Thread: unresolved external symbol

Hmm i hate these linking errors, the error messages are next to useless. Or at least seem it. Here's whats up, all im doing is making up some classes to show use of inheritance. It compiles ok, then I get this error at link time:
CCharacter.obj : error LNK2001: unresolved external symbol "public: __thiscall CPlayer::CPlayer(void)" (??0CPlayer@@QAE@XZ)
Debug/CCharacter.exe : fatal error LNK1120: 1 unresolved externals

the relevant code is:

Code:

class CPlayer : public CCharacter
{
public:

CPlayer();

void Move() {cout << m_sName << " moves" << endl;}

};

int main()
{
CPlayer play1;

play1.Attack();
play1.Use();
play1.Move();

return 0;
}

Those errors esually involve when the compiler found a
declareation of a function but not its definition, in other words
it cant find the function itself.
In this case, i can find the constructor, add this:

Code:

CPlayer::CPlayer()
{
}

under the class

Originally posted by Polymorphic OOP
because you declared a default constructor and created an object, but never defined the constructor.

No fair!! i post a nice explanation and you get to be first

thankyou, i added that, but now i get the error:
CCharacter.cpp(55) : error C2512: 'CCharacter' : no appropriate default constructor available

I keep getting this error, why is it? It appears to go if I take everytihng out of the constructor.

Post your code for CCharacter as well as line 55 where you are creating the object.

my guess would be that it wants you to provide a CCharacter default constructor (no parameters).

Code:

class CCharacter : public CWorld
{
public:
string m_sName, m_sGender;
int m_iHealth, m_iEnergy;

CCharacter(string name, string gender) : m_sName(name), m_sGender(gender), m_iHealth(100), m_iEnergy(100) {}
~CCharacter() {}

void Attack() {cout << m_sName << " attacks" << endl;}
void Use() {cout << m_sName << " uses a weapon" << endl;}
};

class CPlayer : public CCharacter
{
public:

CPlayer();

void Move() {cout << m_sName << " moves" << endl;}

};

CPlayer::CPlayer()
{                                                      // This is line 54
}

so i could do a default constructor with nothing, then add a copy constructor thingy like CCharacter::CCharacter( /* with all my stuff in*/)?

still aint working... you see i remember the days when i used to enjoy programming... when i used to program in C :P

thankyou, it works. And don't worry guys, tomorrow's the hand in day for the coursework, then i get 3 weeks off in which i plan to essentially re-learn c++.