bert.WPI.EDU> cat test.C

// file test.C, cs2223, D97/98 //
// program which demonstrates the use of the Timer class

// 20Feb98 NW, First version

// includes
#include "Timer.h"

// main
int main ()
	{
	Timer *timeit = new Timer();
	for (int i = 0; i < 10000000; i++); // waste some time
	delete timeit;
	return 0;
	} // end main()

// Copyright 1998 Norman Wittels
bert.WPI.EDU> g++ test2.C

collect2: ld returned 1 exit status
/usr/bin/ld:
Unresolved:
Timer::Timer(void)
Timer::~Timer(void)

/***** this was because we forgot to include ALL of the source code *****/

bert.WPI.EDU> g++ test2.C Timer.C

bert.WPI.EDU> a.out

Process 0 took 0.449982 seconds