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Simple Chat. Multiuser problem.

fercasti (19)
So I'm making a chat program... basically you open the .exe file and it asks for your nickname, then you can write and send a message which will be viewed by everyone online.

I have it working with just 1 user, my idea to make it work is:
Have two .exe wih the same code bar a few differences (IN the same projects folder).

I have the two projects in the same folder but the code creates TWO different example.txt. What I want is that from each code you can output the nickname to the SAME example.txt so I can print the 2 nicknames in 1 console. Not sure if I'm being clear enough. ANYWAY, other suggestions to make this program multi-user are appreciated, thanks for your time.

code 2:
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#include <iostream>
#include <fstream>
#include <Windows.h>

using namespace std;


class USUARIO
{

public:
    string nick[10];
};

class MENSAJE : public USUARIO
{

public:
    char mensaje[20];
    //bool todos = true;
    char destino;
};

class user: public MENSAJE
{
   public: string mp;
    char destino;
};
/*void login()
{
	USUARIO usuario;
	cout << "Enter your nickname: ";
	cin >> usuario.nick;
}
*/

void marco()
{
    system("cls");
    cout << (char)201;
    for (int i = 1; i <= 77; i++)
    {
        cout << (char)205;
        if (i == 15)
        {
            cout << (char)203;
        }
        else if (i == 77)
        {
            cout << (char)187;
        }
    }

    for (int k = 1; k <= 20; k++)
    {
        cout << (char)186;
        for (int i = 1; i <= 77; i++)
        {
            cout << " ";

            if (i == 15)
            {
                cout << (char)186;
            }
            else if (i == 77)
            {
                cout << (char)186;
            }
        }
    }

    cout << (char)200;
    for (int i = 1; i <= 77; i++)
    {
        cout << (char)205;

        if (i == 15)
        {
            cout << (char)202;
        }

        else if (i == 77)
        {
            cout << (char)188;
        }
    }
}


void gotoxy(int x, int y)
{
    HANDLE hcon;
    hcon = GetStdHandle(STD_OUTPUT_HANDLE);
    COORD dwPos;
    dwPos.X = x;
    dwPos.Y = y;
    SetConsoleCursorPosition(hcon, dwPos);
}

int main()
{

    ofstream myfile;
   myfile.open ("example.txt", ios::out | ios::app );


     if (myfile.is_open())
  {



  //else cout << "Unable to open file";



user usuario[4];


gotoxy(27, 9);
cout << "Enter your nickname: ";
cin >> usuario[1].nick[1];
myfile<<usuario[1].nick[1]<<endl;
//=i0
//do1-10



//i++
//w i<10 y n[i]<>13

//vl=i



marco();

gotoxy(1,1);
cout<<usuario[0].nick[0]<<endl;

gotoxy(1,2);
cout<<usuario[1].nick[1]<<endl;



int a=1;
int x1=23;
int y1=1;

      //  for (int i=0; i<=4; i++){
gotoxy(1,23);
cout << "Escribir: ";
cin>>usuario[0].mp;

gotoxy(23,1);
cout<<usuario[0].nick[0]<<": "<<usuario[0].mp<<endl;
//y1++;
//}





myfile.close();
gotoxy(1,23);
system("pause");
system("cls");

}
//return 0;
}


code 1:

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#include <iostream>
#include <fstream>
#include <Windows.h>

//if (myfile.is_open())
 // {
 //   main();

   // myfile.close();
 // }
using namespace std;


class USUARIO {

public:
string nick[10];
string mp;
};

class MENSAJE : public USUARIO {

public:
string mensaje;
// bool todos = true;
char destino;
};
class user: public MENSAJE
{
   public: string mp;
    char destino;
};



