Program goes into infinite loop, showing weird characters

[b1b2b3b4]

After I successfully read in and stored my datas. When I press 2 to change my filtering criteria, changing it to a, b or c it is fine and working but whenever I chooses 'd'. It goes into this mad infinite loop showing weird characters and then hangs.

Here is my code

//all other stuff;
class Assn3
{ 
    private:
             
    int FC;
    int SC;
    int SO;
//vectors
    public:
   	Assn3();
   	void mainMenu(); 
   	void inputFile();
   	void viewData();
   	void outputFile();
   	
    char FM();
    string getFC();
   	void setFC();
   	void processFilter(char choice);
    void point2D();
	void point3D();
	void line2D();
	void line3D();
   	
	char SM();
	string getSC();
	void setSC();
	void processSorting(char choice);
	void pt1();
	void pt2();
	void length();
	
	char SOM();
	string getSO();
	void setSO();
	void processSortingorder(char choice);
	void asc();
	void dsc();
};

Assn3::Assn3()
{
	FC = 1;
	SC = 1;
	SO = 1;
}

//main menu
void Assn3::mainMenu()
{
    cout<<"1) Read in data."<<endl;
    cout<<"2) Specify filtering criteria (current: "<<getFC()<<")"<<endl;
    cout<<"3) Specify sorting criteria (current : "<<getSC()<<")"<<endl;
    cout<<"4) Specify sorting order (current: "<<getSO()<<")"<<endl;
    cout<<"5) View Data"<<endl;
    cout<<"6) Store Data"<<endl;

	cout<<"Please enter  : ";
}

//filter menu
char Assn3::FM()
{
    char o;
	cout<<"[ Specifying filtering criteria (current : "<<getFC()<<") ]"<<endl<<endl;
	cout<<"a) Point2D "<<endl;
	cout<<"b) Point3D "<<endl;
	cout<<"c) Line2D "<<endl;
	cout<<"d) Line3D  "<<endl<<endl;
	cout<<"Please enter  (a - d) : ";
	cin>>o;

	return o;
}

//sort menu
char Assn3::SM()
{
	char o;
	switch(FC)
	{
	case 1:
		cout<<"[ Specifying sorting criteria (current : "<<getSC()<<") ]"<<endl<<endl;
		cout<<"a)	ordinate Value "<< endl;
		cout<<"b)	ordinate Value "<< endl;
		cout<<"c)	st. Fr Origin Value "<< endl<<endl;
		cout<<"Please enter  (a - c) : ";
		cin>>o;
		break;
	case 2:
		cout<<"[ Specifying sorting criteria (current : "<<getSC()<<") ]"<<endl<<endl;
		cout<<"a) X Value "<<endl;
		cout<<"b) Y Value "<<endl;
		cout<<"c) Z Value "<<endl;
		cout<<"d) Dist. Value "<<endl<<endl;
		cout<<"Please enter  (a - d) : ";
		cin>>o;
		break;
	case 3:
		cout<<"[ Specifying sorting criteria (current : "<<getSC()<<") ]"<<endl<<endl;
		cout<<"a) Pt. 1 values "<< endl;
		cout<<"b) Pt. 2 values "<< endl;
		cout<<"c) Length value "<<endl<<endl;
		cout<<"Please enter  (a - c) : ";
		cin>>o;
		break;
	}
	return o;	 
}

//sort order menu
char Assn3::SOM()
{
    char o;
	cout<<"[ Specifying sortin order (current : "<<getSO()<< ") ]"<<endl<<endl;
	cout<<"a)ASC  "<<endl;
	cout<<"b)DSC  "<<endl<<endl;
	cout<<"Please enter  (a - b) : ";
	cin>>o;

	return o;

	cout << "Sorting set to '" << getSO() << "'!" << endl;
}
//for filter criteria
string Assn3::getFC()
{
	switch(FC)
	{
	case 1:
		return "Point2D";
		break;
	case 2:
		return "Point3D";
		break;
	case 3:
		return "Line2D";
		break;
	case 4:
		return "Line3D";
		break;
	}
}

//for filter criteria
void Assn3::setFC()
{
	char o;
	o = FM();
	processFilter(o);

	cout << "Filter criteria  set to '" << getFC() << "'!" << endl;
}

void Assn3::point2D()
{
	FC = 1;
}

void Assn3::point3D()
{
	FC = 2;
}

void Assn3::line2D()
{
	FC = 3;
}

void Assn3::line3D()
{
	FC = 4;
}
void Assn3::processFilter(char choice)
{
	switch(choice) 
	{
	case 'a' :
		point2D();
		break;
	case 'b' :
		point3D();
		break;
	case 'c' :
		line2D();
		break;
	case 'd' :
		line3D();
		break;
	}
}

string Assn3::getSC()
{
	switch(FC)
	{
	case 1:
		switch(SC)
		{
		case 1:
			return "X-ordinate";
		case 2:
			return "Y-ordinate";
		case 3:
			return "Dist. Fr Origin Value";
		}
		break;
	case 2:
		switch(SC)
		{
		case 1:
			return "X-ordinate";
		case 2:
			return "Y-ordinate";
		case 3:
			return "Dist. Fr Origin Value";
		}
		break;
	case 3: 
		switch(SC)
		{
		case 1:
			return "Pt. 1's (x, y)";

		case 2:
			return "Pt. 2's (x, y) values";

		case 3:
			return "Length value";
		}
		break;
	}
}

void Assn3::setSC()
{
	char o;
	o = SM();
	processSorting(o);

