C++ MinGW 的链接器编程错误

我在代码中遇到链接器错误，无法检测到它。我认为错误出在addressBookType课上，但我无法检测到它！

main有什么问题吗？

还是问题出在类定义中？

~请帮忙

Compiler: MinGW GCC 4.6.2 32-bit
Executing  g++.exe...
g++.exe "D:New FolderCppAssignment 4q4main.cpp" -o "D:New FolderCppAssignment 4q4main.exe"    -I"E:Program FilesDev-CppMinGW32include"  -I"E:Program FilesDev-CppMinGW32include"   -L"E:Program FilesDev-CppMinGW32lib" -L"E:Program FilesDev-CppMinGW32lib" -static-libstdc++ -static-libgcc 
E:DOCUME~1@$L@()V)LOCALS~1TempccHC7fsV.o:main.cpp:(.text+0x7a8): undefined reference to `addressBookType::addressBookType()'
E:DOCUME~1@$L@()V)LOCALS~1TempccHC7fsV.o:main.cpp:(.text+0x7d6): undefined reference to `addressBookType::addressBookType()'
collect2: ld returned 1 exit status

代码为：

#include<iostream>
#include<cstdlib>
#include<fstream>
#include<string>
using namespace std;
//////////////////////////////"personType" is from D.S Malik Course Website
////////////***Class person Start

class personType
{
public:
     void print() const;
       //Function to output the first name and last name
       //in the form firstName lastName.

    void setName(string first, string last);
      //Function to set firstName and lastName according 
      //to the parameters.
      //Postcondition: firstName = first; lastName = last
    string getFirstName() const;
      //Function to return the first name.
      //Postcondition: The value of firstName is returned.
    string getLastName() const;
      //Function to return the last name.
      //Postcondition: The value of lastName is returned.
    personType(string first, string last);
      //Constructor
      //Sets firstName and lastName according to the parameters.
      //The default values of the parameters are null strings.
      //Postcondition: firstName = first; lastName = last  
 private:
    string firstName; //variable to store the first name
    string lastName;  //variable to store the last name
};
/////////Class person End***///////////
// IMPLEMENTATION OF "PersonType" CLASS  //
///////////////// IMP START ////////////////////
personType::personType(string first="",string last=""){
}
void personType::setName(string first,string last){
    firstName=first;
    lastName=last;
}
string personType::getFirstName() const{
return firstName;
}
string personType::getLastName () const{
return lastName;
}
void personType::print() const{
    cout<<firstName<<" "<<lastName<<endl;
}
////////////////// IMP END ////////////////////

/////////////////////////////////////////////////////////////////////////////////////////////

////////***class addressType Start
class addressType{

    private:
    string stAddress;
    string city;
    string state;
    string zipcode;
    public:
        addressType();
        addressType(string,string,string,string);
        void setAddress(string);
        string getAddress();
        void setCity(string);
        string getCity();
        void setState(string);
        string getState();
        void setZipcode(string);
        string getZipcode();
};
// IMPLEMENTATION OF "addressType" CLASS  //
///////////////// IMP START ////////////////////
addressType::addressType(string=" ",string=" ",string=" ",string=" "){
}
void addressType::setAddress(string addr){
    stAddress=addr;
}
string addressType::getAddress(){
    return stAddress;
}
void addressType::setCity(string cit){
    city=cit;
}
string addressType::getCity(){
    return city;
}
void addressType::setState(string sta){
    state=sta;
}
string addressType::getState(){
    return state;
}
void addressType::setZipcode(string zip){
    zipcode=zip;
}
string addressType::getZipcode(){
    return zipcode;
}
///////////////// IMP END ////////////////////
//////////class addressType End***
/////////////////////////////////

//////////////////////////////////
//////***class extPersonType Start
class extPersonType {
    private:
        string relation;
        string phNo;
    public:
        extPersonType();
        extPersonType(string,string);
        void setRelation(string);
        string getRelation();
        void setphNo(string);
        string getphNo();

};