/*void login()
{
USUARIO usuario;
cout << "enter your nickname: ";
cin >> usuario.nick;
}
*/
void marco()
{
system("cls");
cout << (char)201;
for (int i = 1; i <= 77; i++)
{
cout << (char)205;
if (i == 15)
{
cout << (char)203;
}
else if (i == 77)
{
cout << (char)187;
}
}

for (int k = 1; k <= 20; k++)
{
cout << (char)186;
for (int i = 1; i <= 77; i++)
{
cout << " ";

if (i == 15)
{
cout << (char)186;
}
else if (i == 77)
{
cout << (char)186;
}
}
}

cout << (char)200;
for (int i = 1; i <= 77; i++)
{
cout << (char)205;

if (i == 15)
{
cout << (char)202;
}

else if (i == 77)
{
cout << (char)188;
}
}
}

void gotoxy(int x, int y){
HANDLE hcon;
hcon = GetStdHandle(STD_OUTPUT_HANDLE);
COORD dwPos;
dwPos.X = x;
dwPos.Y = y;
SetConsoleCursorPosition(hcon, dwPos);
}


int main()
{

    ofstream myfile;
   myfile.open ("example.txt", ios::out | ios::app );


     if (myfile.is_open())
  {



  //else cout << "Unable to open file";



user usuario[4];


gotoxy(27, 9);
cout << "Enter your nickname: ";
cin >> usuario[0].nick[0];
myfile<<usuario[0].nick[0]<<endl;
//=i0
//do1-10



//i++
//w i<10 y n[i]<>13

//vl=i



marco();

gotoxy(1,1);
cout<<usuario[0].nick[0]<<endl;

gotoxy(1,2);
cout<<usuario[1].nick[1]<<endl;


int a=1;
int x1=23;
int y1=1;

      //  for (int i=0; i<=4; i++){
gotoxy(1,23);
cout << "Escribir: ";
cin>>usuario[0].mp;

gotoxy(23,1);
cout<<usuario[0].nick[0]<<": "<<usuario[0].mp<<endl;
//y1++;
//}





myfile.close();
gotoxy(1,23);
system("pause");
system("cls");

}
//return 0;
}


and here's the full working code with ONE user only:

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#include <iostream>
#include <fstream>
#include <Windows.h>

using namespace std;


class USUARIO {

public:
char nick[10];
string mp;
};

class MENSAJE : public USUARIO {

public:
string mensaje;
// bool todos = true;
char destino;
};

/*void login()
{
USUARIO usuario;
cout << "Introduza su nickname: ";
cin >> usuario.nick;
}
*/
void marco()
{
system("cls");
cout << (char)201;
for (int i = 1; i <= 77; i++)
{
cout << (char)205;
if (i == 15)
{
cout << (char)203;
}
else if (i == 77)
{
cout << (char)187;
}
}

for (int k = 1; k <= 20; k++)
{
cout << (char)186;
for (int i = 1; i <= 77; i++)
{
cout << " ";

if (i == 15)
{
cout << (char)186;
}
else if (i == 77)
{
cout << (char)186;
}
}
}

cout << (char)200;
for (int i = 1; i <= 77; i++)
{
cout << (char)205;

if (i == 15)
{
cout << (char)202;
}

else if (i == 77)
{
cout << (char)188;
}
}
}

void gotoxy(int x, int y){
HANDLE hcon;
hcon = GetStdHandle(STD_OUTPUT_HANDLE);
COORD dwPos;
dwPos.X = x;
dwPos.Y = y;
SetConsoleCursorPosition(hcon, dwPos);
}

int main()
{
USUARIO usuario;

gotoxy(27, 9);
cout << "Introduza su nickname: ";

//=i0
//do1-10
cin >> usuario.nick;
//i++
//w i<10 y n[i]<>13

//vl=i



marco();

gotoxy(1,1);
cout<<usuario.nick<<endl;

int a=1;
int x1=23;
int y1=1;
do {
gotoxy(1,23);
cout << "Escribir: ";
cin>>usuario.mp;

gotoxy(23,y1);
cout<<usuario.nick<<": "<<usuario.mp<<endl;
y1++;}
while (a==1);



gotoxy(1,23);
system("pause");
system("cls");

return 0;
}
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