Строковый массив и цикл for

#include <iostream>
using namespace std;

main()
{
      const int name = 5;
      const int mails = 5;
      const int passes = 5;
      string z;
      int p = 1;
      string pass[passes] = {"123", "1234", "12345", "123456", "1234567"};
      string user[name] = {"Mark", "Tom", "Scott", "Travis", "Sam"};
      string mail[mails] = {"mark@gmail.com", "tom@yahoo.com", "scott@hotmail.com", "travis@apple.com", "sam@gmail.com"};
    // string currentuser;
    cout << "There are 5 usernames in our database, enter a valid name for getting a password:" << endl;
    for (int i=0; i<name; ++i)
    {
       // cout << "attempt number " << i << endl;
        cout << "Pass for user "; cout << user[0]  << endl;
        getline(cin, z);
        if (z == pass[0]) 
        {
            cout << mail[0] << endl;
            user[0] = p;
            mail[0] = p;
            pass[0] = p;            
        } 
    } 
    system("pause");
}

#include <iostream>
using namespace std;

main()
{
      const int name = 5, mails = 5, passes = 5;
      string z;
      int p = 1, b = 0;
      string pass[passes] = {"123", "1234", "12345", "123456", "1234567"};
      string user[name] = {"Mark", "Tom", "Scott", "Travis", "Sam"};
      string mail[mails] = {"mark@gmail.com", "tom@yahoo.com", "scott@hotmail.com", "travis@apple.com", "sam@gmail.com"};
      cout << "There are 5 usernames in our database, enter a valid name for getting a password:" << endl;
      for (int i = 0, j = 0; i < name && j!=3; ++i)
      {
            cout << "Password for user "; cout << user[i]  << endl;
            std::string z;
            getline(cin, z);
            if (z == pass[i]) 
            {
                  cout << "Entered password is correctly, here's his e-mail: " << mail[i] << endl;         
            } 
            else
            {
                  j++;
                  i--;
                  cout << "Invalid login, please try again " << endl;
            }
      } 
      system("pause");
}