int i;        int Temp ;        int tell;         ifstream fille ("C:\input.txt") ; /*it's not important just to read some           value and assign it with another value and use it in the loop           */         fille >> i ; // here read this value from the file         Temp = i ; // assign the value with another          for(i=Temp;i<20;){         /* here the user enters his data */         cout<< i;         cout << "Enter UserName" ;         cin >> Register[i].User_NameDOC ;             cout  << "Enter Password" ;             cin >> Register[i].PasswordDOC ;             cout  << "Enter Email" ;             cin >> Register[i].EmailDOC ;             break ;     } 

1. from here to store the previous user’s data in the file which called “file.txt” and use another file which called “tellp.txt” to save the last value of File_data.tellp(); then make the next register begin from this point (File_data.tellp()) as the normal , at the first i didn’t use seekp() cuz i thought that every time user enters data it will be stored but i found that every time user enters data the new data is replaced with the last data ex: if user[0] enter username , passowrd and email and user[1] enter username , password , email the data of user[1] will replace with data of user[0] so i have used seekp() and tellp() but also i found that the data of user[0] it becomes only spaces in the same line the data of user[1] ex: user[0] = hi Guys and user [1] = hello again the file of data which is file.txt ( hello again) this spaces for user[0]

          ofstream File_data ;       //declare outputfile to sotre the data of users          string outPath = "C:\file.txt" ; // so on..           ifstream tellpp ("C:\tellp.txt") ; /* here to read the last value of File_data.tellp() and put it in File_data.seekp() */                tellpp>> tell ;  

   // here to read this value and tell = File_data.tellp()

                     cout << tell ;             File_data.open(outPath.c_str());             if(File_data.fail()){             cerr << "it's failed" ;             }                 File_data.seekp(tell) ; /* here to assign tell value to                   seekp() to make user's data store at the end of the             previous user's data but the last user his data becomes            spaces                  */              File_data << Register[i].User_NameDOC             <<  Register[i].PasswordDOC             << Register[i].EmailDOC  << endl ;               cout << File_data.tellp() ;                 tell = File_data.tellp(); /*** here to assign **tell**                  to **File_data.tellp()**                  ***/              ofstream tellp;          /*here to declare the file which contains File_data.tellp()            (tell) */             string outPaaath = "C:\tellp.txt" ;            tellp.open(outPaaath.c_str());               tellp << tell; // here saves tell into              **tellp.txt                File_data.close() ;     /*         from here this code just to store the i value which in the         for loop to use it again ex: if i= 0 the next register it will be         equal (**1**)so on ..      */                fstream file;             string outPaath = "C:\input.txt" ;            file.open(outPaath.c_str(),                    ios::out|ios::in) ;                 ++i ;               file << i ;               file >> i ;               file.close();               tellp.close(); 

note: every thing is okey in the code and value of tellp() changes every time i run the code also (i) value in the for loop changes too but i wonder why users’s data is raplaced with spaces or the new data of new user