C++ class and inheritance error: undefined reference to derived class - c++

Question

I am attempting to make part of a program that uses a bank account class as the base class and checking and savings as the derived classes. I have been trying to set up the basic framework before I do any fancy data handling and I've followed some tutorials to get a better understanding of classes and inheritance.
I have looked for answers but the answers I have found don't seem to be my problem but I might just need another set of eyes on my code.
the compiler errors:
In function main':
badriver.cpp:20: undefined reference toChecking::getAccount()'
badriver.cpp:23: undefined reference to Checking::setAccount(int)'
badriver.cpp:24: undefined reference toSavings::setAccount(int)'
badriver.cpp:26: undefined reference to `Checking::getAccount()'
badriver.cpp
#include "BankAccount.cpp"
#include "Checking.cpp"
#include "Savings.cpp"
#include <string>
#include <iostream>
using namespace std;
int main(){
Checking c;
Savings s;
cout << "Checking: " << c.getAccount() << " - Type: " << c.getType() << endl;
cout << "Savings: " << s.getAccount() << " - Type: " << s.getType() << endl;
c.setAccount(9);
s.setAccount(15);
cout << "New Checking: " << c.getAccount() << endl;
cout << "New Savings: " << s.getAccount() << endl;
return 0;
}
BankAccount.h
#ifndef BANKACCOUNT_H
#define BANKACCOUNT_H
#include <string>
using std::string;
using std::ostream;
using std::istream;
class BankAccount{
private:
int myAccount;
const char* color;
public:
// default constructor
BankAccount();
BankAccount(int account);
virtual ~BankAccount();
virtual void setAccount(int)=0;
int getAccount();
//
// void setSAccount(int);
// int getSAccount();
//
virtual const char* getColor();
virtual const char* getType() = 0;
//virtual const char* getCType() = 0;
protected:
void setColor(const char*);
};
#endif // BANKACCOUNT_H
BankAccount.cpp
#include "BankAccount.h"
#include "Checking.h"
#include "Savings.h"
#include <string>
#include <iostream>
#include <cstdlib>
using namespace std;
// default constructor
BankAccount::BankAccount(){
account = 1;
}
BankAccount::~BankAccount(){}
// void BankAccount::setAccount(int account){
// myAccount = account;
// }
int BankAccount::getAccount(){
return myAccount ;
}
BankAccount::BankAccount(int account){
myAccount = account;
}
const char* BankAccount::getColor(){
return color;
}
void BankAccount::setColor(const char* c){
color = c;
}
Checking.h
#ifndef CHECKING_H
#define CHECKING_H
#include "BankAccount.h"
#include <string>
using std::string;
using std::ostream;
using std::istream;
class Checking : public BankAccount{
private:
const char* type;
public:
Checking();
virtual ~Checking();
void setAccount(int account);
virtual const char* getType();
void setChecking(int);
int getChecking();
};
#endif //CHECKING_H
Checking.cpp
#include "Checking.h"
#include <string>
#include <string>
#include <iostream>
#include <cstdlib>
using namespace std;
Checking::Checking() : BankAccount(1), type("Checking"){}
Checking::~Checking(){}
BankAccount::~BankAccount(){}
void BankAccount::setAccount(int account){
myAccount = account;
}
const char* Checking::getType(){
return type;
}
Savings.h
#ifndef SAVINGS_H
#define SAVINGS_H
#include "BankAccount.h"
#include <string>
using std::string;
using std::ostream;
using std::istream;
class Savings: public BankAccount{
private:
const char* type;
public:
Savings();
virtual ~Savings();
void setAccount(int account);
virtual const char* getType();
void setSavings(int);
int getSavings();
};
#endif // SAVINGS_H
Savings.cpp
#include "Savings.h"
#include <string>
#include <string>
#include <iostream>
#include <cstdlib>
using namespace std;
Savings::Savings() : BankAccount(2), type("Savings"){}
Savings::~Savings(){}
BankAccount::~BankAccount(){}
void BankAccount::setAccount(int account){
myAccount = account;
}
const char* Savings::getType(){
return type;
}
Thanks for any help pointing me in the right direction.

Answer 1

Checking.cpp and Savings.cpp contain:
BankAccount::~BankAccount(){}
void BankAccount::setAccount(int account){
myAccount = account;
}
This causes undefined behaviour because you defined those functions in multiple files. You need to delete those lines from Checking.cpp and Savings.cpp, and instead put in definitions for the functions which are listed as being missing in the compiler output:
void Checking::setAccount(int account){
// code here
}
etc.