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POAccess Violation
 

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plurals
  1. POAccess Violation
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    <p>Greetings everyone, going to need some help in clearing this exception.</p> <p>I get the following when debugging my compiled program in Microsoft Visual C++ 6.0:</p> <pre><code>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. </code></pre> <p>Here are the relevant screenshots from the debugger.</p> <p>Showing ostream.h:</p> <p>http://img237.imageshack.us/my.php?image=accessviolation.png'>http://img237.imageshack.us/img237/1116/accessviolation.th.png' border='0'/></p> <p>Showing main.ccp:</p> <p>http://img509.imageshack.us/my.php?image=accessviolation2.png'>http://img509.imageshack.us/img509/3619/accessviolation2.th.png' border='0'/></p> <p>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:</p> <p>main.ccp</p> <pre><code>#include &lt;iostream&gt; #include "SA.h" using namespace std; // For the use of text generation in application int main() { SimAnneal Go; cout &lt;&lt; "Quadratic Function" &lt;&lt; endl &lt;&lt; "Solving method: Simulated Annealing" &lt;&lt; endl; cout &lt;&lt; "\nSelect desired Initial Temperature:" &lt;&lt; endl &lt;&lt; "&gt; "; cin &gt;&gt; Go.T_initial; cout &lt;&lt; "\nSelect desired number of Temperature Iterations:" &lt;&lt; endl &lt;&lt; "&gt; "; cin &gt;&gt; Go.N_max; cout &lt;&lt; "\nSelect desired number of step Iterations:" &lt;&lt; endl &lt;&lt; "&gt; "; cin &gt;&gt; Go.N_step; cout &lt;&lt; "\nSelect desired Absolute Temperature:" &lt;&lt; endl &lt;&lt; "&gt; "; cin &gt;&gt; Go.T_abs; Go.LoadCities(); Go.Initialize(); Go.SA(); system ("PAUSE"); return 0; } </code></pre> <p>SA.h</p> <pre><code> #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 </code></pre> <p>SA.cpp</p> <pre><code>#include &lt;math.h&gt; #include &lt;iostream&gt; #include &lt;fstream&gt; #include &lt;iterator&gt; #include &lt;iomanip&gt; #include &lt;time.h&gt; #include &lt;cstdlib&gt; #include "SA.h" using namespace std; void SimAnneal::SA() { T = T_initial; E_current = E_initial; for ( int N_temperatures = 1 ; N_temperatures &lt;= N_max ; N_temperatures++ ) { Metropolis(T, N_step, N_temperatures); T = Schedule(T, N_temperatures); if (T &lt;= T_abs) break; } cout &lt;&lt; "\nResults:" &lt;&lt; endl &lt;&lt; "Distance&gt; " &lt;&lt; E_current &lt;&lt; endl &lt;&lt; "Temperature&gt; " &lt;&lt; T &lt;&lt; endl; OrderList(S_order); } void SimAnneal::Metropolis(double T_current, int N_Steps, int N_temperatures) { for ( int i=1; i &lt;= 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 &lt;= 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 &lt; 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 &lt; 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 &lt; 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 &lt; 15; i++) { S_order [i] = S_trial [i]; } } void SimAnneal::OrderInt () { for (int i = 0; i &lt;15; i++) { S_order [i] = i; } } void SimAnneal::OrderTrial () { for (int i = 0; i &lt; 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 &lt;= 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 &lt;&lt; "Array List : " &lt;&lt; endl; for (int i = 0; i &lt; 15; i++) { cout &lt;&lt; " &gt; " &lt;&lt; array[i] &lt;&lt; endl; } cout &lt;&lt; "End of array" &lt;&lt; endl; } void SimAnneal::LoadCities () { int x, y; for (y = 0; y &lt; 15; y++) { for (x = 0; x &lt; 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 &lt; 15; y++) { for (x = 0; x &lt; 15; x++) { if (y &gt; 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; } </code></pre> <p>Any Assistance would be much appriciated. I'm all out of ideas myself.</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USRaugnar
    1. USRaugnar
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    2. PO
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      1. PTAnswer
    3. PO
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    1. VO
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      1. POAccess Violation
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThis compiles and runs fine on VS2008. Don't think the problem is with the code unless it's a VC6 compiler bug.
      singulars
      1. POAccess Violation
      1. USdrby
    2. COCan you please provide the input values that you are using when the crash happens ?
      singulars
      1. POAccess Violation
      1. USJoão Augusto
    3. COAre you sure you didn't compile one module with one compiler and another with the other? Do a clean and see if the error goes away. Also looks like you aren't checking input ranges (T_Initial > 0 and T_abs < 0 could be bad if T_current = 0).
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      1. POAccess Violation
      1. USjohnny
 

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