Thread: Savings Account class

Alright I had everything working until I started to incorporate my interst rate I'll post my header and cpp to see if anyone can steer me straight.

This is the error and I've tried tinkering quite a bit with no avail:
error LNK2001: unresolved external symbol "private: static double SavingsAccount::annualInterestRate" (?annualInterestRate@SavingsAccount@@0NA)
1>c:\Project2\Debug\Project2.exe : fatal error LNK1120: 1 unresolved externals

Code:

#include "SavingsAccount.h"
#include <iostream>
#include <iomanip>
#include <fstream>

using namespace std;
extern ofstream fileout;

// constructor function with 0 parameters

SavingsAccount::SavingsAccount()
{
 setFirstName("");
 setLastName ("");
 setBalance (0.0);
 setInterestRate (.05);
}

// constructor functions with 1 parameter

SavingsAccount::SavingsAccount (string first, string last )
{
 setFirstName (first);
 setLastName (last);
 setBalance (0.0);
 setInterestRate (.05);
}

// constructor function with 2 parameters

SavingsAccount::SavingsAccount(string first, string last, double balance)
{
 setFirstName (first);
 setLastName (last);
 setBalance (balance);
 setInterestRate (.05);
}

 // calculate balance
double SavingsAccount::calcNewBalance() 
{
 monthlyRate = annualInterestRate/12;
 return (monthlyRate * savingBalance) + savingBalance;
}

// set functions
void SavingsAccount::setInterestRate(double rate)
{
 annualInterestRate = rate;
}

void SavingsAccount::setFirstName(string f)
{
 firstName = f;
}

void SavingsAccount::setLastName(string l)
{
 lastName = l;
}

// set balance
void SavingsAccount::setBalance (double b)
{
 savingBalance = b;
 
}

// get functions
double SavingsAccount::getInterestRate(double rate)
{
 return annualInterestRate;
}

string SavingsAccount::getFirstName() 
{
 return firstName;
}

string SavingsAccount::getLastName() 
{
 return lastName;
}

// get balance
double SavingsAccount::getBalance() const
{
 return savingBalance;
}

// print function
void SavingsAccount::printData()
{
 cout<< "\nName: " << firstName <<" "<< lastName;
 cout<< "\nBalance: " << savingBalance;
 cout<< "\nNew Balalce: " << calcNewBalance();
}

Code:

//SavingsAccount.h
//Defintion of class SavingsAccount
#ifndef SAVINGSACCOUNT_H
#define SAVINGSACCOUNT_H

#include <string>
using namespace std;

class SavingsAccount
{
public:

 //overloaded constructor functions
 SavingsAccount ();
 SavingsAccount (string, string);
 SavingsAccount (string, string, double);
 
 //set functions
 void setFirstName ( string );
 void setLastName ( string );
 void setBalance ( double );
 void static setInterestRate ( double );
 
 //get functions
 string getFirstName();
 string getLastName();
 double getBalance() const;
 static double getInterestRate (double);

 //calculation functions
 double calcNewBalance();

 //print functions
 void printData();

private:

 string firstName;
 string lastName;
 double savingBalance;
 double monthlyRate;
 static double annualInterestRate;
 int objectnumber;
 
};
#endif

Where are you initializing annualInterestRate? You must initialize this variable somewhere outside the class definition.

Jim

Ah thanks I missed that. I'm struggling to get my destructor to work. It should let the user know the object no longer exists.

header file

Code:

//destructor
    ~SavingsAccount();

.cpp code

Code:

//destructor
SavingsAccount::~SavingsAccount()
{
cout << "Object " << objectnumber << "no longer exists"<<endl;

fileout << "Object " << objectnumber << "no longer exists" <<endl;
}

No error, just no output

Show how you are using the class.

Jim

Main

Code:

#include <iostream>
#include <iomanip>
#include <fstream>
#include "SavingsAccount.h"

using namespace std;
ofstream fileout;

int main()
{
 fileout.open("F:\\SavingsOut.txt");
 
 // declare objects
 SavingsAccount Saver1 ("Margaret", "Olson", 2000, 1);
 SavingsAccount Saver2 ("Debra", "Baxter", 2);
 SavingsAccount Saver3 ("","",3);
 
 Saver1.printData();
 Saver2.printData();
 Saver3.printData();
 
 // set new parameters for Saver2
 Saver2.setBalance (5000);
 
 // set new parameters for Saver3
 Saver3.setFirstName ("Arturo");
 Saver3.setLastName ("Ortiz");
 Saver3.setBalance (10000);
 
 // print new data for the objects
 cout<<"\n\nNew data for Saver 2:";
 fileout<<"\n\nNew data for Saver 2:";
 Saver2.printData();
 
 cout<<"\n\nNew data for Saver 3:";
 fileout<<"\n\nNew data for Saver 3:";
 Saver3.printData();
 
 int c;
 cin>> c;
}

You won't usually see the destructor working when it goes out of scope of the main() function. If you put it in a block you will probably be able to see it work. Or call create your class in another function.

Code:

int main()
{

   {
      SavingsAccount Saver1 ("Margaret", "Olson", 2000, 1);
   }

   return(0);
}

Jim