compilation error message

This is a discussion on compilation error message within the C++ Programming forums, part of the General Programming Boards category; Hi, any help will be much appreciated. I'm compiling with the command: g++ -Wall -o LQueue.C Simulation.C The message I ...

  1. #1
    ucs
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    compilation error message

    Hi, any help will be much appreciated.

    I'm compiling with the command:
    g++ -Wall -o LQueue.C Simulation.C

    The message I get is:
    Undefined first referenced symbol in file main

    Simulation.h
    Code:
    #include <iostream>
    #include <ctime>
    
    #ifndef SIMULATION
    #define SIMULATION
    
    #include "LQueue.h"
    
    class Simulation
    {
      public:
        /***** Function Members *****/
    	  /***** Constructor *****/
    	  Simulation();
    	  /*-----------------------------------------------------------
    	    Construct a Simulation object.
    
    		Precondition: None.
    		Postcondition: Input data members have been initialized 
    			with values entered by the user; output data members have 
    			been initialized to 0; and random number generator has 
    			been initialized.
    	   -----------------------------------------------------------*/
    
    	  /***** Running the simulation *****/
    	  void run();
    	  /*-----------------------------------------------------------
    	    Run the simulation.
    
    		Precondition: None.
    		Postcondition: Simulation of airport runway management 
    			has been completed and performance statistics is 
    			outputted.
    	   -----------------------------------------------------------*/
    
    	  /***** Output *****/
    	  void display(ostream & out);
    	  /*-----------------------------------------------------------
    	    Display results of the simulation.
    
    		Precondition: ostream out is open.
    		Postcondition: Simulation process is printed.
    
           -----------------------------------------------------------*/
    
    	  /***** Plane processing *****/
    	  void managePlanes();
    	  /*-----------------------------------------------------------
    	    Manage planes (if any) at the front of landing or takeoff 
    		queues.  
    
    		Precondition: freeRunway is true.
    		Postcondition: Planes are dequeued and put on runway.
    	   -----------------------------------------------------------*/
    
    	  void checkForNewPlane();
    	  /*---------------------------------------------------------------
    	    Check if a new plane has arrived and if so, add it to the 
    		takeoff queue or landing queue depending on different
    		circumstances. ((STAR - on h/o))
    
    		Precondition: none.
    		Postcondition: takeoff queue or landing queue has been updated.
    	   ----------------------------------------------------------------*/
      
      private:
    	  /***** Data Members *****/
    	    //-- Inputs
    	    double takeoffRate; //in terms of hrs
    		double landingRate; //in terms of hrs
    		int landTimeDuration; //in terms of mins
    		int takeoffTimeDuration; //in terms of mins
    		int lengthOfSimulation; //in mins
    
    		//-- Stats
    		int maxPlanesInLandingQ;
    		int avgTimeSpentWaitingToLand; //mins
    		int maxPlanesInTakeoffQ;
    		int avgTimeSpentWaitingToTakeoff; //mins
    
    
    		int landingTime;
    		int takeoffTime;
    		bool freeRunway; //some plane is in the process of landing (or not) (if plane takesoff, it's "done") (TRIANGLED)
    		int totalMinsWaitingToLand;
    		int totalMinsWaitingToTakeoff;
    
    		Queue takeoffQ;
    		Queue landingQ;
    };
    
    #endif

  2. #2
    ucs
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    Simulation.C
    Code:
    #include <iostream> // istream, ostream, >>, <<
    #include <cstdlib> // rand(), srand()
    #include <ctime> //time()
    using namespace std;
    
    #include "Simulation.h"
    
    Simulation::Simulation()
    {
    	//-- Initialize output stats
    	maxPlanesInLandingQ = 0;
    	avgTimeSpentWaitingToLand = 0; //mins
    	maxPlanesInTakeoffQ = 0;
    	avgTimeSpentWaitingToTakeoff = 0; //mins
    
    	freeRunway = false;
    	totalMinsWaitingToLand = 0;
    	totalMinsWaitingToTakeoff = 0;
    
    	//-- get input
    	cout << "Enter:/n" 
    		 << "Time for a plane to land (in minutes): ";
    		 cin >> landingTime; 
    		 
    }
    
    void Simulation::run()
    {
    }
    
    void Simulation::display(ostream & out)
    {
    }
    
    
    void Simulation::managePlanes()
    {
    }
    
    void Simulation::checkForNewPlane()
    {
    }

  3. #3
    ucs
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    For sure, there's nothing wrong with LQueue.C and LQueue.h because I've tested those separately.

  4. #4
    ucs
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    LOL It turns out I got the error because I didn't have a driver program.

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