编辑：
我想出了解决方案。我没有将 -combine 添加到我的编译指令中，这会产生错误。
我正在阅读 Deitel 和 Deitel 的《C++ How to Program》一书，并且在使用 g++ 构建和编译 C++ 接口时遇到了问题。问题是，我已经在 .h 文件中声明了类并在 .cpp 文件中定义了实现，但是当我尝试编译我编写的测试文件时，我无法弄清楚如何让它编译和工作。我收到的 g++ 错误是：
Undefined symbols:
"GradeBook::GradeBook(std::basic_string<char, std::char_traits<char>, std::allocator<char> >)", referenced from:
_main in ccohy7fS.o
_main in ccohy7fS.o
"GradeBook::getCourseName()", referenced from:
_main in ccohy7fS.o
_main in ccohy7fS.o
ld: symbol(s) not found
collect2: ld returned 1 exit status<
如果有人能指出我正确的方向，我将不胜感激。
我的头文件：
//Gradebook 6 Header
//Purpose is to be the class declaration for the class Gradebook 6
//Declare public, privates, and function names.
#include //the standard c++ string class library
using std::string;
//define the class gradebook
class GradeBook
{
public: //all the public functions in the class
GradeBook(string ); //constructor expects string input
void setCourseName (string ); //method sets course name--needs string input
string getCourseName(); //function returns a string value
void displayMessage(); //to console
private: //all private members of the class
string courseName;
}; //ends the class declaration 我的 .cpp 文件是：
//Gradebook 6
// The actual implementation of the class delcaration in gradebook6.h
#include
using std::cout;
using std::endl;
#include "gradebook6.h" //include the class definition
//define the class gradebook
GradeBook::GradeBook(string name) //constructor expects string input
{
setCourseName(name); //call the set method and pass the input from the constructor.
}
void GradeBook::setCourseName (string name) //method sets course name--needs string input
{
courseName = name; //sets the private variable courseName to the value passed by name
}
string GradeBook::getCourseName() //function returns a string value
{
return courseName;
}
void GradeBook::displayMessage() //function does not return anything but displays //message to console
{
cout //message here, the pre tag isn't letting it display
} //end function displayMessage
最后是我写的实现接口并测试的测试文件。
// Gradebook6 Test
// Program's purpose is to test our GradeBook5 header file and file seperated classes
#include
using std::cout;
using std::endl;
#include "gradebook6.h" //including our gradebook header from the local file.
//being program
int main()
{
//create two gradebook objects
GradeBook myGradeBook1 ("CSC 101 Intro to C++ Programming"); //create a default object using the default constructor
GradeBook myGradeBook2 ("CSC 102 Data Structures in C++");
//display intitial course name
cout //another output message here that the code tag does not like
return 0;
}