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Trying to use class files, getting "undefined reference to `WinMain@16'" error

This is a discussion on Trying to use class files, getting "undefined reference to `WinMain@16'" error within the C++ Programming forums, part of the General Programming Boards category; I am building an application that calculates travel time necessary to reach a user selected destination from predetermined city based ...

  1. #1
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    Oct 2012
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    Trying to use class files, getting "undefined reference to `WinMain@16'" error

    I am building an application that calculates travel time necessary to reach a user selected destination from predetermined city based upon an estimated travel speed determined by the user. For this program I am to utilize classes/class source files. When compiling my source file I continuously get the error “undefined reference to `WinMain@16’” and due to my being unfamiliar with the usage of source files I am not sure how to fix this issue. Any help would be appreciated with regard to pointing me in the right direction as to properly utilizing source files. Thanks in advance for the help.

    Header file:

    Code:
    #include <iostream>
    
    
    using namespace std;
    
    
    class Trip
    {
        private:
            string destination;
            double distance;
    
    
        public:
            void TripValue(string b, double c);
            void TripTime(Trip *a);
    };
    Source file:

    Code:
    #include "Trip.h"
    #include <iostream>
    
    
    using namespace std;
    
    
    void Trip::TripValue(string b, double c)
    {
        destination = b;
        distance = c;
    }
    
    
    void Trip::TripTime(Trip *a)
    {
        double user_speed;
        double time;
    
    
        cout << "Please enter your estimated travel speed in miles per hour: ";
        cin >> user_speed;
        cout << endl;
    
    
        time = (a->distance / user_speed);
    
    
        cout << endl;
        cout << "Your estimated travel time to " << a->destination << " is "
            << time << " hours.\n";
        cout << endl;
    }
    Application code:

    Code:
    #include <iostream>
    #include "Trip.h"
    
    
    using namespace std;
    
    
    int main()
    {
        Trip StL, Indy, Det, Nash, Dal, Den, NY, LA, Mia, Sea;
    
    
        int choice;
    
    
        StL.TripValue("St. Louis", 297.34);
        Indy.TripValue("Indianapolis", 184.78);
        Det.TripValue("Detroit", 282.73);
        Nash.TripValue("Nashville", 441.02);
        Dal.TripValue("Dallas", 925.91);
        Den.TripValue("Denver", 1004.93);
        NY.TripValue("New York", 791.50);
        LA.TripValue("Los Angeles", 2017.74);
        Mia.TripValue("Miami", 1363.55);
        Sea.TripValue("Seattle", 2032.31);
    
    
        do
        {
            cout << "=================================Trip Calulator=================================\n";
            cout << "Select your destination from Chicago:\n";
            cout << endl;
            cout << " 1. St. Louis\n";
            cout << " 2. Indianapolis\n";
            cout << " 3. Detroit\n";
            cout << " 4. Nashville\n";
            cout << " 5. Dallas\n";
            cout << " 6. Denver\n";
            cout << " 7. New York\n";
            cout << " 8. Los Angeles\n";
            cout << " 9. Miami\n";
            cout << "10. Seattle\n";
            cout << endl;
            cout << " 0. Exit\n";
            cout << "================================================================================\n";
    
    
            cin >> choice;
    
    
            cout << endl;
    
    
            switch (choice)
            {
                case 1:
                    StL.TripTime(&StL);
                    break;
                case 2:
                    Indy.TripTime(&Indy);
                    break;
                case 3:
                    Det.TripTime(&Det);
                    break;
                case 4:
                    Nash.TripTime(&Nash);
                    break;
                case 5:
                    Dal.TripTime(&Dal);
                    break;
                case 6:
                    Den.TripTime(&Den);
                    break;
                case 7:
                    NY.TripTime(&NY);
                    break;
                case 8:
                    LA.TripTime(&LA);
                    break;
                case 9:
                    Mia.TripTime(&Mia);
                    break;
                case 10:
                    Sea.TripTime(&Sea);
                    break;
            }
        } while (choice != 0);
    }

  2. #2
    C++ Witch laserlight's Avatar
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    If you are using an IDE that has a project concept, make sure that all the files are in the same project. Otherwise, make sure that you compile and link altogether; if you want to compile each source file separately, make sure you don't link (to build the executable program).
    C + C++ Compiler: MinGW port of GCC
    Version Control System: Bazaar

    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  3. #3
    Registered User
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    I'm using Code::Blocks and to this point have only utilized the feature to make a new "empty file" and have never explored the project option listed. Would re-creating this specifically as a project and then re-coding properly solve this issue I'm having?

  4. #4
    C++ Witch laserlight's Avatar
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    Yes, I think it would.
    C + C++ Compiler: MinGW port of GCC
    Version Control System: Bazaar

    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  5. #5
    and the hat of wrongness Salem's Avatar
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    > When compiling my source file I continuously get the error “undefined reference to `WinMain@16’”
    It would seem that you chose "win32 GUI program" as the project type.

    You need to make sure you choose a console project.
    stahta01 and Elysia like this.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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