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LOL It turns out I got the error because I didn't have a driver program. :p

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

Simulation.C


#include <iostream> // istream, ostream, >>, <<
#include <cstdlib> // rand(), srand()
#include <ctime> //time()
using namespace std;

#include "Simulation.h"

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