2 个链接错误，1 个来自虚函数，1 个来自派生类

编译时都会收到LNK 2019和2001错误。 LNK2019指出：

public: __thiscall ColMbr::ColMbr(unsigned int,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (??0ColMbr@@QAE@IV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) referenced in function "public: __thiscall Alumni::Alumni(unsigned int,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,int,int,int,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (??0Alumni@@QAE@IV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@HHH0@Z

因此，将ColMbr类与校友联系起来存在某种错误。 LNK2011 说：

"public: virtual void __thiscall Alumni::addClass(unsigned int,unsigned int)" (?addClass@Alumni@@UAEXII@Z)

所以我的虚函数调用有问题。 我知道LNK错误意味着需要声明一个我错过的变量，但我看不到它。 首先，Alumni：：addClass 函数只是为了确保 Alumni 不会像 ColMbr 那样成为抽象类，它就是从 ColMbr 派生出来的。 其次，校友中的所有论点都是在校友或ColMbr中定义和声明的。

如果这是我想说的任何事情LNK2019可能是我的常量无符号int idNbr的问题。 我不知道LNK2001有什么问题。 也许我需要给函数一个垃圾目的或其他东西。

这是我的头文件，后跟 cpp。

#include <iostream>
#include <string>
#include <sstream>
using namespace std;
#ifndef _ColMbr
#define _ColMbr
class ColMbr
{
protected:
    const unsigned int idNbr;
    std::string name;
public:
    ColMbr();
    ColMbr(const unsigned int idNbr, std::string stdnt_name);
    std::string setName(std::string stdnt_name);
    virtual void display(void);
    virtual void addClass(unsigned int credits, unsigned int gradePoint) = 0;
};
#endif // !1
std::string ColMbr::setName(std::string stdnt_name)
        {
            name = stdnt_name;
            return name;
        }
class Student : public ColMbr
{
private:
    unsigned int credHrs, qualPts;
    std::string degSought;
    double GPA;
public:
    Student(unsigned int idNbr, std::string name) : ColMbr (idNbr, name)
    {
        credHrs = 0;
        qualPts = 0;
        degSought = "Unspecified";
    }
    Student(const unsigned int idNbr, std::string stdnt_name, unsigned int credHrs1, unsigned int qualPts1, std::string newDegree) : ColMbr(idNbr,stdnt_name)
    {
        credHrs = credHrs1;
        qualPts = qualPts1;
        degSought = newDegree;
    }
    void setDegree(std:: string newDegree);
    double getGPA(unsigned int credHrs, unsigned int qualPts);
    void addClass(unsigned int newClass, unsigned int newQualPts)
    {
        credHrs = credHrs + newClass;
        qualPts = qualPts + newQualPts;
    }
    void display(void)
    {
        std::cout << "This student is active." << std::endl <<"ID #: "
            << idNbr << std::endl << "Name: " << name << std::endl
            << "GPA: " << GPA << std::endl << "Major: " << degSought
            << std::endl;
    }
};
void Student::setDegree(std:: string newDegree)
{
    degSought = newDegree;
}
double Student::getGPA(unsigned int credHrs, unsigned int qualPts)
{
    double credHrs1, qualPts1;
    std::istringstream input(credHrs);
    input >> credHrs1;
    std::istringstream input1(qualPts);
    input >> qualPts1;
    GPA = qualPts1 / credHrs1;
    return GPA;
}
#ifndef _Alumni
#define _Alumni
class Alumni : public ColMbr
{
private:
    std::string degree;
    int month, day, year;
public:
    Alumni(const unsigned int idNbr, std::string stdnt_name, int gradMonth, int gradDay, int gradYear, std::string newDegree) : ColMbr(idNbr, stdnt_name)
    {
        degree = newDegree;
        month = gradMonth;
        day = gradDay;
        year = gradYear;
    }
    void addClass(unsigned int credits, unsigned int gradePoint);
    void display (void)
    {
        std::cout << "This student is an Alumni." << std::endl <<"ID #: "
                << idNbr << std::endl << "Name: " << name << std::endl
                << "Graduation Date: " << month << "/" << day << "/" << year 
                << std::endl << "Major: " << degree << std::endl;
    }
};
#endif

/***

#include <iostream> 
#include <cstdlib> 
#include "ColMbrs.h" 

int main() 
{ 
    ColMbr *cMbr[4]; // array of base-class pointers 
    int i; // index to array 
 // Create some college members 
    cMbr[0] = new Student( 12345, "Steven DiFranco", 15, 33, "AA" ); 
    cMbr[1] = new Alumni( 98765, "Don Green", 12, 15, 1978, "AAS" ); 
    cMbr[2] = new Alumni( 24680, "Henry Thoreau", 5, 22, 1846, "AA" ); 
    cMbr[3] = new Student( 13579, "Millenia Best" ); 
 // display the array 
    cout << "All college members:n"; 
    for( i = 0; i < 4; ++i ) 
    { 
        cMbr[i]->display(); // no need to check type field or cast 
        cout << endl; 
    } 
 // test addClass for student 
    cMbr[3]->addClass( 3, 12 ); 
    cMbr[3]->display(); 
    cout << endl; 
    system("PAUSE"); 
    return 0; 
}