runtime error (leak?)

My program crashes on like the 3rd line. It outputs the first 3 lines fine , but when it gets to actually modeling thats when it crashes. I cant figure it out in the debugger.

Code:

#include <iostream>
#include <string>
#include <fstream>
#include <vector>
using namespace std;

class Section;
class LabWorker;
class TimeSlot;
class StudentRecord;


class TimeSlot
{
	public:
		TimeSlot(string day,unsigned hour):day(day),hour(hour)
		{}
		void display(ostream & out)const;
	private:
		string day;
		unsigned hour;
};


void TimeSlot::display(ostream & out)const
{
	out<<day<<" "<<hour;
}
class LabWorker
{
	public:
		LabWorker(string name):name(name){}
		void addSection(Section * sect);
		void addGrade(string name,int grade,unsigned week);
		void displayAverageForWeek(unsigned week)const;
	private:
		string name;
		Section* assignedSection;
};
class StudentRecord
{
	public:
		StudentRecord(string name):name(name),grades(13,-1)
		{}
		string getName(){return name;}
		void setGrade(int grade,unsigned week);
		vector <int> getGrades(){return grades;}
	private:
		string name;
		vector <int> grades;
};

class Section
{
	friend ostream& operator <<(ostream&,const Section&);
	
	public:
		Section(string ID, string day,unsigned hour):sectionID(ID),slot(day,hour)
		{}
		void addInstructor(LabWorker instr);
		void loadStudentsFromFile(string file);
		void displayStudents();
		StudentRecord* getStudentRecord(string name);
		vector <StudentRecord*> getRecords()const{return records;}
	private:
		string sectionID;
		TimeSlot slot;
		LabWorker* instructor;
		vector <StudentRecord*> records;
};

StudentRecord* Section::getStudentRecord(string name)
{
	for(size_t i=0;i<records.size();i++)
	{
		if(records[i]->getName() == name)
			return records[i];
	}
	return NULL;
}
void Section::displayStudents()
{
	for(size_t i=0;i<records.size();i++)
	{
		cout << records[i]->getName() << "\n";
	}
}
void Section::loadStudentsFromFile(string file)
{
	ifstream infile;
	infile.open(file.c_str());
	if(!infile)
	{
		cerr<<"Error Terminating Program\n";
		exit(1);
	}
	string name;
	while(infile>>name)
	{
		records.push_back(new StudentRecord(name));
	}
}
void Section::addInstructor(LabWorker instr)
{
	instructor = &instr;
	instructor ->addSection(this);
}
void StudentRecord::setGrade(int grade,unsigned week)
{
	grades[week]=grade;
}

ostream & operator <<(ostream& out,const Section& sect)
{
	out<<sect.sectionID;
	sect.slot.display(out);
	return out;
}
void LabWorker::displayAverageForWeek(unsigned week)const
{
	int grades(0),count(0);
	vector <StudentRecord*> rcrds=assignedSection->getRecords();
	
	for(size_t i=0;i<rcrds.size();i++)
	{
		vector <int> gds = rcrds[i]->getGrades();
		grades += gds[week];
		count++;
	}
	cout<<"The average for week number "<<week<<" is "<<grades/count;
}
void LabWorker::addSection(Section * sect)
{
	assignedSection = sect;
}
void LabWorker::addGrade(string name,int grade,unsigned week)
{
	StudentRecord* temp = assignedSection->getStudentRecord(name);
	if(!temp)
		cerr<<"Student doesn't exist\n";
	else
		temp->setGrade(grade,week);
}

int main() 
{
   // lab workers
   LabWorker joe( "Joe" );
   LabWorker jane( "Jane" );
   
   // sections and setup
   Section secA2( "A2", "Tuesday", 4 );
   secA2.addInstructor( joe );
   secA2.loadStudentsFromFile( "A2Data.txt" );
   //secA2.display();
   cout << secA2 << endl;
   Section secB3( "B3", "Thursday", 11 );
   secB3.addInstructor( jane );
   secB3.loadStudentsFromFile( "sectData.txt" );
   //secB3.display();
   cout << secB3 << endl;

   // week one activities
   cout << "Modeling week: 1\n";
   joe.addGrade( "Bob", 7, 1 );  
   joe.addGrade( "Tania", 9, 1 );  
   joe.addGrade( "Joe", 7, 1 );  
   joe.addGrade( "Sue", 7, 1 );  
   cout << "End of week one\n";
   joe.displayAverageForWeek(1);

   // week two activities
   cout << "Modeling week: 1\n";
   joe.addGrade( "Tania", 5, 2 );  
   joe.addGrade( "Bob", 10, 2 );  
   joe.addGrade( "Sue", 0, 2 );  
   cout << "End of week two\n";
   joe.displayAverageForWeek(2);

   // test that week 1 still works
   cout << endl;
   joe.displayAverageForWeek(1);

}

I posted the whole code because i dont know exactly whats wrong. Here is a link to the problem in case you need to check what it should print and it also has the two files.

http://cis.poly.edu/cs1124/Recitatio...on5/rec05.html

Looks like you need to call addSection before you call addGrade. Although that looks a bit dangerous because what if the object that you pass to addSection goes out of scope/is destroyed before the LabWorker object?

maybe i should have also mentioned i cant change main.. main was given to us .. our goal was to make a class that allowed main to work

Why are the member variables assignedSection and instructor pointers? Notice that in main a pointer isn't passed to the add methods.

I don't see a reason to use pointers at all here. If you remove them (and update everything else to compile properly), your code just might work.

Thats actually how are TA told us to do it. I dont c how to do it without it if the classes are associated with each other.

OK, you're right. Didn't notice that.

Only one of those needs to be a pointer to avoid the circular usage, the other can be a regular object. Try just making the instructor a regular object.

I did what u said b4 u edited the post lol and it works fine i didnt realize that thanks alot.