1 #include 
     
       2 using namespace std; 3  4 int main() 5 { 6     int ival; 7     while(cin >> ival, !cin.eof()) 8     { 9         if(cin.bad())10             throw runtime_error("IO stream corrupted");11         if(cin.fail())12         {13             cerr << "bad data, try again";14             cin.clear(istream::failbit);15             cin.setstate(istream::eofbit);//设置结束位结束while死循环16             continue;17         }18         cout << ival << endl;19     }20     return 0;21 }
     

1 #include 
     
       2  3 using namespace std; 4  5 istream & fun(istream &in) 6 { 7     int ival; 8     while(in >> ival, !in.eof()) 9     {10         if(in.bad())// input stream is corrupted; bail out, 流是否已被破坏11         {12             throw runtime_error("ERROE:IO stream corrupted");13         }14         if(in.fail())// bad input15         {16             cerr << "bad date, try again:";17             in.clear();18             in.setstate(istream::eofbit);// 结束死循环,如果去掉该句，当输入字符时候就会出现死循环19             continue;20         }21         cout << ival << endl;22     }23     in.clear();// 将in中的所有状态值都设为有效状态24     return in;25 }26 27 int main()28 {29     cout << " Input some words ( ctrl + z to end ):\n"; 30     fun(cin);31     return 0;32 }