void Log_In()
{
    while(1)
    {
        int u,p;
        system("cls");
        Intro();

        if(p==1&&u==1)
            cout<<"\n\n\t\t\t\tWrong username and password!! ,Try again"<<endl;
        else if(u==1)
            cout<<"\n\n\t\t\t\tWrong username!! ,Try again"<<endl;
        else if(p==1)
        {
            cout<<"\n\n\t\t\t\tWrong password!! ,Try again"<<endl;
        }
        u=0,p=0;

        string user_name,password,user="",pass="";
        cout<<"\n\n\t\t\t\tUsername:";
        cin>>user_name;
        cout<<"\n\n\t\t\t\tPassword:";
        cin>>password;


        fstream new_file1,new_file2;
        new_file1.open("username.txt",ios::in);
        new_file2.open("password.txt",ios::in);

        char a,b;
        while(!new_file1.fail())
        {
            new_file1>>a;
            if (new_file1.eof())
            {
                break;
            }
            user+=a;
        }


        while(!new_file2.fail())
        {
            new_file2>>b;
            if (new_file2.eof())
            {
                break;
            }
            pass+=b;

        }



        if(user==user_name&&pass==password)
        {
            system("cls");
            cout<<"\n\n\n\n\t\t\t\tWelcome to Bus management system";
            for(int i=0; i<=7; i++)
            {
                break_t(125);
                cout<<".";
            }
            break;

        }
        else
        {
            if(user!=user_name)
                u=1;
            if(pass!=password)
                p=1;

        }

    }
}