Question

Greetings everyone, going to need some help in clearing this exception.

I get the following when debugging my compiled program in Microsoft Visual C++ 6.0:

Loaded 'ntdll.dll', no matching symbolic information found. Loaded 'C:\WINDOWS\system32\kernel32.dll', no matching symbolic information found. Loaded 'C:\WINDOWS\system32\tsappcmp.dll', no matching symbolic information found. Loaded 'C:\WINDOWS\system32\msvcrt.dll', no matching symbolic information found. Loaded 'C:\WINDOWS\system32\advapi32.dll', no matching symbolic information found. Loaded 'C:\WINDOWS\system32\rpcrt4.dll', no matching symbolic information found. First-chance exception in SA.exe: 0xC0000005: Access Violation. 

Here are the relevant screenshots from the debugger.

Showing ostream.h:

http://img237.imageshack.us/my.php?image=accessviolation.png’>http://img237.imageshack.us/img237/1116/accessviolation.th.png’ border=’0’/>

Showing main.ccp:

http://img509.imageshack.us/my.php?image=accessviolation2.png’>http://img509.imageshack.us/img509/3619/accessviolation2.th.png’ border=’0’/>

I’ve tried to scour my code for null pointers and have also tried to ignore the exception with no luck. Here are the three main components of my script:

main.ccp

#include <iostream>  #include 'SA.h'   using namespace std; // For the use of text generation in application   int main()  {     SimAnneal Go;      cout << 'Quadratic Function' << endl          << 'Solving method: Simulated Annealing' << endl;      cout << '\nSelect desired Initial Temperature:' << endl          << '> ';     cin >> Go.T_initial;      cout << '\nSelect desired number of Temperature Iterations:' << endl          << '> ';     cin >> Go.N_max;      cout << '\nSelect desired number of step Iterations:' << endl          << '> ';     cin >> Go.N_step;      cout << '\nSelect desired Absolute Temperature:' << endl          << '> ';     cin >> Go.T_abs;      Go.LoadCities();      Go.Initialize();      Go.SA();      system ('PAUSE');      return 0; } 

SA.h

    #ifndef SA_H     #define SA_H   class SimAnneal {          double S_order [15];                 double S_trial [15];                  int SwapNum1;         int SwapNum2;          double CityArray [15][15];          double E_initial;         double E_current;          double T;          void Metropolis (double, int, int);         void Next_State (double, int);         double Schedule (double, int);         double ObjFunction (double CityOrder []);          void EquateArray ();         void OrderInt ();         void OrderTrial ();         void OrderList (double array[]);          void WriteResults (double, double, double, double, double);        public:         int N_step;         int N_max;          double T_initial;         double T_abs;          void SA ();         void Initialize ();         void LoadCities ();     };       double Random_Number_Generator(double nHigh, double nLow);   #endif   

SA.cpp

#include <math.h> #include <iostream> #include <fstream>           #include <iterator> #include <iomanip> #include <time.h>            #include <cstdlib>            #include 'SA.h'  using namespace std;   void SimAnneal::SA()  {     T = T_initial;     E_current = E_initial;           for ( int N_temperatures = 1 ; N_temperatures <= N_max ; N_temperatures++ )         {             Metropolis(T, N_step, N_temperatures);             T = Schedule(T, N_temperatures);          if (T <= T_abs)             break;         }      cout << '\nResults:' << endl     << 'Distance> ' << E_current << endl     << 'Temperature> ' << T << endl;      OrderList(S_order); }  void SimAnneal::Metropolis(double T_current, int N_Steps, int N_temperatures) {     for ( int i=1; i <= N_step; i++ )                    Next_State(T_current, N_temperatures);       }  void SimAnneal::Next_State (double T_current, int i)  {     OrderTrial();      double EXP = 2.718281828;      double E_t = ObjFunction(S_trial);     double E_c = ObjFunction(S_order);      double deltaE = E_t - E_c;                                       if ( deltaE <= 0 )         {             EquateArray();         E_current = E_t;     }         else         {         double R = Random_Number_Generator(1,0);         double Ratio = 1-(float)i/(float)N_max;                  double ctrl_pram = pow(EXP, (-deltaE / T_current));              if (R < ctrl_pram*Ratio)                                     {                EquateArray();             E_current = E_t;         }         else              E_current = E_c;     } }  double SimAnneal::Schedule (double Temp, int i)  {     double CoolingRate = 0.9999;      return Temp *= CoolingRate;  }  double SimAnneal::ObjFunction (double CityOrder [])  {     int a, b;      double distance = 0;      for (int i = 0; i < 15 - 1; i++)     {         a =  CityOrder [i];         b =  CityOrder [i + 1];          distance += CityArray [a][b];     }      return distance; }  void SimAnneal::Initialize ()  {     int a, b;      double distance = 0;      OrderInt();      for (int i = 0; i < 15 -1; i++)     {         a =  S_order [i];         b =  S_order [i + 1];          distance += CityArray [a][b];     }      E_initial = distance; }  void SimAnneal::EquateArray ()  {     for (int i = 0; i < 15; i++)     {         S_order [i] = S_trial [i];     } }  void SimAnneal::OrderInt ()  {     for (int i = 0; i <15; i++)     {         S_order [i] = i;     } }  void SimAnneal::OrderTrial ()  {     for (int i = 0; i < 15; i++)     {         S_trial [i] = S_order [i];     }      SwapNum1 = (int)Random_Number_Generator(15, 0);              SwapNum2 = (int)Random_Number_Generator(15, 0);      for (int n = 0; n <= 100000; n++)                            {         SwapNum2 = (int)Random_Number_Generator(15, 0);           if ( SwapNum1 != SwapNum2 )             break;     }      S_trial [SwapNum1] = S_order [SwapNum2];     S_trial [SwapNum2] = S_order [SwapNum1]; }  void SimAnneal::OrderList (double array[])  {     cout << 'Array List : ' << endl;     for (int i = 0; i < 15; i++)     {         cout << ' > ' << array[i] << endl;     }      cout << 'End of array' << endl; }  void SimAnneal::LoadCities ()  {     int x, y;      for (y = 0; y < 15; y++)                         {             for (x = 0; x < 15; x++)                     {                   if (x == y)             {   CityArray[x][y] = 0.0;               }             else if (x != y)             {   CityArray[x][y] = Random_Number_Generator(7, 1);              }         }       }        for (y = 0; y < 15; y++)      {             for (x = 0; x < 15; x++)          {                   if (y > x)                 CityArray[y][x] = CityArray[x][y];         }       }   }  double Random_Number_Generator(double nHigh, double nLow) {     double fr = ((rand() % ((int)nHigh*1000 - (int)nLow*1000 + 1)) + nLow) / 1000;      return fr; } 

Any Assistance would be much appriciated. I’m all out of ideas myself.

Answer 1

The code you posted wouldn’t even compile:

1)

cin >> Go.Write; 

There’s no such variable in the SimAnneal class.

2)

Go.SA(Go.Write) 

Your SA method doesn’t accept any parameters.

Another thing is, why don’t you run your project in debug mode directly in VC++ 6.0? The VS on the screenshots is clearly 200*X*.

According to the screenshots, you’re crashing on the line:

cout << 'Quadratic Function' << endl      << 'Solving method: Simulated Annealing' << endl; 

Which doesn’t make much sense, unless your output stream is mutilated in some way. Have you tried watching the console before the crash occurs?