[RESOLVED] Unresolved external symbol

[crisdeveloper]

perhaps this can be a very popular error, but i´m beginner and i not used to see problems like this

#include <stdio.h>
#include <tchar.h>

#include <iostream>
#include <string>
#include <fstream>// enable writing to and reading from files
#include <cstdlib>
#include <time.h>

using namespace std;


class Person
{    

public:

   //Constructor and Destructor Methods

   Person(){cout<<"\n\tBuilding a Person.";};
   ~Person(){cout<<"\n\tDestroying a Person.";};

   //Accessor Methods

   string getName       (){ return Name; }
   string getLocation   (){ return Location; }
   string getAge        (){ return Age; }
   string getOccupation (){ return Occupation; }

   void setName       (string Name)       { Name = Name; }
   void setLocation   (string Location)   { Location = Location; }
   void setAge        (string Age)        { Age = Age; }
   void setOccupation (string Occupation) { Occupation = Occupation; }
private:

   string Name,
         Location,
         Age,
         Occupation;


};



//Function prototypes

void createperson();
void editperson();
void displayperson();
void saveperson();
void loadperson();



int main (int argc, char *argv[])
{
   
   Person* cg = new Person();

   char choose[10] = "";
   
    cout<<"\n\t Personnel database 1.0\n";

    //system display ("CLS");

    while (choose [0] != 'q')
    {
        system ("CLS");
        cout<<"\n\t---------------------Main Menu---------------------\n";
        cout<<"\n\t| |\n";
        cout<<"\n\t| (c) Create person |\n";
        cout<<"\n\t| (E) edit information |\n";
        cout<<"\n\t| (D) display person |\n";
        cout<<"\n\t| (S) Save person |\n";
        cout<<"\n\t| (L) Load person |\n";
        cout<<"\n\t| (Q) quit |\n";
        cout<<"\n\t| |\n";
        cout<<"\n\t---------------------------------------------------\n\n\t";
        cin>>choose;
        //system ("CLS");
        switch (choose [0])
        {
            //system ("CLS");
        case 'c': createperson(); break;
        case 'e': editperson(); break;
        case 'd': displayperson(); system ("pause"); break;
        case 's': saveperson(); break;
        case 'l': loadperson(); break;
        case 'q': cout<<"\n\tExiting main menu..."; break;
        default :"\n\tInvalid input!";
        }
      
    }

     system ("pause");
      return 0;

}

//Function´s scope


void createperson()
{

   Person* cg = new Person();
   
}

void editPerson()
{
    Person* cg = new Person();
   
   string TEMP;
    system ("CLS");
    cout<<"\n\n\t---------------------EDIT person ---------------------------";

    cout<<"\n\t Name: ";
    getline (cin,TEMP);
    cg->setName(TEMP);

    cout<<"\n\t Location ";
    getline (cin,TEMP);
    cg->setLocation(TEMP);

    cout<<"\n\t Age: ";
    getline (cin,TEMP);
    cg->setAge(TEMP);

    cout<<"\n\t Occupation: ";
    getline (cin,TEMP);
    cg->setOccupation(TEMP);
}

void displayPerson()
{
   Person* cg = new Person();

    system("CLS");
    cout<<"\n\n\t---------------------person information----------------------";
    cout<< "\n\tName: "      , cg->       getName();
    cout<< "\n\tOccupation:" , cg->   getLocation();
    cout<< "\n\tLocation: "  , cg->        getAge();
    cout<< "\n\tReferences:" , cg-> getOccupation();
    cout<<"\n\n\t---------------------------------------------------------------\n\n";
}

void savePerson()
{
   Person* cg = new Person();


    try
    {
        ofstream DATAFILE;
        DATAFILE.open("Data1.file",ios::out);

        DATAFILE <<cg->getName       ()<<"\n";
        DATAFILE <<cg->getLocation ()<<"\n";
        DATAFILE <<cg->getAge   ()<<"\n";
        DATAFILE <<cg->getOccupation ()<<"\n";

        DATAFILE.close(); //Prevents data from getting corrupt incase of sudden shutdown
        cout<<"\n\t Success! Data was saved to file.";
    }
    catch (exception x)
    {
        cout<<"\n\t File Error! Could not SAVE PERSON.";
    }
}

void loadperson()
{
   Person* cg = new Person();

    try
    {
        string TEMP;
        ifstream DATAFILE;
        DATAFILE.open("Data1.file",ios::in);
        getline (DATAFILE,TEMP);

        cg->setName (TEMP);
        getline (DATAFILE,TEMP);

        cg->setLocation (TEMP);
        getline (DATAFILE,TEMP);

        cg->setAge (TEMP);
        getline (DATAFILE,TEMP);

        cg->setOccupation (TEMP);
        DATAFILE.close();
    }
    catch (exception x)
    {
        cout<<"\n\t File Error! Unable to load data.";
    }
}

erros list:

Error   1   error LNK2019: unresolved external symbol "void __cdecl saveperson(void)" (?saveperson@@YAXXZ) referenced in function _main   H:\Cry_Dev\Programming\C++\Using_class_ in_ c++\Using_class_ in_ c++\Using_class_ in_ c++.obj
Error   2   error LNK2019: unresolved external symbol "void __cdecl displayperson(void)" (?displayperson@@YAXXZ) referenced in function _main   H:\Cry_Dev\Programming\C++\Using_class_ in_ c++\Using_class_ in_ c++\Using_class_ in_ c++.obj
Error   3   error LNK2019: unresolved external symbol "void __cdecl editperson(void)" (?editperson@@YAXXZ) referenced in function _main   H:\Cry_Dev\Programming\C++\Using_class_ in_ c++\Using_class_ in_ c++\Using_class_ in_ c++.obj
Error   4   error LNK1120: 3 unresolved externals   H:\Cry_Dev\Programming\C++\Using_class_ in_ c++\Debug\Using_class_ in_ c++.exe   1

what i can do to fit this problem?