Thread: Dynamic Memory Alloctaion help

Hello,

Im having a problem with putting output from a file onto the screen. It compiles fine with no errors but when i run it, no output is shown on the screen. This is kinda new to me doing it like this. Did I do something wrong in the code because it seems fine? Any help would be much appreciated. Thanks in advance!

Code:

salesData* loadArray (ifstream& fsInventoryFile)
{
   salesData* headPointer;
   salesData* currentPointer;
   salesData record;
   int readOk;
   readOk = readARec(fsInventoryFile, record); //this function is fine
   while(readOk)
   {
      currentPointer = new salesData;
      headPointer = currentPointer;
      *(currentPointer)=record;
      (currentPointer)->next=headPointer;
      readOk = readARec(fsInventoryFile, record);
   }
    cout <<"loadArray"<<endl;
    return currentPointer;
}


void displayArray (salesData* headPointer)
{
    int i=0;
    salesData* currentPointer = headPointer;
   while (currentPointer != NULL)
   {
      cout <<i+1 <<")\t";
      cout <<setw(9) <<currentPointer->itemCode
              <<setw(17) <<&(currentPointer->itemCode);
     cout.unsetf(ios::left);
     cout <<setw(2) <<currentPointer->quantity;
     cout.setf(ios::left);
    cout <<setw(4) << " " 
            <<setw(14) <<&(currentPointer->quantity)
            <<setw(8) <<currentPointer->price
            <<&(currentPointer->price)
            <<endl;
             currentPointer = currentPointer->next;
	i++;
	}

	cout <<endl <<endl;

	return;
}

I believe you cannot do while(readOk), I think you can only do this will bool statements and not ints...

I tried that...nothing happened. But thanks for the thought...

I'll post the rest of the code just in case it is needed....

Code:

struct salesData
{
	char itemCode[8];
	int quantity;
	float price;
	//-------------
	salesData *next;	//record pointer
};

salesData* loadArray (ifstream& fsInventoryFile);
void displayArray (salesData* headPointer);
int readARec(ifstream& fsInventoryFile,salesData& record);

const int SIZE = 100;

void main (void)
{
  ifstream fsInventoryFile;
  char filePath[80] = "a:\\in05.01";
  salesData *headPointer=NULL;
  salesData *currentPointer=NULL;
  headPointer=currentPointer;
  
  fsInventoryFile.open(filePath);
   if(!fsInventoryFile)
   {
	cout <<"Unable to open: " <<filePath <<endl;
   }
   else
   {
     headPointer = loadArray (fsInventoryFile);
     displayArray (headPointer);
     fsInventoryFile.close();
    }

}// end of main

// code from above post here

int readARec(ifstream& fsInventoryFile, salesData& record)
{
   bool readOk = 1;
   fsInventoryFile >> record.quantity
	                >> record.price
	                >> record.itemCode;
   if ((fsInventoryFile.eof()) || (fsInventoryFile.fail()))
	{
	readOk=0;
	}

   return readOk;
}//end readARec

Thanks for your help.... I found out it is suppose to go backwards as a link list... i will try and play around with it to see if i can make it work as it is suppose too...or any help is always nice...Thanks again!