Storing data

[ProgramMaster]

Alright im making a rgram to log intoa system but I need it to store many things in the same folder, noe how would I have it to where it would cahck the data induvidualy such as a set of username and passwords

#include <iostream>
#include <string>
#include <fstream>
using namespace std;

int main()
{

  cin >> username
  cin >> password

fstream inou;
string login;
inout.open(login);
?
inout.close()
}