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Problems with operator++() and operator--()

JBIRD304 (65)
I keep getting errors from hese functions. I am mind boggled. Any suggestions?? 

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  #include <iostream>
#include <string>
#include <iomanip>
using namespace std;

class Stock 
{
public:
	
	string sym; 
	int noShares; 
	double shareVal;
	double totVal;
	
	Stock(); //ctor
	Stock(string s, int n, double v);
	void setSym(string s);
	void buy(int n, double p);
	void sell(int n, double p);
	void update(double p);
	string getSym();
	double getVal();
	int getnoShares();
	void prnt();
	Stock operator++();
	Stock operator++(int);
	Stock operator--();
	Stock operator--(int);


private:
	void setTot();
	

};//endclass

void Stock::setSym(string s)
{ s = sym;}

string Stock::getSym()
{return sym;}

double Stock::getVal()
{return shareVal;}

int Stock::getnoShares()
{return noShares;}

Stock::Stock(string s, int n, double v)
{
	sym = s;
    noShares = n;
	shareVal = v;
	setTot();
}

void Stock::buy(int n, double p)
{
	
	noShares = n;
	shareVal = p;

}

void Stock::sell(int n, double p)
{
	
    noShares = n;
	shareVal = p;

}

void Stock::update(double p)
{
  shareVal = p;
}

void Stock::prnt()
{

	cout << "SYMBOL: " << getSym();

	cout << "Number of Shares: " << getnoShares();

	cout << "Current Price of Share: " << getVal();

	cout << "Total Value of Holding: " << totVal;
}

void Stock::setTot()
{
	totVal = noShares * shareVal;

}

Stock Stock::operator++()
{
	
	++noShares;
	setTot();
	
}


Stock Stock::operator--()
{
	Stock(sym,noShares, shareVal);
	--noShares;
	setTot();
	return Stock(sym,noShares, shareVal);
}

int main()
{
    Stock sally;
    Stock bob("TKX", 101, 4.56231);
    Stock will("ITK", 71, 7.06319);
    cout << fixed << showpoint << setprecision(2);
    cout << "\nBob's " << bob.getSym() << " stock is worth $" << bob.getVal() * bob.getnoShares();
    cout << "\nWill's " << will.getSym() << " stock is worth $" << will.getVal() * will.getnoShares();
    sally.setSym("GBM");
    sally.buy(33, 103.65907);
    cout << "\nSally's " << sally.getSym() << " stock is worth $" << sally.getVal() * sally.getnoShares();
    cout << "\nSally's stock information:";
    sally.prnt();
    bob.sell(31, 5.42384);
    will.buy(117, 7.33288);
    cout << "\nAfter selling 31 shares at $5.42384 per share,";
    cout << "\nBob's " << bob.getnoShares() << " shares of " << bob.getSym() << " stock are worth $" << bob.getVal()  * bob.getnoShares();
    cout << "\nAfter buying 117 shares at $7.33288 per share, Will's stock information:";
    will.prnt();
    bob.sell(222, 1.1);     // data validation test
    will.buy(-99, 6.64281); // data validation test
	cout << "\nTesting overloaded increment and decrement operators:";
    (++bob).prnt();
    bob++.prnt();
	bob.prnt();
    (--bob).prnt();
    bob--.prnt();
	bob.prnt();
    return 0;
}//endmain
Cubbi (4774)
You should say what those errors were

I am seeing 4 errors:

"control reaches end of non-void function" at line 102 (that function is declared to return a Stock by value, but is missing a return statement)

undefined reference to `Stock::Stock()' (that function is declared at line 15, called at line 115, but never defined)

undefined reference to `Stock::operator++(int)' (that function is declared at line 26, called at line 136, but never defined)

undefined reference to `Stock::operator--(int)' (that function is declared at line 28, called at line 139, but never defined)
JBIRD304 (65)
1>------ Build started: Project: Lab5, Configuration: Debug Win32 ------
1>Stock.obj : error LNK2019: unresolved external symbol "public: class Stock __thiscall Stock::operator--(int)" (??FStock@@QAE?AV0@H@Z) referenced in function _main
1>Stock.obj : error LNK2019: unresolved external symbol "public: class Stock __thiscall Stock::operator++(int)" (??EStock@@QAE?AV0@H@Z) referenced in function _main
1>Stock.obj : error LNK2019: unresolved external symbol "public: __thiscall Stock::Stock(void)" (??0Stock@@QAE@XZ) referenced in function _main
1>c:\users\j-bird\documents\visual studio 2010\Projects\Lab5\Debug\Lab5.exe : fatal error LNK1120: 3 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Those are the exact errors that I am getting from my compiler. I am not sure how to fix them. I am not sure where I need to call my copy constructor either.
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