// Fig. 3.3: fig03_03.cpp
// Define class GradeBook with a member function that takes a parameter;
// Create a GradeBook object and call its displayMessage function.
#include <iostream>
#include <string> // program uses C++ standard string class
usingnamespace std;
// GradeBook class definition
class GradeBook
{
public:
// function that displays a welcome message to the GradeBook user
void displayMessage( string courseName )
{
cout << "Welcome to the grade book for\n" << courseName << "!"
<< endl;
} // end function displayMessage
}; // end class GradeBook
// function main begins program execution
int main()
{
string nameOfCourse; // string of characters to store the course name
GradeBook myGradeBook; // create a GradeBook object named myGradeBook
// prompt for and input course name
cout << "Please enter the course name:" << endl;
getline( cin, nameOfCourse ); // read a course name with blanks
cout << endl; // output a blank line
// call myGradeBook's displayMessage function
// and pass nameOfCourse as an argument
myGradeBook.displayMessage( nameOfCourse );
} // end main
Why is this not working. it gave me error undefined reference to 'main'
