Wrong in my code

Question

mbouster 0 Light Poster

13 Years Ago

Dear all
I have the following code

void initializeData()
{
	Customers *CustArray;
	CustArray=new Customers[150];//allocate 150 memory locations of class Customers  
	Flights *FL=new Flights[150];
	}
/*End Initialize Data fuction*/
/**********************************************************************************************************************************/
/*Backup Menu implementation*/

void backupfiledefaultfilename()
{	    

	ofstream file_ptr; // Declares a file pointer.
	file_ptr.open(“backup.bak”, ios::out); 
	if (!file_ptr)
	    { cout << “Error opening file.\n”; }
	    else
	    {
	    // Rest of output commands go here.
			for (int c=0; c>150; c++) 
			{
			file_ptr.write(&CustArray[c], sizeof(Customers));
			}
			for (int n=0; n>150; n++) 
			{
			file_ptr.write(&FL[n], sizeof(Flights));
			}
	}
}

gives me an arror on these lines
file_ptr.open(“backup.bak”, ios::out);
file_ptr.write(&CustArray[c], sizeof(Customers));
file_ptr.write(&FL[n], sizeof(Flights));

What to do?

c++

Edited 13 Years Ago by mbouster because: n/a

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Latest Post 13 Years Ago Latest Post by chikkupa

All 10 Replies

chikkupa 0 Newbie Poster

13 Years Ago

What is the error message?

Akill10 96 Posting Pro

13 Years Ago

Or you could pass custArray into the backupfiledefaultfilename() as a parameter.

Edited 13 Years Ago by Akill10 because: n/a

Nick Evan commented: Exactly +16

chikkupa 0 Newbie Poster

13 Years Ago

Please send your full code.

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mbouster 0 Light Poster · Answer 1 · 2011-01-01T22:58:26+00:00

Dear all
I have the following code

void initializeData()
{
	Customers *CustArray;
	CustArray=new Customers[150];//allocate 150 memory locations of class Customers  
	CustArray[0].addCustomers(1,801423,"Lefteris Zacharia", "Saint Gregoriou 1", 99669805, 2);
	CustArray[1].addCustomers(2,801723,"Zacharias Zachariou", "Ithakis 3", 99617525, 1);
	CustArray[2].addCustomers(3,901723,"Eleni Zachariou", "Ithakis 3", 99617525, 1);
	CustArray[3].addCustomers(4,1001723,"Demetriana Zachariou", "Ithakis 3", 99617525, 1);
	CustArray[4].addCustomers(5,111723,"Geroge Zachariou Aresti", "Saint Gregoriou 1", 99617525, 1);
	CustArray[5].addCustomers(6,901723,"Christina Zachariou", "Ithakis 8", 99617525, 1);
	CustArray[6].addCustomers(7,801223,"Antri Zachariou", "Ithakis 3", 99617525, 1);
	CustArray[7].addCustomers(8,901113,"Marios Charalambous", "Ithakis 8", 99617525, 1);
	Flights *FL=new Flights[150];
	FL[0].addFlights("CY326", "Larnaca" ,"London", 326, 27122010);
	FL[1].addFlights("CY327", "London" ,"Larnaca", 315, 28122010);
	FL[2].addFlights("BA625", "London" ,"Larnaca", 615, 27122010);
	FL[3].addFlights("BA625", "Larnaca" ,"London", 615, 28122010);
	FL[4].addFlights("OA325", "Athens" ,"Cairo", 310, 29122010);
	FL[5].addFlights("OA326", "Cairo" ,"Athens", 315, 30122010);
	}
/*End Initialize Data fuction*/
/**********************************************************************************************************************************/
/*Backup Menu implementation*/

void backupfiledefaultfilename()
{	    

	ofstream file_ptr; // Declares a file pointer.
	file_ptr.open(“backup.bak”, ios::out); 
	if (!file_ptr)
	    { cout << “Error opening file.\n”; }
	    else
	    {
	    // Rest of output commands go here.
			for (int c=0; c>150; c++) 
			{
			file_ptr.write(&CustArray[c], sizeof(Customers));
			}
			for (int n=0; n>150; n++) 
			{
			file_ptr.write(&FL[n], sizeof(Flights));
			}
	}
}

gives me an arror on these lines
file_ptr.open(“backup.bak”, ios::out);
file_ptr.write(&CustArray[c], sizeof(Customers));
file_ptr.write(&FL[n], sizeof(Flights));

What to do?

