Undeclared Identifier error #C2065

[teddarr]

I am trying to construct a class with several functions and identifiers. The identifier in question is static double AIR which will hold the value of the annual interest rate in the class.

I have been getting an error message that I can't seem to get rid of:

error C2065: 'AIR' undeclared identifier

I have never worked with static identifiers before and I think I'm leaving something out somewhere but I don't know what.

Here's the header and .cpp files:

Any Ideas?

#ifndef SAVINGSACCOUNT_H
#include <iostream>

using namespace std;

class SavingsAccount
{
public:
	SavingsAccount(int objn, double rate);
	SavingsAccount(int objn, string fn, string ln, double rate);
	SavingsAccount(int objn, string fn, string ln, double bal, double rate);
	void setName(string, string);
//	string getName() const;
	string getFirstName();// const;
	string getLastName();// const;
	void setBalance(double);
	double getBalance();// const;
	static void setInterestRate(double);
	static double getInterestRate();
	int getNumber();// const;
	double calculateNewBalance(double oldBalance);
	~SavingsAccount();
	
private:
	string firstName;
	string lastName;
	double savingBalance;
	
//	const int objectnumber;	
	int objectnumber;

	static double AIR;
};

#endif

#include <iostream>
#include <iomanip>

using namespace std;

#include "SavingsAccount.h"

double SavingsAccount::AIR = 0.05;

//constructor with no parameters***************
SavingsAccount::SavingsAccount(int objn, double rate)
{	
	objectnumber = objn;	
	firstName = "";
	lastName = "";
	savingBalance = 0.00;
	setInterestRate(rate);
}
//constructor with name parameters******************
SavingsAccount::SavingsAccount(int objn, string fn, string ln, double rate)
{
	objectnumber = objn;	
	setName(fn, ln);
	setBalance(0.00);
	setInterestRate(rate);
}
//constructor with name parameters and balance parameter*****
SavingsAccount::SavingsAccount(int objn, string fn, string ln, double bal, double rate)
{
	objectnumber= objn;	
	setName(fn, ln);
	setBalance(bal);
	setInterestRate(rate);
}
//void setName()*********************************
void SavingsAccount::setName(string fn, string ln)
{	
	firstName = fn;
	lastName = ln;
}
//string getName()const**************************
string SavingsAccount::getFirstName() //const
{
	return firstName;
}

string SavingsAccount::getLastName() //const
{
	return lastName;
}
//void setBalance()******************************
void SavingsAccount::setBalance(double bal)
{
	savingBalance = bal;
}
//double getBalance()const***********************
double SavingsAccount::getBalance() //const
{
	return savingBalance;
}
//static void setInterestRate()******************
//static void SavingsAccount::setInterestRate(double rate)
static void setInterestRate(double rate)
{
	AIR = rate;
}
//static double getInterestRate()****************
//static double SavingsAccount::getInterestRate()
static double getInterestRate()
{
	return AIR;
}
//getNumber()***********************************
int SavingsAccount::getNumber() //const
{
	return objectnumber;
}
//calculateNewBalance()***************************
double SavingsAccount::calculateNewBalance(double oldBalance)
{
	double newBalance = oldBalance + (oldBalance * (AIR/12));
	
	return newBalance;
}
//destructor, message: "gone out of scope"***********
SavingsAccount::~SavingsAccount()
{
	cout<<"Object "<<objectnumber<<" has gone out of scope"<<endl;
}

Thanks!

[DeMan]

is AIR a member of savings (or savingsAccount or whatever)

[teddarr]

Yes, it is.

[DeMan]

If it's private, it can't be accessed publicly?
I'm not sur eabout this, but I don't think it's visible the way that it has been declared.....An d many better brains will correct me here, I'm sure

[teddarr]

I've tried it as both private and public with the same result.

[Ganon11]

You have to refer to it as SavingsAccount: :Air, and I think it should be public.

[teddarr]

I just tried all the variations of that I can think of.

Still can't get it to work.

Any more ideas?

[horace1]

I just tried all the variations of that I can think of.

Still can't get it to work.

Any more ideas?

try defining setInterestRate () and getInterestRate () so

void SavingsAccount::setInterestRate(double rate)
{
	AIR = rate;
}

double SavingsAccount::getInterestRate()
{
	return AIR;
}

[teddarr]

horace1, I tried but it doesn't work like I need it to.

AIR is supposed to be a static data member. It's the static part that is getting me mixed up. How do I declare AIR as a static member? setInterestRate () and getInterestRate () are supposed to be static functions also.

I can't seem to get this to work right. What am I missing?

[horace1]

you declare a static data member (it name and type) within the class declaration and you define it (allocate it storage and initial value) outside the class declaration (without the keyword static). e.g.

#include <iostream>
using namespace std;

class SavingsAccount
{
public:
	static void setInterestRate(double);  // declare static member functions
	static double getInterestRate();
private:
	static double AIR;                    // declare static data member
	
};

double SavingsAccount::AIR = 0.05;        // define static data member

// define static member functions
void SavingsAccount::setInterestRate(double rate)
{
	AIR = rate;
}
double SavingsAccount::getInterestRate()
{
	return AIR;
}

// call static member functions
int main()
{
    cout << SavingsAccount::getInterestRate () << endl;
    SavingsAccount::setInterestRate (1.5);
    cout << SavingsAccount::getInterestRate () << endl;
    system("pause");
}

when run this gives
0.05
1.5
Press any key to continue . .

[teddarr]

Thank you so much. I think that is the simple, get right to it answer I've been needing.

I'll let you know how it turns out when I get a chance.

Thanks again.