C++ Mini Project

Thursday, August 11, 2022

C++ Mini Project

August 11, 2022 Leave a Reply

 C++ Mini Project


  •  Login and Registration System
This is one of the simplest projects to start with to learn about file systems in C++. The project involves a user registration process by asking username and password. Upon successful registration, a user file is created with the credentials. If the user does not exist, upon login, an error will be shown. You will also learn how to use Visual Studio to create a simple project.

  • Source Code

#include <iostream>
#include <fstream> //because here we are going to use file handling
#include <cstring>
using namespace std;

//this below is for verifying are you create an account or not
//so here we use bool value that always returns true or false
//if you have account this means true and else false

//verify logged in or not

bool IsloggedIn()
{
    string username, password, un, pw; //last two are comparison string

    cout << "Enter username :";
    cin >> username;

    cout << "Enter password :";
    cin >> password;

    //for reading file that you have account or not
    //if stream for reading the file
    //read is variable here
    ifstream read("data\\" + username + ".txt"); //here data.txt where our data will save for us 
    //the file name is written in double cout in file handling
    getline(read, un); //for reading the user name is that user valid
    getline(read, pw); //reading the password correct or not

    //comparison

    if (un == username && pw == password)
    {
        return true;   //that the user is valid and can log in
    }
    else
    {
        return false;
    }
}

int main()
{
   // system("colour 3f"); for colour output in console
    int choice;

    cout << "1 : Register \n2 :Login\nYour choice :";
    cin >> choice;
    if (choice == 1)
    {
        string username, password;

        cout << "select a username :";
        cin >> username;
        cout << "select a password :";
        cin >> password;

        //

        ofstream file;
        //open file help of open function
        file.open("data\\" + username + ".txt");

  //rewrite in the file
        file<<"username :"<<username<<endl<<"password :"<<password; //the data is registered into our file
        file.close();

    //return here main because then again we going to logged in
    //then we go ahead and register another one so:
    main();
    }

//if user have already account and want to log in then
    else if(choice==2)
    {
        //create a variable status and assign into islogged in function 
        //and it proceed it from there
       bool status =IsloggedIn();

       if(!status) //if login goes wrong user name and password is incorrect
       {
          cout<<"Invalid user name password :"<<endl;
          system("PAUSE");

//This is a Windows-specific command, which tells the OS to run the pause
// program. This program waits to be terminated, and halts the execution of the parent C++ program. 
          return 0;
       }
       else //if success then return 1 or proceed further
       {
           cout<<"Successfully Logged in"<<endl;
           system("pause");
           return 1;
       }
    }
}

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