unresolved external symbol "public: __thiscall [closed] - c++

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Closed 10 years ago.
I have looked and I know there are other answers out there but none of them seem to give me what i'm looking for so please don't report this as a "repost"
I'm getting the unresolved external symbol "public: __thiscall" error in my C++ code and i'm about to kick it out the window and just fail my C++ class. Please help me!!!!
My checking account header file
#include "BankAccount.h"
class CheckingAccount
{
private:
int numOfWithdrawls;
double serviceFee;
int AccountBal;
public:
bool withdraw (double wAmmt);
BankAccount CA;
CheckingAccount();
CheckingAccount(int accountNum);
};
and its CPP file
#include <iostream>
using namespace std;
#include "CheckingAccount.h"
CheckingAccount::CheckingAccount()
{
CA;
numOfWithdrawls = 0;
serviceFee = .50;
}
CheckingAccount::CheckingAccount(int accountNum)
{
CA.setAcctNum (accountNum);
numOfWithdrawls = 0;
serviceFee = .50;
}
bool CheckingAccount::withdraw (double wAmmt)
{
numOfWithdrawls++;
if (numOfWithdrawls < 3)
{
CA.withdraw(wAmmt);
}
else
{
if (CA.getAcctBal() + .50 <=0)
{
return 0;
}
else
{
CA.withdraw(wAmmt + .50);
return 1;
}
}
}
My BankAccount header file
#ifndef BankAccount_h
#define BankAccount_h
class BankAccount
{
private:
int acctNum;
double acctBal;
public:
BankAccount();
BankAccount(int AccountNumber);
bool setAcctNum(int aNum);
int getAcctNum();
double getAcctBal();
bool deposit(double dAmmt);
bool withdraw(double wAmmt);
};
#endif
My BankAccount CPP file
#include <iostream>
using namespace std;
#include "BankAccount.h"
BankAccount::BankAccount(int AccoutNumber)
{
acctNum = 00000;
acctBal = 100.00;
}
bool BankAccount::setAcctNum(int aNum)
{
acctNum = aNum;
return true;
}
int BankAccount::getAcctNum()
{
return acctNum;
}
double BankAccount::getAcctBal()
{
return acctBal;
}
bool BankAccount::deposit(double dAmmt)
{
acctBal += dAmmt;
return true;
}
bool BankAccount::withdraw(double wAmmt)
{
if (acctBal - wAmmt <0)
{
return 0;
}
else
{
acctBal -= wAmmt;
return 1;
}
}
My error:
1>BankAccountMain.obj : error LNK2019: unresolved external symbol "public: __thiscall BankAccount::BankAccount(void)" (??0BankAccount##QAE#XZ) referenced in function "public: __thiscall SavingsAccount::SavingsAccount(void)" (??0SavingsAccount##QAE#XZ)
1>CheckingAccount.obj : error LNK2001: unresolved external symbol "public: __thiscall BankAccount::BankAccount(void)" (??0BankAccount##QAE#XZ)

Answer 1

The "__thiscall" is noise. Read on. The error messages are complaining about BankAccount::BankAccount(void). The header file says that BankAccount has a default constructor, but there's no definition for it.

Answer 2

In your BankAccount class you declare a constructor that takes no arguments
BankAccount();
but you do not implement it. This is why the linker cannot find it. Provide an implementation for this constructor in your .cpp file and the link step should work.