Stupid Linker error LNK2019

[eraserwars]

I have been googeling every possible solution, but I cannot seem to fix LNK2019. My code is below, but I just cannot understand how anything related to LNK2019 from Microsoft's help center applies to it. GRRRRRR. The error says

1>Lab Four.obj : error LNK2019: unresolved external symbol "void __cdecl highLowReport(c lass weatherStation * const,int)" (?highLowReport @@YAXQAVweather Station@@H@Z) referenced in function _main

1>Lab Four.obj : error LNK2019: unresolved external symbol "void __cdecl dailyReport(cla ss weatherStation * const,int)" (?dailyReport@@ YAXQAVweatherSt ation@@H@Z) referenced in function _main

1>Lab Four.obj : error LNK2019: unresolved external symbol "void __cdecl postTemperature s(class weatherStation * const,int)" (?postTemperatu res@@YAXQAVweat herStation@@H@Z ) referenced in function _main


This is my code...

#include <iostream>
#include <string>
using namespace std;
 
class weatherStation  
{
         string stationDesignation;  //Identifies the station
         string stationAgent; //Who's responsible
         double fTemperature; //how hot it is
         double cTemperature;
 
public:
         void setDesignation(string ID)                {stationDesignation = ID;} 
         void setAgent(string agent)                {stationAgent = agent;}
         void setFTemperature(double fDegree)        {fTemperature = fDegree;}
         void setCTemperature(double cDegree)        {cTemperature = cDegree;}
 
         string getDesignation()                {return stationDesignation;}
         string getAgent()                        {return stationAgent;}
         double getTemperature()                {return fTemperature;}
         double getcTemperature()                {return cTemperature;}
 
         void Displayer();
         void postTemperatures(weatherStation list[], int numItems);
         void dailyReport(weatherStation list[], int numItems);
         void highLowReport(weatherStation list[], int numItems);
};
void weatherStation::Displayer() 
{
                 cout << "--------------------------------------" << endl;
                 cout << "Station:\t " << stationDesignation << endl;
                 cout << "Agent:\t  "  << stationAgent << endl;
                 cout << "Current Temperature: " << fTemperature << "\t" << cTemperature << endl;
                 cout << "--------------------------------------" << endl;
}
 
void menu();
int addStations(weatherStation[]);
void postTemperatures(weatherStation[], int);
void dailyReport(weatherStation [], int);
void highLowReport(weatherStation[], int);
 
 
 
 
int main()
{
    weatherStation list[100];
    string command;
    int numItems;
    cout << "Type Menu to view menu";
    for(;;)
    {
        cout << "Enter command: " << endl;
            getline(cin, command);
        if(command == "Menu")
            menu();
        else if(command == "Add Stations")
            numItems = addStations(list);
        else if(command == "Post Temperatures")
            postTemperatures(list, numItems);
        else if(command == "Daily Report")
            dailyReport(list, numItems);
        else if(command == "High-Low Report")
            highLowReport(list, numItems);
        else if(command == "Quit")
            break;
    }
}
 
void menu()
{
    cout << "Menu" << endl;
    cout << "-----------------" << endl;
    cout << "Add Stations" << endl;
    cout << "Post Temperatures" << endl;
    cout << "Daily Report" << endl;
    cout << "High-Low Report" << endl;
    cout << "Quit" << endl;
    cout << "-----------------" << endl;
}
 
int addStations(weatherStation list[])
{
    int K = 0;
    string ID, agent;
    cout << "Enter Station Information Below, Stop To Quit" << endl;
    cout << "-----------------------------------" << endl;
    for(;;)
    {
        cout << "Enter Station Designation: ";
        getline(cin, ID);
        if(ID == "Stop")
            break;
        cout << "Enter Contact Agent: ";
        getline(cin, agent);
        list[K].setDesignation(ID);
        list[K].setAgent(agent);
        K++;
        cout << "-----------------------------------" << endl;
        cout << "-----------------------------------" << endl;
    }
    return K;
}
 
void weatherStation::postTemperatures(weatherStation list[], int numItems)
{
    int A = 0;
    double temperature;
 
    cout << "Enter reported fahrenheit temperatures" << endl;
    cout << endl;
 
    for(A = 0; A < numItems; A++) 
    {
        cout << "Weather Station " << stationDesignation << endl;
        cout << "Agent " << stationAgent << endl;
        cout << "Temperature = ";
        cin >> temperature;
        list[A].setFTemperature(temperature);
        list[A].setCTemperature((5*(temperature-32)/9));
    }
 
    cout << endl;
    cout << "--------------------------------------------------" << endl;
}
 
void weatherStation::dailyReport(weatherStation list[], int numItems)
{
    int A = 0;
    double fTotal = 0;
    double cTotal = 0;
 
    cout << "NGS Daily Temperature Report" << endl;
    cout << "================================================" << endl;
    cout << "\tFahrenheit\tCelsius" << endl;
    cout << "------------------------------------------------" << endl;
    for(A = 0; A < numItems; A++)
    {
        cout << stationDesignation << ": " << fTemperature << "\t" << cTemperature << endl;
        cout << "------------------------------------------------" << endl;
        fTotal += fTemperature;
        cTotal += cTemperature;
    }
    cout << "Mean Temperature: " << fTotal << "\t" << cTotal;
    cout << "================================================" << endl;
}
 
void weatherStation::highLowReport(weatherStation list[], int numItems)
{
    int K = 0;
    double highestF = 0;
    double lowestF = 0;
    double highestC = 0;
    double lowestC = 0;
 
    //Identifying highest and lowest temperatures
    for (K = 0; K < numItems; K++)
    {
        if(fTemperature > highestF)
            highestF = fTemperature;
    }
 
    for (K = 0; K < numItems; K++)
    {
        if(fTemperature < lowestF)
            lowestF = fTemperature;
    }
 
    for (K = 0; K < numItems; K++)
    {
        if(cTemperature > highestC)
            highestC = cTemperature;
    }
 
    for (K = 0; K < numItems; K++)
    {
        if(cTemperature < lowestC)
            highestC = cTemperature;
    }
 
    cout << "NGS High-Low Temperature Report" << endl;
    cout << "===============================================" << endl;
    cout << "\t\t     Fahrenheit" << "\t\tCelsius" << endl;
    cout << "-----------------------------------------------" << endl;
    cout << "Lowest Temperature:  " << lowestF << "\t\t" << lowestC << endl;
    cout << "-----------------------------------------------" << endl;
    cout << "Highest Temperature: " << highestF << "\t\t" << highestC << endl;
    cout << "-----------------------------------------------" << endl;
    cout << "End Temperature Data Report" << endl;
}
 

[unauthorized]

int addStations(wea therStation[]);
void postTemperature s(weatherStatio n[], int);
void dailyReport(wea therStation [], int);
void highLowReport(w eatherStation[], int);

These functions are global declared but not defined. On the other hand your class methods that are defined never get called.

To illustrate my point, look at the following pseudo code:
void my_method(); // let's call this func Fred
class MyClass {
public: void my_method(); // let's call this func Barney
}
MyClass object;
object.my_metho d(); // correct, calls Barney
my_method(); // incorrect - calls Fred

void object::my_meth od() { ... } // defines Barney
void my_method() { ... } // defines Fred

What you are doing instead is just calling the global function, which would normally result in compiler error, but since you have declared yet not defined global function with the same name and params, you get linker errors instead.

If what I'm saying is not clear, you should go read up on some C++ textbook about class methods (also called member functions). Come back if you still have questions after that.