Question

You work for a bank that has a program with a dependency of the account class. Unfortunately the hard drive that contained the source code for the account class went bad and no backup can be found. Obviously, this means you bank needs to address this issue. However, your task is to recreate the account class. The good news is that your company was able to locate a tester of the account class and one helper function to output the class. Using these two files, you should be able to re-engineer account.h and account.cpp to work as originally designed.

Implement the account class.

main.cpp:

#include <iostream>
#include "account.h"
#include "account_output.h"
using namespace std;
using namespace DS;

int main() {

    cout << "Account Tester" << std::endl;

    //Create an account with 3.0% interest rate
    account savings(0.03);
    //Deposit one dollar
    savings.deposit(1.00);
    //Account should have exactly $1 in it
    cout << savings << endl;

    //Move up a week
    savings.advanceDay(7);
    cout << savings << endl;

    //Deposit $450.55
    savings.deposit(450.55);
    cout << savings << endl;

    //Move up 23 days, should see our first compound
    //However, the average balance not 451.55, since the balance was $1 for 7 of the 30 days
    savings.advanceDay(23);
    cout << savings << endl;

    //Advance a bunch with balance unchanged, two compoudings happen
    savings.advanceDay(65);
    cout << savings << endl;

    //Deposit more
    savings.deposit(1000);
    cout << savings << endl;

    //Advance a bunch with balance unchanged, at least two more interest calculations
    savings.advanceDay(65);
    cout << savings << endl;

    //Will not mutate object, amount must be > 0
    savings.deposit(-1000);
    cout << savings << endl;

    //Will not mutate object, amount must be > 0
    savings.withdraw(-1000);
    cout << savings << endl;

    //Will not mutate object, amount must < balance
    savings.withdraw(-10000);
    cout << savings << endl;

    //lower balance by 50
    savings.withdraw(50);
    cout << savings << endl;

    savings.advanceDay(30);
    cout << savings << endl;

    return 0;
}

account_output.h: Overload of the << operator to display the balance and week number.

#ifndef PROJECT_SAVINGS_ACCOUNT_OUTPUT_H
#define PROJECT_SAVINGS_ACCOUNT_OUTPUT_H

#include <ostream>
#include <iomanip>

namespace DS {
    //Precondition: None
    //Postcondition: Output to stream, in the format of
    // day: DAYNUM, balance: $x.xx
    std::ostream &operator<<(std::ostream &, const account &);

    std::ostream &operator<<(std::ostream &os, const account &account) {
        os << "day: "
            << account.getDayNumber()
            << ", balance: $"
            << std::fixed
            << std::setprecision(2)
            << account.getBalance();
        return os;
    }
}
#endif

Due 09/17/2019 11:59pm

Answer 1

Class declarion in account.h
//account.h
#ifndef account_h
#define account_h
#include<iostream>
#include <ostream>
#include <iomanip>
using namespace std;
class account
{
private:
   int dayNumber;
   double balance;

public:
   account(double);
   void withdraw(double);
   void deposit(double);
   void advanceDay(int);
   int getDayNumber();
   double getBalance();
   friend ostream &operator<<(ostream &, const account &);
};
#endif account_h

---------------------------------------------------------------------------------

class implementation file, account.cpp

//account.cpp
#include<iostream>
#include"account.h"
using namespace std;
//constructor to set balance
account::account(double bal)
{
   //set balance and dayNumber to 1
   balance=bal;
   dayNumber=1;
}
//withdraw method
void account::withdraw(double amt)
{
   if(balance>amt)
       balance=balance-amt;
}
//deposit method
void account::deposit(double amt)
{
   balance=balance+amt;
}
//Method to advance the dayNumber with integer,num
void account::advanceDay(int num)
{
   dayNumber=dayNumber+num;
}
//Return dayNumber value
int account::getDayNumber()
{
   return dayNumber;
}
//Return balance
double account::getBalance()
{
   return balance;
}
//Overloaded extraction << operator to print dayNumber and balnace with two decimal places
ostream &operator<<(ostream &os, const account &account)
{
   os << "day: "
       << account.dayNumber
       << ", balance: $"
       << std::fixed
       << std::setprecision(2)
       << account.balance;
   return os;
}

---------------------------------------------------------------------------------

//Tester program for account.h class
//main.cpp:
#include <iostream>
#include "account.h"
using namespace std;
int main()
{

   cout << "Account Tester" << std::endl;
   //Create an account with 3.0% interest rate
   account savings(0.03);
   //Deposit one dollar
   savings.deposit(1.00);
   //Account should have exactly $1 in it
   cout << savings << endl;

   //Move up a week
   savings.advanceDay(7);
   cout << savings << endl;

   //Deposit $450.55
   savings.deposit(450.55);
   cout << savings << endl;

   //Move up 23 days, should see our first compound
   //However, the average balance not 451.55, since the balance was $1 for 7 of the 30 days
   savings.advanceDay(23);
   cout << savings << endl;

   //Advance a bunch with balance unchanged, two compoudings happen
   savings.advanceDay(65);
   cout << savings << endl;

   //Deposit more
   savings.deposit(1000);
   cout << savings << endl;

   //Advance a bunch with balance unchanged, at least two more interest calculations
   savings.advanceDay(65);
   cout << savings << endl;

   //Will not mutate object, amount must be > 0
   savings.deposit(-1000);
   cout << savings << endl;

   //Will not mutate object, amount must be > 0
   savings.withdraw(-1000);
   cout << savings << endl;

   //Will not mutate object, amount must < balance
   savings.withdraw(-10000);
   cout << savings << endl;

   //lower balance by 50
   savings.withdraw(50);
   cout << savings << endl;

   savings.advanceDay(30);
   cout << savings << endl;

   system("pause");
   return 0;
}

---------------------------------------------------------------------------------

Sample Output: