-20 17:31:11 +08:00
// acctabc.cpp -- bank account class methods
#include <iostream>
#include "acctabc.h"
using std::cout;
using std::ios_base;
using std::endl;
using std::string;
// Abstract Base Class
AcctABC::AcctABC(const string & s, long an, double bal)
{
fullName = s;
acctNum = an;
balance = bal;
}
void AcctABC::Deposit(double amt)
{
if (amt < 0)
cout << "Negative deposit not allowed; "
<< "deposit is cancelled.\n";
else
balance += amt;
}
void AcctABC::Withdraw(double amt)
{
balance -= amt;
}
// protected methods for formatting
AcctABC::Formatting AcctABC::SetFormat() const
{
// set up ###.## format
Formatting f;
f.flag =
cout.setf(ios_base::fixed, ios_base::floatfield);
f.pr = cout.precision(2);
return f;
}
void AcctABC::Restore(Formatting & f) const
{
cout.setf(f.flag, ios_base::floatfield);
cout.precision(f.pr);
}
// Brass methods
void Brass::Withdraw(double amt)
{
if (amt < 0)
cout << "Withdrawal amount must be positive; "
<< "withdrawal canceled.\n";
else if (amt <= Balance())
AcctABC::Withdraw(amt);
else
cout << "Withdrawal amount of $" << amt
<< " exceeds your balance.\n"
<< "Withdrawal canceled.\n";
}
void Brass::ViewAcct() const
{
Formatting f = SetFormat();
cout << "Brass Client: " << FullName() << endl;
cout << "Account Number: " << AcctNum() << endl;
cout << "Balance: $" << Balance() << endl;
Restore(f);
}
// BrassPlus Methods
BrassPlus::BrassPlus(const string & s, long an, double bal,
double ml, double r) : AcctABC(s, an, bal)
{
maxLoan = ml;
owesBank = 0.0;
rate = r;
}
BrassPlus::BrassPlus(const Brass & ba, double ml, double r)
: AcctABC(ba) // uses implicit copy constructor
{
maxLoan = ml;
owesBank = 0.0;
rate = r;
}
void BrassPlus::ViewAcct() const
{
Formatting f = SetFormat();
cout << "BrassPlus Client: " << FullName() << endl;
cout << "Account Number: " << AcctNum() << endl;
cout << "Balance: $" << Balance() << endl;
cout << "Maximum loan: $" << maxLoan << endl;
cout << "Owed to bank: $" << owesBank << endl;
cout.precision(3);
cout << "Loan Rate: " << 100 * rate << "%\n";
Restore(f);
}
void BrassPlus::Withdraw(double amt)
{
Formatting f = SetFormat();
double bal = Balance();
if (amt <= bal)
AcctABC::Withdraw(amt);
else if ( amt <= bal + maxLoan - owesBank)
{
double advance = amt - bal;
owesBank += advance * (1.0 + rate);
cout << "Bank advance: $" << advance << endl;
cout << "Finance charge: $" << advance * rate << endl;
Deposit(advance);
AcctABC::Withdraw(amt);
}
else
cout << "Credit limit exceeded. Transaction cancelled.\n";
Restore(f);
}