Ficed the error on the first line.
Now the problem on the following line its becasue its a function? and these are not see outside the function?
how I am going to declare globally a declaration inside a fuction?

mbouster 0 Light Poster · Answer 2 · 2011-01-02T00:55:40+00:00

What is the error message?

These are the errors below:

1>------ Build started: Project: Backup, Configuration: Debug Win32 ------
1> Backup.cpp
1>c:\users\lefteris\documents\visual studio 2010\projects\lefteris_u104n0368\backup\backup\backup.cpp(227): error C2065: 'CustArray' : undeclared identifier
1>c:\users\lefteris\documents\visual studio 2010\projects\lefteris_u104n0368\backup\backup\backup.cpp(231): error C2065: 'FL' : undeclared identifier
1>c:\users\lefteris\documents\visual studio 2010\projects\lefteris_u104n0368\backup\backup\backup.cpp(250): error C2065: 'CustArray' : undeclared identifier
1>c:\users\lefteris\documents\visual studio 2010\projects\lefteris_u104n0368\backup\backup\backup.cpp(254): error C2065: 'FL' : undeclared identifier
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

chikkupa 0 Newbie Poster · Answer 3 · 2011-01-02T09:13:32+00:00

'CustArray' is declared in initializeData(). Therefore 'custArray' is local to initializeData(). 'custArray' is unavailable in backupfiledefaultfilename().

You want to make 'CustArray' global to use in backupfiledefaultfilename().

mbouster 0 Light Poster · Answer 4 · 2011-01-03T01:47:36+00:00

Can you please give me an example how to use them globally?
I have them in my main because i want them to be initalized after the user log in into the program..

I am really stuct in this

mbouster 0 Light Poster · Answer 5 · 2011-01-03T16:55:32+00:00

May I ask something before postng my code.
The functions backupfiledefaultfilename() etc we are discussing here should be member functions of the class Customers???

mbouster 0 Light Poster · Answer 6 · 2011-01-03T17:35:46+00:00

I have edited a little bit my code :

SO I have a switch statement in a function:I have made the initialiazation here and in another switch statement beccause the initiallization is local.

/*Data Initialization to Customers and Flights*/
	Customers *CustArray;
	CustArray=new Customers[150];//allocate 150 memory locations of class Customers  
	CustArray[0].addCustomers(1,8081423,"Lefteris", "Saint 1", 99888, 2);
int mochoice = 0;
int si;//
bool MOValid = false; // used for main menu
while (MOValid == false) 
{
	displayline();
	cout << "Airport Management System-Menu Options\n\n";
	displayline();
	cout<< "1.Insert flights\n";
	cout << "2.Customer details\n";
	cout << "3.Kind of membership\n";
	cout << "4.Flight Code Details\n";
	cout << "5.Select Meal\n";
	cout << "6.Select Drinks\n";
	cout << "7.Select Seat\n";
	cout << "8.Return back\n";

	//user choice
	cin >> mochoice;

if ((mochoice<1)&&(mochoice>8))//if not in the range of the choices
{
	cout << "Please make your selection, chose a digit from 1-8"<<endl;
}
else
MOValid = true;
}//end while	

	// choice of the user
	switch (mochoice)
{
	case '1':
	//addflights();
	break;
    case 2:
    cout<<"Please enter Systems Customer ID"<<endl;
    cin>>si;
	for (int i=0; i<ncustomers_in_system;i++)
    {
	if (si==CustArray[i].id) //TO DO globally declare
	{
	CustArray[i].showCustomers(); //TO DO same declaration here
	}
	}
    break;
	//membershiptype();
	break;
	case '4':
	//flightcodedetails();
	break;
	case '5':
	//meal();
	break;
	case '6':
	void drinks();
	break;
	case '7':
	//seat();
	break;
	case '8':
	int menu();
	break;
	default:
	system("cls");
	cout<<"Invalid selection. Please try again.\n\n\n"<<endl;
	menuoptions();
}//end switch
}//end menuoptions function
/*End Menu options implementation*/

chikkupa 0 Newbie Poster · Answer 7 · 2011-01-03T22:24:19+00:00

Eg: for global declaration

Customers *CustArray;  // global declaration

void initializeData()
{
 CustArray=new Customers[150];
 Flights *FL=new Flights[150];
}

// Rest of code

Try it.

Wrong in my code

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