嗨，我正在尝试学习 stanford cs106/x 课程，但他们使用了某些不再提供的库。我设法找到了它们的一个版本，但我经常遇到错误。我将 .h 文件添加到我正在使用它们的当前项目中。这是我在 C++ 中运行的简单代码：
#include <iostream>
#include "genlib.h"
#include "simpio.h"
int main()
{
cout << "How much do you love me? ";
int howAweSome = GetInteger();
for (int i = 0; i < howAweSome; i++)
cout << "10GB rocks!" << endl;
return 0;
}
出现以下错误：
Undefined symbols for architecture x86_64:
"GetInteger()", referenced from:
Main() in main.o
"_main", referenced from:
-u command line option
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
以下是使用的库：
“simplio.h”：
/*
* File: simpio.h
* Last modified on Wed Jul 22 07:01:03 2009 by eroberts
* modified on Wed Sep 18 13:34:29 2002 by zelenski
* -----------------------------------------------------
* This interface provides access to a simple package of
* functions that simplify the reading of console input.
*/
#ifndef _simpio_h
#define _simpio_h
#include "genlib.h"
/*
* Function: GetInteger
* Usage: n = GetInteger();
* ------------------------
* GetInteger reads a line of text from standard input and scans
* it as an integer. The integer value is returned. If an
* integer cannot be scanned or if more characters follow the
* number, the user is given a chance to retry.
*/
int GetInteger();
/*
* Function: GetLong
* Usage: n = GetLong();
* ---------------------
* GetLong reads a line of text from standard input and scans
* it into a long integer. The long is returned. If the
* number cannot be scanned or if extra characters follow it,
* the user is given a chance to retry.
*/
long GetLong();
/*
* Function: GetReal
* Usage: x = GetReal();
* ---------------------
* GetReal reads a line of text from standard input and scans
* it as a double. If the number cannot be scanned or if extra
* characters follow after the number ends, the user is given
* a chance to reenter the value.
*/
double GetReal();
/*
* Function: GetLine
* Usage: s = GetLine();
* ---------------------
* GetLine reads a line of text from standard input and returns
* the line as a string. The newline character that terminates
* the input is not stored as part of the string that is returned.
*/
string GetLine();
#endif
“genlib.h”：
/*
* File: genlib.h
* Last modified on Sun Jul 17 2011 by Colin Leach
* modified on Mon Jun 8 20:16:05 2009 by eroberts
* modified on Wed Sep 18 13:41:31 2002 by zelenski
* -----------------------------------------------------
* This header file is indicated to be included in
* all the programs written for CS106B/X and provides a few
* common definitions. Note this header has a "using namespace std"
* clause. If a file includes this header, it can then use
* features from the std namespace without qualifying by scope.
*
* IMPORTANT!! I had to change the interface after failing to
* implement the Stanford version. Hence the genlib.h bundled
* with CS106B exercises is NOT compatible - don't use it with
* Colin's open-source library code.
* Apologies for the inconvenience, but I'm a C++ novice doing
* the best I can.
*/
#ifndef _genlib_h
#define _genlib_h
/* This strange-looking pragma is here to disable a warning from Visual C++
* about truncating long identifiers for debugging symbols. The warning is
* harmless, but a little disconcerting, so we suppress it. It comes up
* using STL and other long template expansions.
*/
#if defined(_MSC_VER)
#pragma warning(disable: 4786)
#endif
#include <string>
#include <exception>
using namespace std;
/*
* Class: ErrorException
* ---------------------
* This exception is raised by calls to the Error function, which
* makes it possible for clients to respond to error conditions
* without having their programs bomb completely.
*/
class ErrorException : public exception {
public:
ErrorException(string msg);
virtual ~ErrorException() throw ();
virtual const char* what() const throw ();
//virtual string getMessage();
private:
string msg;
};
/*
* Function: Error
* Usage: Error(msg);
* ------------------
* Error is used to signal an error condition in a program. It first
* throws an ErrorException. If that isn't caught, it outputs the
* error message string to the cerr stream and then exits the program
* with a status code indicating failure.
*/
void Error(string str);
/*
* Function macro: main
* --------------------
* The purpose of this macro definition is to rename the student
* main to Main in order to allow a custom main defined in our
* libraries to configure the application before passing control
* back to the student program.
*
* Note that this non-Stanford version only affects the zero-argument
* form of main(), not main(int argc, char* argv[]).
* If you want to use command-line arguments, you also have to catch
* your own ErrorException - see init.h/init.cpp for details.
*/
#define main() Main()
#endif
我在 macbook pro OS X 10.8.2 上运行 Xcode 4.5.2。如果有人知道如何解决这个问题，那将有很大帮助。