Classes and Objects Example

```//DISPLAY 10.6 /Program to demonstrate the class BankAccount.
//Demonstrates an alternative implementation of the class BankAccount.
#include <iostream>
using namespace std;

//Class for a bank account:
class BankAccount
{
public:
BankAccount(int dollars, int cents, double rate);
//Initializes the account balance to \$dollars.cents and
//initializes the interest rate to rate percent.

BankAccount(int dollars, double rate);
//Initializes the account balance to \$dollars.00 and
//initializes the interest rate to rate percent.

BankAccount( );
//Initializes the account balance to \$0.00 and the interest rate to 0.0%.

void update( );
//Postcondition: One year of simple interest has been added to the account
//balance.

double get_balance( );
//Returns the current account balance.

double get_rate( );
//Returns the current account interest rate as a percentage.

void output(ostream& outs);
//Precondition: If outs is a file output stream, then
//outs has already been connected to a file.
//Postcondition: Account balance and interest rate
//have been written to the stream outs.
private:
double balance;
double interest_rate;
double fraction(double percent);
//Converts a percentage to a fraction. For example, fraction(50.3)
//returns 0.503.

};

int main( )
{
BankAccount account1(100, 2.3), account2;

cout << "account1 initialized as follows:\n";
account1.output(cout);
cout << "account2 initialized as follows:\n";
account2.output(cout);

account1 = BankAccount(999, 99, 5.5);
cout << "account1 reset to the following:\n";
account1.output(cout);
return 0;
}

BankAccount::BankAccount(int dollars, int cents, double rate)
{
if ((dollars < 0) || (cents < 0) || (rate < 0))
{
cout << "Illegal values for money or interest rate.\n";
}
balance = dollars + 0.01*cents;
interest_rate = rate;
}

BankAccount::BankAccount(int dollars, double rate)
{
if ((dollars < 0) || (rate < 0))
{
cout << "Illegal values for money or interest rate.\n";
}
balance = dollars;
interest_rate = rate;
}

BankAccount::BankAccount( )  : balance(0), interest_rate(0.0)
{
//Body intentionally empty.
}

//Uses iostream:
void BankAccount::output(ostream& outs)
{
outs.setf(ios::fixed);
outs.setf(ios::showpoint);
outs.precision(2);
outs << "Account balance \$" << balance << endl;
outs << "Interest rate " << interest_rate << "%" << endl;
}
```

Start Project 7

This topic: SCMP118 > Main > Fall2017 > Lab7Startup
Topic revision: r1 - 2017-10-23 - JimSkon

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