VC++,执行 link.exe 时出错

贴出代码:
// Fig. 3.13: fig03_13.cpp
// GradeBook class demonstration after separating
// its interface from its implementation.
#include <iostream>
using std::cout;
using std::endl;

#include "GradeBook.h" // include definition of class GradeBook

// function main begins program execution
int main()
{
// create two GradeBook objects
GradeBook gradeBook1( "CS101 Introduction to C++ Programming" );
GradeBook gradeBook2( "CS102 Data Structures in C++" );

// display initial value of courseName for each GradeBook
cout << "gradeBook1 created for course: " << gradeBook1.getCourseName()
<< "\ngradeBook2 created for course: " << gradeBook2.getCourseName()
<< endl;
return 0; // indicate successful termination
} // end main

// Fig. 3.12: GradeBook.cpp
//

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