savings with statics c++

I'm learning how to use static members/functions and what the question provided I've came up with this so far. When I run this code I get the follow message

Quote:

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Error 1 error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'void' (or there is no acceptable conversion)

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i changed around some settings trying to see if I could fix it when i changed my print to a double this error would go away but then i'd get some linker error. i went the the MS place to see if i could understand the error better but no like. Any help would be great

Code:

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header file:
class SavingsAccount
{
public:

  SavingsAccount( double, double );
  void setAnnualInterestRate( double );
  void calculateMonthlyInterest();
  static void modifyInterestRate( double );
  void print();
private:
  double savingsBalance;
  static double annualInterestRate;
};
body:
#include <iostream>
#include <iomanip>
using namespace std; 
#include "savings.h"

double SavingsAccount::annualInterestRate = 0.0; //inital rate
 
SavingsAccount::SavingsAccount( double bal, double annual )
{
  savingsBalance = ( bal >= 0.0 ? bal : 0.0 );
  setAnnualInterestRate( annual );
}
 
void SavingsAccount::setAnnualInterestRate( double annual)
{
  annualInterestRate = ( annual >= 0.0 && annual <= 1.0) ? annual : .03;
}

void SavingsAccount::calculateMonthlyInterest()
{
  savingsBalance += savingsBalance * ( annualInterestRate / 12);
}
void SavingsAccount::modifyInterestRate( double interest )
{
  annualInterestRate = (interest >= 0.0 && interest <= 1.0) ? interest : .04;
}

void SavingsAccount::print()
{
  cout << setprecision(2) << "$" << savingsBalance;
 
}
int Main()
{
SavingsAccount server1(2000,.03);
SavingsAccount server2(3000,.03);

       
cout << "Initial Balance For server1 Is: " << server1.print();
cout << "\nInitial Balance For server2 Is: " << server2.print() <<  "\n\n";
system("PAUSE");
return 0;
};

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Code:

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cout << "Initial Balance For server1 Is: " << server1.print();
cout << "\nInitial Balance For server2 Is: " << server2.print() <<  "\n\n";

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For it to work the way you've got things now, you probably want:

Code:

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cout << "Initial Balance For server1 Is: ";
server1.print();
cout << "\nInitial Balance For server2 Is: ";
server2.print();
cout << "\n\n";

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Otherwise you'll need to overload operator<< for your class for that to work as you were attempting. The basic problem is that your print function returns a void and you're attempting to print that void for which there is no operator<< defined.

cool thanks, how does one overload cout tho if i wanted to do that?

An example of the basic structure for overloading operator<< for a class:

Code:

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class foo
{
    int blah;
public:
    std::ostream& print(std::ostream& os) const;
};

// Public "print" member function
std::ostream& foo::print(std::ostream& os) const
{
    return os << blah;
}

// Overload operator<< for objects of type foo, calls foo's public print member function
std::ostream& operator<<(std::ostream& os, const foo& rhs)
{
    return rhs.print(os);
}

int main()
{
    foo bar;

    // Call overloaded operator<< for objects of type foo
    std::cout << bar << std::endl;

    return 0;
}

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It's missing stuff like constructors and methods to get/set the blah data member but that's the general idea.