Thread: Operator Overloading Help

The program worked fine before implemeting operator overloading, demonstrated in objects #1-3.

The goal is to add 4 overloaded operators as following:
>>read new name and balance from keyboard and update the object's data
<< display the info for the object
+= increase balance
-= decrease balance


Now, when I run my program. Only the info for object 4 shows and it does not output a second time after adding 1000 to the total.

Anything criticism and guidance is appreciated.

Code:

#include <iostream>
#include <iomanip>
#include <fstream>
#include <conio.h>
#include "SavingsAccount.h"
using namespace std;
ofstream fileout;
int main()
{
 fileout.open("E:\\SavingsOut.txt");      
 
 SavingsAccount Saver4 ("John", "Claude", 3250, 4);     
       
 cout << Saver4 << endl; 
 cin >> Saver4;
 Saver4 += 1000;
 cout << Saver4 << endl;
 // 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<<"\nNew data for Saver 2:";
 fileout<<"\nNew data for Saver 2:";
 Saver2.printData();
 
 cout<<"\nNew data for Saver 3:";
 fileout<<"\nNew data for Saver 3:";
 Saver3.printData();
 cout<<"\nPress any key to continue.\n"<<endl;
 getch();
 
}

Code:

#include "SavingsAccount.h"
#include <iostream>
#include <iomanip>
#include <fstream>
using namespace std;
extern ofstream fileout;
double SavingsAccount::annualInterestRate = 0.00;
// constructor function with 0 parameters
SavingsAccount::SavingsAccount(int serial):objectnumber (serial)
{
 setFirstName("");
 setLastName ("");
 setBalance (0.0);
 setInterestRate (.05);
 
}
// constructor functions with 1 parameter
SavingsAccount::SavingsAccount (string first, string last, int serial ):objectnumber (serial)
{
 setFirstName (first);
 setLastName (last);
 setBalance (0.0);
 setInterestRate (.05);
 
}
// constructor function with 2 parameters
SavingsAccount::SavingsAccount(string first, string last, double balance, int serial):objectnumber (serial)
{
 setFirstName (first);
 setLastName (last);
 setBalance (balance);
 setInterestRate (.05);
 
}
//destructor
SavingsAccount::~SavingsAccount()
{
 cout<< "Object " << objectnumber << " no longer exists" <<endl;
 fileout<< "Object " << objectnumber << " no longer exists" <<endl;
}
// calculate balance
double SavingsAccount::calcNewBalance() 
{
 monthlyRate = annualInterestRate/12;
 return (monthlyRate * savingBalance) + savingBalance;
}

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()
{
 return annualInterestRate;
}
int SavingsAccount::getObjectNumber () const
{
 return objectnumber;
}
string SavingsAccount::getFirstName() 
{
 return firstName;
}
string SavingsAccount::getLastName() 
{
 return lastName;
}
// get balance
double SavingsAccount::getBalance() const
{
 return savingBalance;
}
//overloaded functions
istream& operator>> (istream &cin, SavingsAccount &Saver4)
{
 string f, l;
 double s;
 
 cin >> f >> l >> s;
 Saver4.firstName = f;
 Saver4.lastName = l;
 Saver4.savingBalance = s;
 return cin;
 
}
ostream& operator<< (ostream &out, SavingsAccount &Saver4)
{
 cout << Saver4.getFirstName() << " " << Saver4.getLastName() << " " << Saver4.getBalance();
 return cout;
}
void SavingsAccount::operator += (double b)
{
 savingBalance += b;
}
void SavingsAccount::operator -= (double b)
{
 savingBalance -= b;
}
// print function
void SavingsAccount::printData()
{
 cout<< "\nSerial Number: " << objectnumber;
 cout<< "\nName: " << firstName <<" "<< lastName;
 cout<< "\nBalance: " << savingBalance;
 cout<< "\nNew Balalce: " << calcNewBalance()<<endl;
 fileout<< "\nSerial Number: " << objectnumber;
 fileout<< "\nName: " << firstName <<" "<< lastName;
 fileout<< "\nBalance: " << savingBalance;
 fileout<< "\nNew Balalce: " << calcNewBalance();
}

Code:

#ifndef SAVINGSACCOUNT_H
#define SAVINGSACCOUNT_H
#include <string>
using namespace std;
class SavingsAccount
{
public:
 //overloaded constructor functions
 SavingsAccount (int);
 SavingsAccount (string, string, int);
 SavingsAccount (string, string, double, int);
 //destructor
 ~SavingsAccount();
 