}

void Assn3::pt1()
{
	SC = 1;
}

void Assn3::pt2()
{
	SC = 2;
}

void Assn3::length()
{
	SC = 3;
}

void Assn3::processSorting(char choice)
{
	switch(choice) 
	{
	case 'a' :
		pt1();
		break;
	case 'b' :
		pt2();
		break;
	case 'c' :
		length();
		break;
	}
}

string Assn3::getSO()
{
	switch(SO)
	{
	case 1:
		return "ASC";
		break;
	case 2:
		return "DSC";
		break;	  	  
	}
}

void Assn3::setSO()
{
	char o;
	o = SOM();
	processSortingorder(o);
	cout << "Filter criteria  set to '" << getSO() << "'!" << endl;
}

void Assn3::asc()
{
	SO = 1;
}

void Assn3::dsc()
{
	SO = 2;
}

void Assn3::processSortingorder(char choice)
{
	switch(choice) 
	{
	case 'a' :
		asc();
		break;

	case 'b' :
		dsc();
		break;
	}
}

void Assn3::inputFile()
{
     ifstream openfile;
     string getcontent;	
     int count = 0;
     
     cout<<endl;
     cout<<"Please enter filename : ";
     cin>>getcontent;
     openfile.open(getcontent.c_str());
     if (openfile.fail())
     {
      cerr<<"Error with file:" <<getcontent.c_str()<<endl;
      return;
     }
     while (openfile.good())
     {     
           string line;
           openfile>>line;
           	 
           if(line == "Point2D,")
           {	
             Point2D p2d;
             openfile >> p2d; 
             p2ds.push_back(p2d); 
             count++;
             p2ds.erase( unique( p2ds.begin(), p2ds.end()), p2ds.end());  	     	 	 
            }
            else if (line == "Point3D,")
		    {
			     Point3D p3d;
			     openfile >> p3d; 
                 p3ds.push_back(p3d); 
			     count++;
                 p3ds.erase( unique( p3ds.begin(), p3ds.end()), p3ds.end());  	 
		    } 
            else if (line == "Line2D,")
		    {
			     Line2D l2d;
			     openfile >> l2d;
			     l2ds.push_back(l2d); 
			     count++;
                 l2ds.erase( unique( l2ds.begin(), l2ds.end()), l2ds.end());  
		    }
            else if (line == "Line3D,")
		    {
			     Line3D l3d;
			     openfile >> l3d;
			     l3ds.push_back(l3d); 
			     count++;
                 l3ds.erase( unique( l3ds.begin(), l3ds.end()), l3ds.end()); 
		   }       	
      }
      openfile.close();
}

void Assn3::viewData()
{
       cout<<"[ View data ... ]"<< endl;
       cout<<"filtering criteria : " <<getFC() << endl;
       cout<<"sorting criteria : " <<getSC() << endl;
       cout<<"sorting order : " <<getSO() << endl;
       switch(FC)
       {
       case 1:
 			//show all Point2D datas
      	    cout<<" X  Y  Dist. Fr Origin"<<endl;
            for(int i = 0; i < p2ds.size(); i++)
            {
	        	cout<<p2ds[i]<<"\t"<<setprecision(3)<<p2ds[i].getScalarValue()<<endl;
            }
            break;   
       case 2:
			//show all Point3D datas
			cout<<" X  Y  Z  Dist. Fr Origin"<<endl;
 
			for(int i = 0; i < p3ds.size(); i++)
			{
				cout<<p3ds[i]<<"\t"<< setprecision(3)<<p3ds[i].getScalarValue()<<endl;
			}
			break;
	   case 3:
	   		//show all line2d datas
			cout<<" P1-X  P1-Y  P2-X  P2-Y  Length"<<endl;
 
			for(int i = 0; i < l2ds.size(); i++)
			{
				cout << l2ds[i] << endl;
			}
			break;
	  case 4:
			cout<<" P1-X  P1-Y  P1-Z  P2-X  P2-Y  P2-Z  Length"<<endl;
 
			for(int i = 0; i < l3ds.size(); i++)
			{
				cout << l3ds[i] << endl;
			}
			break;
       }
}

int main()
{
    Assn3 assn3;
 	int choice; 
    bool exit;
	const int END = 999;

	while (choice != END)
	{
        assn3.mainMenu();
        cin>>choice;
        
	 	switch(choice)
		{
			case 1:
			{
                assn3.inputFile();
			}
			break;
			case 2 :
           	{
                assn3.setFC();
			}
            break;
		  	case 3 :
			{
  	          	assn3.setSC();
            }
            break;
			case 4:
			{
               	assn3.setSO();	  
			}
            break;
			case 5:
			{
              	assn3.viewData();
			}
            break;
			case 6:
			{
              	assn3.outputFile();
			}
			break;
		default:
			{
				cout<<"Invalid entry"<<endl<<endl;	   
			}
			break;           
		}
	}	 	 return 0;
}
#endif 

[b1b2b3b4]

Anyone can help? Whenever I press 2 to select the filter criteria and change it to 'd', the program will hang straight away

[firedraco]

Have you tried debugging the program to see where it is when it is hanging?

[b1b2b3b4]

I didn't. How do I start debugging? I am using quincy 2005