Question

Keeping this code written as close to this as possible and only using these headers. How do I turn this in to a code that can read from 3 files of passwords then sort them into two files. One for valid passwords and the other for invalid passwords and then send a message to the user that says how many are valid and how many are invalid. Only using

std::ifstream fin;
fin.open("data.txt");
fin.close();

std::ofstream fout;
fout.open("data.txt");
fout.close();

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main()
{
    string password;
    size_t size = 0;
    int no_digits = 0;
    
    bool correct_password = true;
    
    do
    {
        correct_password = true;
        
        cout << "Enter password: ";
        cin >> password;
        
        size = password.length();
        
        // CHECK LENGTH
        if( size < 8 )
        {
            cout << "Password must contain 8 or more characters\n";
            correct_password = false;
        }
        
        // CHECK ALL ALPHANUMERIC
        for(size_t i = 0; i < size; i++)
        {
            if ( !isalnum(password[i]))
            {
                cout << "Password contains non alphanumeric character\n";
                correct_password = false;
            }
        }
        
        // CHECK NUMBER OF DIGITS
        for(size_t i = 0; i < size; i++)
        {
            if ( isdigit(password[i]))
            {
                no_digits++;
            }
        }
        if (no_digits < 2)
        {
            cout << "Password contains less than 2 digits\n";
            correct_password = false;
        }
        
        cout << "Password ";
        if( correct_password)
            cout << "is ";
        else
            cout << "is not ";
        cout << "acceptable\n";
        
    } while( correct_password == false);
    
    return 0;
}

Answer 1

/*
 *  C++ Program
 *  valid - Invalid password sorting
 */

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main()
{
  string password;
  size_t size = 0;
  int no_digits = 0;
  
  bool correct_password = true;

  ifstream fin;
  fin.open("pass.txt");
  
  ofstream fout1, fout2;
  fout1.open("valid.txt");
  fout2.open("inalid.txt");

  int countValid = 0, countInvalid = 0;
  
  while (!fin.eof())
  {
    correct_password = true;
    
    /*
    cout << "Enter password: ";
    cin >> password;
    */

    fin >> password;
    
    size = password.length();
    
    // CHECK LENGTH
    if( size < 8 )
    {
      //  cout << "Password must contain 8 or more characters\n";
      correct_password = false;
    }
    
    // CHECK ALL ALPHANUMERIC
    for(size_t i = 0; i < size; i++)
    {
      if (!isalnum(password[i]))
      {
        //  cout << "Password contains non alphanumeric character\n";
        correct_password = false;
      }
    }
    
    // CHECK NUMBER OF DIGITS
    for(size_t i = 0; i < size; i++)
    {
      if ( isdigit(password[i]))
      {
        no_digits++;
      }
    }
    if (no_digits < 2)
    {
      //  cout << "Password contains less than 2 digits\n";
      correct_password = false;
    }
    
    /*
    cout << "Password ";
    if(correct_password)
      cout << "is ";
    else
      cout << "is not ";
    cout << "acceptable\n";
    */

    if (correct_password)
    {
      fout1 << password << endl;
      countValid++;
    }
    else
    {
      fout2 << password << endl;
      countInvalid++;
    }

  }

  cout << "Total passwords: " << countValid + countInvalid << endl;
  cout << "Valid passwords: " << countValid << endl;
  cout << "Invalid passwords: " << countInvalid << endl;

  fin.close();
  fout1.close();
  fout2.close();
  
  return 0;
}

/*  Program ends here */

epl.it PowcerblueGratefulEmu x https://repl.it/@imtusharsharma/PowderblueGratefulEmulation gimtusharsharma/PowderblueGrateful Emulation share imtusharshar... my repls languages 88 talk notifications run new repl C No descoription O saved main.cpp https./PowderblueGralefull Emulalion. imtusharshanna.repl Files clang version 7.0.0-3-ubuntu0 . 10.04.1 (Lags/RELEASE 700/final) clangt+-7 -pthread -o main main.cpp main.c... Ctt Proeran valid Invalid password sorting inalid bxt Trat al valid passwords: 6 Valid passwords: 3 pass.txt nvalid pasmwords: 3 #include cCetnoam valid.txt #include <string> using namespace std; 16 int main() 13 string password; size t size - 0; int no digits 14 15 bool correct_password true; 19 19 ifstream fin; fin.open("pass.txt"); 2 ofstream fout1, fout2; fout1.open("valid . txt") ; 23 24 fout2.open"inalid.txt"); 25 int countvalid , countInval id e; 27 28 while (Ifin.eof ()) 20 correct password true; cout <"Enter password: "; 4 cin nasswn ENG 0457 AM Type here to search IN 23-05-2019

Pass file

epl.it PowcerblueGratefulEmu x https://repl.it/@imtusharsharma/PowderblueGrateful Emulation imt usharsharma/PowderblueGratefultmulation C No description share imtusharshar... my repls languages 88 talk notifications run new repl saved https./PowderblueGralefull Emulalion. imtusharshanna.repl pass.txt Files UneTWoa clang version 7.0.0-3-ubuntu0 . 10.04.1 (Lags/RELEASE 700/final) clangt+-7 -pthread -o main main.cpp main.cpp r34 cameleat smonkey inalid.txt 12bigbanana Trat al valid passwords: 6 4 mydollahssign Valid passwords: 3 השמ l id סמחאהה Tan : possix! 6 cat valid.txt ENG 0457 AM OType here to search IN 23-05-2019

Valid pass file

epl.it PowcerblueGratefulEmu x https://repl.it/@imtusharsharma/PowderblueGratefulEmulation gimtusharsharma/PowderblueGratefultmulation C No description share imtusharshar... my repls languages 88 talk notifications run new repl saved valid.txt https./PowderblueGralefull Emulalion. imtusharshanna.repl Files ThreeFour34 onkey 12bigbanana clang version 7.0.0-3-ubuntu0 . 10.04.1 (Lags/RELEASE 700/final) clangt+-7 -pthread -o main main.cpp main.cpp inalid txt Trat al valid passwords: 6 Valid passwords: 3 pass.Ixt nvalid passwords: 3 valicltxt ENG 0457 AM OType here to search IN 23-05-2019

Invalid pass file

epl.it PowcerblueGratefulEmu x https://repl.it/@imtusharsharma/PowderblueGratefulEmulation imtusharsharma/ Powder blueGrateful Emulation C No dascription share imtusharshar... my repls languages 88 talk notifications run new repl saved inalidbd https./PowderblueGralefull Emulalion. imtusharshanna.repl Files PreTWo clang version 7.0.0-3-ubuntu0 . 10.04.1 (Lags/RELEASE 700/final) clangt+-7 -pthread -o main main.cpp main.cpp ah$sign cat inalid.txt Trat al valid passwords: 6 Valid passwords: 3 passtxt nvalid passwords: 3 valid.txt ENG 0457 AM OType here to search IN 23-05-2019

Note: The unwanted lines are commented in your code, please drop comments fro queries.