 //set functions
 void setFirstName ( string );
 void setLastName ( string );
 void setBalance ( double );
 
 void static setInterestRate ( double );
 
 //get functions
 string getFirstName();
 string getLastName();
 double getBalance() const;
 int getObjectNumber () const;
 static double getInterestRate ();
 //calculation functions
 double calcNewBalance();
 //print functions
 void printData();
 //overloaded functions
 friend std::ostream& operator<< (ostream &, SavingsAccount&);
 friend std::istream& operator>> (istream &, SavingsAccount&); 
 void operator += (double);
 void operator -= (double);
private:
 string firstName;
 string lastName;
 double savingBalance;
 double monthlyRate;
 static double annualInterestRate;
 const int objectnumber;
 
};
#endif

Ah, I fixed the problem with none of the other object's running their task by declaring Saver4 after 3 and running through the task that way.

Saver4 only shows "John Claude 3250" once and does not update the balance when I call Saver4 += 1000;

Also, is there a way to allow the user to input John Claude 3250 from the keyboard and run it that way?

I fixed the problem with none of the other object's running their task by declaring Saver4 after 3 and running through the task that way.

O_o

I don't know what it is in your case, but in general, if the order of declaration changes the observable effects of a program that are unrelated to constructor you have something very wrong.

By the by, would you be kind enough to tell us where you got this project example?

C++ calls it like so

O_o

This would be closer:

Code:

operator << (operator << (cout, saver), endl);

Soma

Phantom,

The project has been filled out by me. Although this site did help with the debugging along with my professor. He assigned for us to not change code we had previously but add in the overloaded operators.

Can anyone see to as any reason as why my addition/subtraction operators do not work? Nor do the cout(s) after I call those functions.

You need to take note of what I said. Your input and output operators are wrong -- you do not use all of the parameters which are passed in, which is bound to cause issues.

If we take a look at the code:

Code:

 fileout.open("E:\\SavingsOut.txt");     
  
 SavingsAccount Saver4 ("John", "Claude", 3250, 4);    
        
 cout << Saver4 << endl;
 cin >> Saver4;
 Saver4 += 1000;
 cout << Saver4 << endl;

It can technically fail on lines before we get to add 1000. A quick run through the debugger confirms that we do not reach the line that you say is the problem.

Whiteflags, I get what you're saying now it just took a minute to resonate. I actually have the arithmetic operators working correctly as well.

As my code is currently constructed and how I declare my object in main, if I'm not mistaken I don't see any use for cin.

How would I go about declaring a 4th object and then allowing the user to enter the name/balance for that object and then perform the given tasks upon them?

As my code is currently constructed and how I declare my object in main, if I'm not mistaken I don't see any use for cin.

It will be used under the condition that you have to get input from the keyboard.

How would I go about declaring a 4th object and then allowing the user to enter the name/balance for that object and then perform the given tasks upon them?

These are separate tasks, actually. To answer the first part of the question, declare a default constructor for Savings Accounts. Then this is possible:

Code:

SavingsAccounts newAcct;
cout << "Please enter your name followed by your initial deposit: ";
cin >> newAcct;

From there manipulating the account happens as normal.

Updated calls

Code:

operator << (cout, Saver4);

Saver4 += 1000;
operator << (cout, Saver4);

Saver4 -= 1000;
operator << (cout, Saver4);

Wow that simple, I over complicated things in my head I guess.

I went ahead and used my construtor that declares a serial number only for the user and then asked for the info. But thanks all for clearing up my confusions with overloading.

O_o

Code:

ostream& operator<< (ostream &out, SavingsAccount &Saver4)
{
 cout << Saver4.getFirstName() << " " << Saver4.getLastName() << " " << Saver4.getBalance();
 return cout;
}

cout is just one ostream of many. out actually refers to any of them, in particular, the one being used at the moment, whether it is cout, or another file or perhaps even a network stream, or...

And:

Code:

//overloaded functions
istream& operator>> (istream &cin, SavingsAccount &Saver4)
{
 string f, l;
 double s;
  
 cin >> f >> l >> s;
 Saver4.firstName = f;
 Saver4.lastName = l;
 Saver4.savingBalance = s;
 return cin;
 }

cin is one example of a whole class.

The example I wrote which you reproduced was meant for your understanding. I wanted to communicate that when you called the operator function, the parameters would be filled with arguments, in fact dictating where the ultimate results go (or come from, as in the case of input). It is not necessary to change how these statements are written. This is my fault for not explaining this properly.

O_o

*gasp*

THAT'S MY LINE!

Soma