Thread: Can Not Open File

Code:

[/LEFT]
        
if(choose=='S'||choose=='D'||choose=='T')
	{
	outfile.open(filename,ios::out|ios::app);     
		   outfile.close();
			infile.open(filename,ios::in);
            if(!infile)
	cout<<"Error opening the file"<<endl;
            while(!infile.fail())
{
infile>>r_number>>r_name>>r_family>>r_city>>r_telephone>>type>>r_price>>r_time;
	if(type=='S')
		{
			account_s++;
                }
                if(type=='D')
                {
					account_d++;
                }
                if(type=='T')
                {
                    account_t++;
                }
            }
            single=single-account_s;
            doubler=doubler-account_d;
            triple=triple-account_t;
            infile.close();
          
if(n.type_room=='S')
{
if(single!=0)
{
cout<<"Total single bed room available is "<<single;
  cout<<endl;
                    cout<<"\nHow many single bed room you need?";
                    cout<<endl;
                    cin>>number;     
                    cout<<endl;
                }
                else
                {
					cout<<"\nSorry,No Room available.";
                    cout<<endl;
                }
            }
                      cin.get();
            cout<<"First Name : ";
            cin>>n.name;
            cout<<"Family Name : ";
            cin>>n.family;
            cout<<"City : ";
            cin>>n.city;
            cout<<"Telephone : ";
            cin>>n.telephone;
            cout<<"Charge :";
            cin>>n.cost_perday;
            cout<<"Days : ";
            cin>>n.time;
            
			int flag=0;
            for (int i=1;i<=number;i++)
			{
				cout<<"Room NO.: "<<endl;
                cin>>room;
                if(n.type_room=='S')
                {
					if(room<100 || room>199)
					{
						cout<<"You Should Choose The Number Between 100 And 199"<<endl;
                        cout<<endl;
                        i=i-1;
                        continue;
					}
					infile.open(filename,ios::in);
					if(!infile)
						cout<<"Error opening the file"<<endl;
					while(!infile.fail())
					{
						infile>>r_number>>r_name>>r_family>>r_city>>r_telephone>>type>>r_price>>r_time;
						if(room==r_number)
						{
							cout<<"You Should Choose Other Room.This is occupied."<<endl;
							cout<<endl;
							flag=1;
							i=i-1;
							break;
						}
						else
						{
							flag=0;
						}
					}
					infile.close();
					if(flag==1)
					{
						continue;
					}
				}

its not run well, cant open file properly, keep showing
"Error opening the file" some problem in the loop i cant find out please help

1) is 'filename' defined?
2) does the file exist?

after all i redefined fstream outfile,infile; in all the loop its finally work, but still dont know where should i really declare them, but

thx for remind