C++ Linker Programming error with MinGW
<p>I am facing a linker error in my code and i am unable to detect it.
I think the error is in <code>addressBookType</code> class but i cannot detect it!</p>

<p>Is there any problem with <code>main</code>?</p>

<p>Or problem is in the class definition?</p>

<p>~Please help</p>

<pre><code>Compiler: MinGW GCC 4.6.2 32-bit
Executing  g++.exe...
g++.exe "D:\New Folder\Cpp\Assignment 4\q4\main.cpp" -o "D:\New Folder\Cpp\Assignment 4\q4\main.exe"    -I"E:\Program Files\Dev-Cpp\MinGW32\include"  -I"E:\Program Files\Dev-Cpp\MinGW32\include"   -L"E:\Program Files\Dev-Cpp\MinGW32\lib" -L"E:\Program Files\Dev-Cpp\MinGW32\lib" -static-libstdc++ -static-libgcc 
E:\DOCUME~1\@$L@()V)\LOCALS~1\Temp\ccHC7fsV.o:main.cpp:(.text+0x7a8): undefined reference to `addressBookType::addressBookType()'
E:\DOCUME~1\@$L@()V)\LOCALS~1\Temp\ccHC7fsV.o:main.cpp:(.text+0x7d6): undefined reference to `addressBookType::addressBookType()'
collect2: ld returned 1 exit status
</code></pre>

<p>The code is:</p>

<pre><code>#include&lt;iostream&gt;
#include&lt;cstdlib&gt;
#include&lt;fstream&gt;
#include&lt;string&gt;

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&lt;&lt;firstName&lt;&lt;" "&lt;&lt;lastName&lt;&lt;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 &lt;&lt; dMonth &lt;&lt; "-" &lt;&lt; dDay &lt;&lt; "-" &lt;&lt; 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 *&amp;ptr);

};

//////////class addressType End***
/////////////////////////////////

// IMPLEMENTATION OF "addressBookType" CLASS   //
///////////////// IMP START ////////////////////

void addressBookType::loadData(addressBookType *&amp;ptr){

    ifstream fin;
    ifstream fout;

    string tempName;
    cout&lt;&lt;"Enter file name:"&lt;&lt;endl;


            if(!fin){

                cout&lt;&lt;"Cannot open the image file : "&lt;&lt;endl;
                cout&lt;&lt;"Input Failure"&lt;&lt;endl;
                system("pause");


            }

            else{

                for(int i=0;!fin.eof();i++){

                    fin&gt;&gt;FirstName;
                    fin&gt;&gt;LastName;
                    fin&gt;&gt;DDay;
                    fin&gt;&gt;DMonth;
                    fin&gt;&gt;DYear;
                    getline(fin,StAddress);
                    getline(fin,City);
                    getline(fin,State);
                    fin&gt;&gt;Zipcode;
                    fin&gt;&gt;PhNo;
                    fin&gt;&gt;Relation;

                    cout&lt;&lt;FirstName&lt;&lt;LastName&lt;&lt;DDay&lt;&lt;DMonth&lt;&lt;DYear&lt;&lt;StAddress&lt;&lt;City&lt;&lt;State&lt;&lt;Zipcode&lt;&lt;PhNo&lt;&lt;Relation&lt;&lt;endl;

                }

            }   

}

int main (){

     addressBookType *ptr;
     addressBookType obj;
     ptr=new addressBookType[500];
     obj.loadData(ptr);

     system("pause");
     return(0);
}
</code></pre>
