Wrong values during a Do-While loop C++ -


i'm having trouble during do-while loop on code. it's interface class makes validation values typed user. i'm using visual studio 2012. 

int interface::requestoption(){ int option; //el problema está aquí do{     cout<<"--------------------------------"<<endl;     cout<<"type option...";     cin>>option;     if(option<1 || option>8){         cout<<"invalid value, type again "<<endl;         sleep(2000);         system("cls");         menu();     } }while(!(option>0 && option<9)); return option;

}

if use method first time, returns value typed. when call again, while debug, notice value of option -893453, , also, doesn't allow me type number (cin >> option not working).

the method being called interact within next method:

void control::studentscontrol(){ int op; do{     system("cls");     interest->menu();     op = interest->requestoption();     lista<students>* students= null;     students = u->getstudents();     switch(op){      //eight options    //the 8th option return previous menu.  }while(op != 8);

}

call std::cin.clear() after each iteration before enter new value.


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