10_16.obj : error LNK2001: unresolved external symbol "public: void __thiscall technician::setworkhours(int)" (?setworkhours@technician@@QAEXH@Z)
employee.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall salesman::pay(void)" (?pay@salesman@@UAEXXZ)
Debug/082402十.exe : fatal error LNK1120: 2 unresolved externals


代码如下：
//employee.h
class employee
{
protected:
    char name[20];
    int individualempno;
    int grade;
    float accumpay;
    static int employeeno;
public:
    employee();
    ~employee();
    virtual void pay()=0;
    virtual void promote(int increment = 0);
    void setname (char *);
    char * getname();
    int getindividualempno();
    int getgrade();
    float getaccumpay();
};

class technician:public employee
{
private:
    float hourlyrate;
    int workhours;
public:
    technician();
    void setworkhours(int wh);
    void pay();
    void promote(int);
};

class salesman:virtual public employee
{
protected:
    float commrate;
    float sales;
public:
    salesman();
    void setsales(float sl);
    void pay();
    void promote(int);
};

class manager:virtual public employee
{
protected:
    float monthlypay;
public:
    manager();
    void pay();
    void promote(int);
};

class salesmanager:public manager,public salesman
{
public:
    salesmanager();
    void pay();
    void promote(int);
};


//employee.cpp
#include <iostream>
#include <cstring>
#include "employee.h"

using namespace std;

int employee::employeeno=1000;

employee::employee()
{
    individualempno=employeeno++;
    grade=1;
    accumpay=0.0;}

employee::~employee()
{}

void employee::promote(int increment)
{   grade+=increment;}

void employee::setname(char* names)
{   strcpy(name,names);}

char* employee::getname()
{   return name;}

int employee::getindividualempno()
{   return individualempno;}

int employee::getgrade()
{   return grade;}

float employee::getaccumpay()
{   return accumpay;}

technician::technician()
{   hourlyrate=100;}

void technician::pay()
{  accumpay=hourlyrate*workhours;
}

void technician::promote(int)
{   employee::promote(2);}

salesman::salesman()
{   commrate = 0.04 ;}

void salesman::setsales(float sl)
{   sales=sl;}

void salesman::promote(int)
{   employee::promote(0);}

manager::manager()
{   monthlypay=8000;}

void manager::pay()
{   accumpay=monthlypay;}

void manager::promote(int)
{   employee::promote(3);}

salesmanager::salesmanager()
{   monthlypay=5000; commrate = 0.005;}

void salesmanager::pay()
{   accumpay=monthlypay+commrate*sales;
}

void salesmanager::promote(int)
{   employee::promote(2);}

//10_16.cpp
#include <iostream>
#include "employee.h"
#include <vector>
using namespace std;

int main()
{
    manager m1;
    technician t1;
    salesmanager sm1;
    salesman s1;
    char namestr[20];

    vector <employee *> vchar;
    vchar.push_back(&m1);
    vchar.push_back(&t1);
    vchar.push_back(&sm1);
    vchar.push_back(&s1);

    int i;
    for (i=0;i<4;i++)
    {
        cout<<"请输入下一个雇员的名字：";
        cin>>namestr;
        vchar[i]->setname(namestr);
        vchar[i]->promote();
    }

    cout<<"请输入兼职技术人员"<<t1.getname()<<"本月的工作时数";
    int ww;
    cin>>ww;
    t1.setworkhours(ww);

    cout<<"请输入销售经理"<<sm1.getname()<<"所管辖销售总额";
    float sl;
    cin>>sl;
    sm1.setsales(sl);

    cout<<"请输入销售员"<<sm1.getname()<<"销售额";
    cin>>sl;
    s1.setsales(sl);

    for (i=0;i<4;i++)
    {
        vchar[i]->pay();
        cout<<vchar[i]->getname()<<"编号"<<vchar[i]->getindividualempno()
            <<"级别为"
            <<vchar[i]->getgrade()<<"级，本月工资"<<vchar[i]->getaccumpay()<<endl;
    }
}