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Undefined Reference to

Feb 27, 2012 at 6:20pm
Oswld (18)
Hello, I am having trouble when I compile my program. When i try to create an object from a type i defined in a class i made, this case student, it gives me the undefined error. I'm using a makefile to compile but I don't know it its right since this is the first time i get to use it.

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Project1.o: Project1.cpp std_lib_facilities.h Student.h Courses.h StudentCourses.h GroupOfStudents.h Menu.h
	g++ Project1.cpp -o Project1.o


This is the .cpp file, I just tried defining an object but it doesnt work.

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#include "std_lib_facilities.h"

#include "Student.h"
#include "Courses.h"
#include "StudentCourses.h"
#include "GroupOfStudents.h"
#include "Menu.h"


int main()
{
	
	Student student;

}
Edit & run on cpp.sh


Help in this matter would be really appreciated!
Last edited on Feb 28, 2012 at 12:20am
Feb 27, 2012 at 6:31pm
hanst99 (2869)

This is the .cpp file, I just tried defining an object but it doesnt work.


I assume the error reads something like
Undefined reference to: Blah
?

That's a linker error, it means you declared something without providing a definition for it (maybe it's in another file). Please post the full error message.
Feb 27, 2012 at 6:53pm
Oswld (18)
Oh sorry, this is the error message:

In function 'main': undefined reference to 'Student::Student[in-charge]()
collect2: ld returned 1 exit status
Feb 27, 2012 at 10:29pm
Oswld (18)
This is also what i have for the Student.h file

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#ifndef _STUDENT_H_
#define _STUDENT_H_


#include "std_lib_facilities.h"

class Student{
	public:
	
	Student();
	Student(string f, string l, string i)
		:firstName(f), lastName(l), ID(i){}
	
	string get_ID(){return ID;};
	string get_lastName(){return lastName;};
	string get_firstName(){return firstName;};
	
	void display(){ cout << firstName<< " " <<lastName<< " " << ID << endl;};
	
	friend ostream & operator<<(ostream &stream, Student s);
	
	private:
	
	string firstName;
	string lastName;
	string ID;
	
};

ostream &operator<<(ostream &stream, Student s)
{
	stream << s.firstName << " ";
	stream << s.lastName<< " ";
	stream << s.ID << " " <<endl;

	return stream;	
}
#endif
Feb 28, 2012 at 1:56am
Oswld (18)
Found the problem.
Mar 5, 2012 at 11:30pm
mustafakishk (1)
hi .. would you please tell me what was the problem
i'm having the same problem in my code
thnx in advance
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