Undefined Symbol

[jakemc321]

I'm working on a project and I keep coming across this error. Any help would be wonderful.

void Menu::read_students()
	{
		cout<<"Please input the name of the file you would like to read in:"<<endl;
		string file_name;
		cin>>file_name;
		
		ifstream ist(file_name.c_str());
		if(!ist) 
			cerr<<" Unable to open the file: "<<file_name<<endl;

		vector<int>hw_temp;
		vector<int>test_temp;
		vector<int>q_temp;

		int t_quiz;
		int t_hw;
		int t_test;

		string f_name;
		string l_name;
		string id_temp;
		vector<StudentCourses>stdc_vec;

		while(!ist.eof())
		{
			ist>>f_name>>l_name>>id_temp;

			cout<<id_temp<<" "<<f_name<<" "<<l_name;

			for(int i=0; i<10; ++i)
			{
				ist>>t_quiz;
				q_temp.push_back(t_quiz);
			}
			for(int j=0; j<6; ++j)
			{
				ist>>t_hw;
				hw_temp.push_back(t_hw);
			}
			for(int k=0; k<4; ++k)
			{
				ist>>t_test;
				test_temp.push_back(t_test);
			}
			Student temp_student(f_name, l_name, id_temp);
			Courses temp_courses(q_temp, hw_temp, test_temp);
			StudentCourses s_course(temp_student, temp_courses);
			stdc_vec.push_back(s_course);

		}

		
	}

#ifndef _STUDENTCOURSES_H_
#define _STUDENTCOURSES_H_

#include "Student.h"
#include "Courses.h"
#include "std_lib_facilities.h"

class StudentCourses
{
public:
   Student student;
   Courses courses;

   Student get_student() const { return student; }
   StudentCourses() {}
   StudentCourses(Student s, Courses c);
   double get_final_score() const;
   void display() const;
};

#endif 

The error I am getting is:

Undefined first referenced
symbol in file
StudentCourses::StudentCourses(Student, Courses)/var/tmp//cchs2k3B.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status
So I attached the StudentCourses.h file and the void function that contains the error.

[ne555]

Probably you didn't include the cpps in your project, so your IDE is not linking them.

[jakemc321]

Could you be more specific? I have all my header files and cpps in a folder and I am compiling in unix using g++ *.cpp.

[ne555]

It's a linker issue.
It does not found the definition of the student_courses constructor. Student temp_student(f_name, l_name, id_temp);
So check out StudentCourses.cpp

Undefined                                                                first referenced
symbol                                                                    in file
StudentCourses::StudentCourses(Student, Courses)                /var/tmp//cchs2k3B.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status