program wont output line to file

Seraphimsan (954)
Hey it's me again,

Everything executes flawlessly save for outputting new users to a .dat file
It runs fine all the way through executing the "cout << "New User added" line but doesnt write any data to a file

I've checked permissions on the file and all should be well....also the file is in the same folder as the source code.


Here is the code
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#include "users.h" //user class
#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <fstream>
#include <strstream>
using namespace std;
//================Global Variables==========//
user current_user;
user new_user;
fstream users;


//================Erike menu===============//
int menu(void)
{
        system("PAUSE");
        return(0);
}
//===============return user===============//
int return_user(void)
{
    cout << "Welcome ";
    cout << current_user.fname;
    menu();
}
//==============New User===================//
int new_users(void)
{
    users.open("users.dat", ios::out | ios::ate);
    if (users.is_open())
    {
                                                                     //====================================== //
    users << "new_user: ";                       //               This is the code that is not executing         //
    users << current_user.fname;          //                                                                                          //
    users << "\n ";                                       //                                                                                          //
                                                                    //====================================== //
    cout << "New User added \n";
    menu();
} else cout << "files error";
  users.close();
}
//==============Welcome screen=============//
int welcome(void)
{

   string line;
   users.open("users.dat",ios::in);
 //open users.ini for background check
    
   cout << "Hiya! My name is Erika, who are you?";
   cin >> current_user.fname;
   if (users.is_open())
   {
      
      for (int J = 1; J <= 32;)
      {
          getline(users, line, ' ');
          if(line == current_user.fname)
              {
                                    return_user();
                                    } else J = (J + 1);
          if(J == 32)
               {
               users.close();
               new_users();
      }
} 
   
}else cout << "file error";
}
//==============Main=====================//
int main(int nNumberofArgs, char* szArs[])
{
    welcome();
        system("PAUSE");
    return 0;
}



I just want it to output those three lines to the users.dat file

As a note, I'd like to add that I've tried the same code with a .ini, and .txt
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