I am new to streams and files in C++.

I am having a problem in this code. When i run the program, and after entering the password, a message is displayed "error opening infile".

Why the program is not reading from the file or opening it?

#include<iostream>
#include<string>
#include<fstream>
#include<iomanip>
#include<conio.h>       
#include<ctype.h> 
using namespace std;


class quiz
{
      private:
              int i;
              char buffer[5][1000];
              char new_Q[1000];              
              ifstream infile;
              ofstream outfile;
              int arr1[5], arr2[5];
              int ans;    
      public:
             void insertnewQ()  //to get new data from user and insert in the array, and update back to file.
             {

                  i=0;
                  cout<<"Enter new question: ";

                  for (i=0; i < 5; i++)
                  {
                        
                      if (strcmp ((const char *)buffer[i], (const char *)"")==0)
                      {
                         cin.getline(buffer[i], 1000, '$');
                         cout<<"\nalso enter its correct option";
			             cin>>arr1[i];
                         break;     //get out of for loop
                      }
                  }
                  storeQ();         //update questions back to file.
             }
             void loadQ()               //load questions from file into array
             {    
                  infile.open("quiz.txt", ifstream::in);
                  if (!infile) cout <<"error opening infile";
                  i=0;
                  while (i < 5) strcpy (buffer[i++], (const char * )"");     //clear array of existing entries
                  i=0;     
                  while( !infile.eof() && i < 5) 
                  infile.getline(buffer[i++], 1000);
                  
                  cout<<"\nArray populated with questions loaded from file \n ";
                  infile.close();
             }
             void storeQ()              //update questions from array back to file.
             {

                  outfile.open ("quiz.txt", ios::trunc);
                  if (!outfile) cout <<"error opening outfile";
                  for ( i=0 ; i < 5; i ++) 
                  {
                        if (strcmp ((const char *) buffer[i], (const char *) "") != 0 ) //record not empty
                        {  
                           outfile<<buffer[i]<<"\n";  //write if record is not empty
                           //cout <<buffer[i]<<"yeh hai";
                        }
                  }      
                  outfile.close();
                  
             }
             void listQ()                     //to show questions stored in the array.
             {

                  for (i=0; i < 5; i++)
                  {
                      if (strcmp ((const char *)buffer[i], (const char *)"")!=0) 
                      cout<<buffer[i]<< "\n";
                      cin>>ans;
                      
                  }
                  for (i=0; i<5; i++)
		          arr2[i]=ans;
		          cal_marks();
             }
             void delQ(int item)
             {
                  strcpy(buffer[item], (const char *)"");
             }
             void delQ(bool val)
             {
                  if (val == true)  
                  {
                          for (i=0; i<5; i++)
                          strcpy(buffer[i], (const char *) 0);
                  } 
             }
             quiz()
             {
             i=0;
             while (i < 5) strcpy (buffer[i++], (const char * )"");     //initiaze with null 0
             if (strcmp ((const char*) buffer[4], (const char*) "") == 0)
             cout<<" "; 
             
             }
             void cal_marks()
	     {
		  int counter=0;

		  for (int i=0; i<5; i++)
		  if (arr1[i]==arr2[i])
		  counter++;
		  cout<<"\nYour marks are: "<<counter<<"/"<<"5";
		  }
            
                    
                    
};

                  
int main()
{
    int ch, choice, choice2, i=0, item;
    char *tempPassword = new char;
    quiz gk;
    top:
    cout<<"\n\"Welcome to the General Knowledge based Quiz\"\n\n";
    cout<<"\nEnter your choice: \n";
    cout<<"\n1. Administrator"
    <<"\n2. User\n\n";
    cin>>choice;
    
    if (choice==1)
    {
	
	cout << "enter your password: ";
	char ch = _getch();
	int j = 0;
	while (ch != '\r') 
	{
		if (ch == '\b')
		{
			if (j == 0)
				ch = _getch();
			else
			{
				cout <<"\b \b";
				j--;
				tempPassword--;
				ch = _getch();
			}
		}
		else
		{
			cout <<"*";
			*tempPassword = ch;
			ch = _getch();
			tempPassword++;
			j++;
		}
	}
	*tempPassword = '\0';
	for (; j>0; j--)
		tempPassword--;
	cout << endl;
  
  if (strcmp(tempPassword, "afifa")==0)
               {
                     
                 cout<<"\n\nWelcome to Administrator Mode\n";
                 cout<<"\n\tMenu\n";

                 gk.loadQ();        //initial loading from file.

                 back:             
                 
                 cout<<"\n1. Insert new question"
                 <<"\n2. List all questions"
                 <<"\n3. Delete a question"
                 <<"\n4. Delete all questions"
                 <<"\n5. Press 5 to exit\n";
                 cin>>choice2;

                 if (choice2==1)
                 gk.insertnewQ();   //insert a new questions
                 
                 else if (choice2==2)
                 gk.listQ();         //list all questions
                  
                 else if (choice2==3)
                 {
                 cout<<"\nWhich question do you want to delete: (e.g. 1 etc.)";
                 cin>>item;
                 gk.delQ(item); 
                 }       //function to delete one question
                 
                 else if (choice2 ==4)
                 gk.delQ(true);
                 
                 else if (choice2==5)
                 goto top;
                 }
                 goto back;
    }  
    else if(choice==2)

      {
	   cout<<"\nWelcome to the User Side ";
	   cout<<"\nAnswer the questions displayed below: ";
	   //gk.loadQ();
	   gk.listQ();
      }
      else
      {
	   cout<<"\nInvalid Choice entered";
	   cout<<"\nPress any key to continue... ";
      }
cin.get();
cin.get();
return 0;                   
}

Although the rest of the program may not be working properly, i need help in just opening the file.

Any help will be greatly appreciated.

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