// IMPLEMENTATION OF "extPersonType" CLASS   //
///////////////// IMP START ////////////////////
extPersonType::extPersonType(string =" " ,string = " "){
}
void extPersonType::setRelation(string rel){
    relation=rel;
}
string extPersonType::getRelation(){
    return relation;
}
void extPersonType::setphNo(string ph){
    phNo=ph;
}
string extPersonType::getphNo(){
    return phNo;
}
///////////////// IMP END ////////////////////
//////////class extPersonType End***
///////////////////////////////////////////////////////////////////////////////////////////

//////////////////////////////"dateType" is from D.S Malik Course Website
////////***class DateType Start
class dateType
{
public:
    void setDate(int month, int day, int year);
      //Function to set the date.
      //The member variables dMonth, dDay, and dYear are set 
      //according to the parameters.
      //Postcondition: dMonth = month; dDay = day;
      //               dYear = year
    int getDay() const;
      //Function to return the day.
      //Postcondition: The value of dDay is returned.
    int getMonth() const;
      //Function to return the month.  
      //Postcondition: The value of dMonth is returned.
    int getYear() const;
      //Function to return the year.     
      //Postcondition: The value of dYear is returned.
    void printDate() const;
      //Function to output the date in the form mm-dd-yyyy.
    dateType(int month = 1, int day = 1, int year = 1900);
      //Constructor to set the date
      //The member variables dMonth, dDay, and dYear are set 
      //according to the parameters.
      //Postcondition: dMonth = month; dDay = day; dYear = year;
      //               If no values are specified, the default 
      //               values are used to initialize the member
      //               variables.
private:
    int dMonth; //variable to store the month
    int dDay;   //variable to store the day
    int dYear;  //variable to store the year
};
//////////class dateType End***
/////////////////////////////////

// IMPLEMENTATION OF "DateType" CLASS   //
///////////////// IMP START ////////////////////
void dateType::setDate(int month, int day, int year)
{
    dMonth = month;
    dDay = day;
    dYear = year;
}
int dateType::getDay() const 
{
    return dDay;
}
int dateType::getMonth() const 
{
    return dMonth;
}
int dateType::getYear() const 
{
    return dYear;
}
void dateType::printDate() const
{
    cout << dMonth << "-" << dDay << "-" << dYear;
}
    //Constructor with parameters
dateType::dateType(int month, int day, int year) 
{ 
    dMonth = month;
    dDay = day;
    dYear = year;
}
//////////////// IMP END /////////////////////
////////////////////////////////////////////////////////////////////////////////

//////***class addressBookType Start
class addressBookType {
private:
    string FirstName; //variable to store the first name
    string LastName;  //variable to store the last name
    string StAddress;
    string City;
    string State;
    string Zipcode; 
    string Relation;
    string PhNo;
    int DMonth; //variable to store the month
    int DDay;   //variable to store the day
    int DYear;  //variable to store the year
protected:
    addressType obj1;
    dateType obj2;
    extPersonType obj3;
public:
    addressBookType();
    static int count;
    void loadData(addressBookType *&ptr);
};
//////////class addressType End***
/////////////////////////////////
// IMPLEMENTATION OF "addressBookType" CLASS   //
///////////////// IMP START ////////////////////
void addressBookType::loadData(addressBookType *&ptr){
    ifstream fin;
    ifstream fout;
    string tempName;
    cout<<"Enter file name:"<<endl;

            if(!fin){
                cout<<"Cannot open the image file : "<<endl;
                cout<<"Input Failure"<<endl;
                system("pause");

            }
            else{
                for(int i=0;!fin.eof();i++){
                    fin>>FirstName;
                    fin>>LastName;
                    fin>>DDay;
                    fin>>DMonth;
                    fin>>DYear;
                    getline(fin,StAddress);
                    getline(fin,City);
                    getline(fin,State);
                    fin>>Zipcode;
                    fin>>PhNo;
                    fin>>Relation;
                    cout<<FirstName<<LastName<<DDay<<DMonth<<DYear<<StAddress<<City<<State<<Zipcode<<PhNo<<Relation<<endl;
                }
            }   
}
int main (){
     addressBookType *ptr;
     addressBookType obj;
     ptr=new addressBookType[500];
     obj.loadData(ptr);
     system("pause");
     return(0);
}