how to override text file data in C++ -


i'm creating hotel management program in c++, i'm having trouble appending or fixing guest's completed info file.

the file saved text file. when user wants alter guest's info, tell program want alter, i.e. name. program clear name, , prompt user first name , surname of guest. program asks user if want info saved file. if user says yes, file saved.

in theory, file should changed, happens, whole new file created.

void alterinfo() {     system ("cls");      string alter;     char filename [100];     ifstream file_ptr;     cout << "\n\t\t\t\tsaved members:\n\n";     system ("dir/b *.");     cout << "\n\nplease type name of member you\n";     cout << "     wish open appears above or\n";     cout << "     type z (lower case) return main menu: ";     //cin.ignore();     gets (filename);      /*if (filename == "z")     {         system("pause");     }*/      if (filename[0]  != 'z')     {         char saveyn;         //cout<< "\nplease enter 6 digit registration access code: ";         //cin>>rac;          //if (rac == (file_ptr, membershipnumber))         //{             file_ptr.open(filename,ios::in);              // char in_char;             while(!file_ptr)             {                 cout << "member not exist\n";                 gets (filename);                 file_ptr.open(filename,ios::in);             }             getline(file_ptr, name);             getline(file_ptr, surname);             file_ptr >> address1;             getline(file_ptr, address2); // duplicate required eliminate             getline(file_ptr, address2); // empty field bug when using string after integer.             getline(file_ptr, address3);             getline(file_ptr, address4);             getline(file_ptr, postcode);             getline(file_ptr, telday);             getline(file_ptr, televe);             //file_ptr >> telday;             //file_ptr >> televe;             file_ptr >> indate>>                 inmonth>>                 inyear>>                 outdate>>                 outmonth>>                 outyear>>                 roomnumber>>                 membershipnumber;             getline(file_ptr, membershiptype); // duplicate required eliminate             getline(file_ptr, membershiptype); // empty field bug when using string after integer.             getline(file_ptr, membernotes);             guestform();             greentext();             whitetext();             file_ptr.close();             system("pause");              cout<< "\n\nwhat want alter (ex. name, address, etc): ";             getline(cin, alter);              if (alter == "name")             {                 ofstream myfile;                 resetguestname();                  guestform();                 cout << "\tplease enter guest's first name: ";                 cin >> ws;                 getline (cin, name);                 guestform();                 cout << "\tplease enter guest's surname: ";                 cin >> surname;                  guestform();                 cout << "\tsave these details file? <y/n> ";                  //confirmation before saving file                 cin >> saveyn;                 if (saveyn == 'y' || saveyn == 'y')                 {                     string savefilename;                     stringstream out;                     out << name << " " << surname;                     savefilename = out.str();                     ofstream myfile;                               //save file structure                     myfile.open (savefilename.c_str(), ios::out);                     myfile << name << "\n";                     myfile << surname << "\n";                     myfile << address1 << "\n";                     myfile << address2 << "\n";                     myfile << address3 << "\n";                     myfile << address4 << "\n";                     myfile << postcode << "\n";                     myfile << telday << "\n";                     myfile << televe << "\n";                     myfile << indate << "\n";                     myfile << inmonth << "\n";                     myfile << inyear << "\n";                     myfile << outdate << "\n";                     myfile << outmonth << "\n";                     myfile << outyear << "\n";                     myfile << membershipnumber << "\n";                     myfile << membershiptype << "\n";                     myfile << membernotes << "\n";                     //std::remove( myfile);                     myfile.close();                     guestform();                     greentext();                     cout << "\tdetails have been saved\n\n\t";                     whitetext();                     system ("pause");                 }             }         //}     } }

i tried calling savefile function, gave same results. know it's creating new file of same data, except (in case) guest's name.


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