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Check username and password from file

this program reads one username and one password from a file. and then verifies them to be correct. also features a utility to change username and password, but requires the current password. Compiled with Dev-C++

Submitted By: cipherence

Actions:

Rating:

Views: 8,012

Language: C++

Last Modified: August 23, 2006

Instructions: create a file called username.txt and a file called password.txt . obviously put one username in the user file and one pass in the pass file. no blanks are accepted.

Snippet

// written by Cipherence
// compiled with Dev-C++
// use, re-write, claim as your own. whatever
// hope you learn, it lacks comments
#include<iostream>
#include<fstream>
#include<conio.h>
using namespace std;
void Auth();
void Members();
void Userchange();
void Passchange();
string inuser;
string inpass;
string user;
string pass;
int num = 0;
string com;
main()
{
system("cls");
cout<<"Welcome\n---------------------------\n\n";
while(num==0)
{
system("cls");
cout<<"Command: ";
cin>>com;
if(com=="login")
{
Auth();
}
else if(com=="change-pass")
{
Passchange();
}
else if(com=="change-user")
{
Userchange();
}
else if(com=="credits")
{
cout<<"written by Jason Parker"; // cuz it was
}
else if(com=="exit")
{
cout<<"written by Cipherence SoftWurx";
getch();
break;
}
else if(com==com)
{
cout<<"Unknown command\n";
}
}
}
void Auth()
{
ifstream Passfile("password.txt", ios::in);
Passfile>>inpass;
ifstream Userfile("username.txt", ios::in);
Userfile>>inuser;
system("cls");
cout<<"USERNAME: ";
cin>>user;
cout<<"PASSWORD: ";
cin>>pass;
Userfile.close();
Passfile.close();
if(user==inuser&&pass==inpass)
{
cout<<"\nHit enter to continue to members area";
getch();
Members();
}
else
{
cout<<"nope";
getch();
main();
}
}
void Userchange()
{
string tempass;
system("cls");
cout<<"enter current password: ";
cin>>tempass;
if(tempass==inpass)
{
cout<<"utility to change username stored in file\n";
cout<<"CHANGE USER TO: ";
cin>>user;
ofstream Userfile("username.txt", ios::out);
Userfile<<user;
Userfile.close();
cout<<"Username successfully changed";
getch();
main();
}
else
{
cout<<"Invalid Password";
getch();
main();
}
}
void Passchange()
{
string tempass;
system("cls");
cout<<"enter current password: ";
cin>>tempass;
if(tempass==inpass)
{
cout<<"utility to change password stored in file\n";
cout<<"CHANGE PASS TO: ";
cin>>user;
ofstream Passfile("password.txt", ios::out);
Passfile<<user;
Passfile.close();
cout<<"password successfully changed";
getch();
main();
}
else
{
cout<<"Invalid Password: ";
getch();
main();
}
}
void Members()
{
cout<<"nothing";// put members code here
// like a while(){} loop or somethin like that
// comment please
}

Copy & Paste

// written by Cipherence
// compiled with Dev-C++
// use, re-write, claim as your own. whatever
// hope you learn, it lacks comments
#include<iostream>
#include<fstream>
#include<conio.h>

using namespace std;

void Auth();
void Members();
void Userchange();
void Passchange();

string inuser;
string inpass;
string user;
string pass;
int num = 0;
string com;

main()
{
      system("cls");
      cout<<"Welcome\n---------------------------\n\n";
      while(num==0)
      {
      system("cls");
      cout<<"Command: ";
      cin>>com;
      if(com=="login")
      {
      Auth();
      }
      else if(com=="change-pass")
      {
           Passchange();
           }
      else if(com=="change-user")
      {
           Userchange();
           }
      else if(com=="credits")
      {
           cout<<"written by Jason Parker"; // cuz it was
           }
      else if(com=="exit")
      {
           cout<<"written by Cipherence SoftWurx";
           getch();
           break;
           }
      else if(com==com)
      {
           cout<<"Unknown command\n";
           }
      }
}
void Auth()
{
     ifstream Passfile("password.txt", ios::in);
     Passfile>>inpass;
     ifstream Userfile("username.txt", ios::in);
     Userfile>>inuser;
     system("cls");
     cout<<"USERNAME: ";
     cin>>user;
     cout<<"PASSWORD: ";
     cin>>pass;
     Userfile.close();
     Passfile.close();
     if(user==inuser&&pass==inpass)
     {
     cout<<"\nHit enter to continue to members area";
     getch();
     Members();
     }
     else
     {
         cout<<"nope";
         getch();
         main();
         }
}
void Userchange()
{
     string tempass;
     system("cls");
     cout<<"enter current password: ";
     cin>>tempass;
     if(tempass==inpass)
     {
     cout<<"utility to change username stored in file\n";
     cout<<"CHANGE USER TO: ";
     cin>>user;
     ofstream Userfile("username.txt", ios::out);
     Userfile<<user;
     Userfile.close();
     cout<<"Username successfully changed";
     getch();
     main();
}
else
{
    cout<<"Invalid Password";
    getch();
    main();
}
}
void Passchange()
{
     string tempass;
     system("cls");
     cout<<"enter current password: ";
     cin>>tempass;
     if(tempass==inpass)
     {
     cout<<"utility to change password stored in file\n";
     cout<<"CHANGE PASS TO: ";
     cin>>user;
     ofstream Passfile("password.txt", ios::out);
     Passfile<<user;
     Passfile.close();
     cout<<"password successfully changed";
     getch();
     main();
}
else
{
    cout<<"Invalid Password: ";
    getch();
    main();
}
}
void Members()
{
     cout<<"nothing";// put members code here
     // like a while(){} loop or somethin like that
     // comment please
}

Comments
Acetolyne 2007-12-08 21:53:27
Great tutorial shows how to input text from a file which is a spot people often get stuck at this will come in handy for many people i believe thanx for posting this tutorial
Re@p3rM4n 2008-05-07 18:38:09
how would you do this so that there exit multiple acceptable usernames and passwords?
ayya14 2008-08-11 21:32:51
how would you implement this with multiple usernames and passwords in a single file?