C++ primer ----------- 流状态的查询和控制

#include<iostream>#include<fstream>using namespace std;int main(){int val;while(cin >> val, !cin.eof()){   if(cin.bad())  throw runtime_error("IO stream corrupted.");  if(cin.fail())  {    cerr << "bad data, try again" <<endl;cin.sync();   // 加上这句才能达到效果，详解见链接。cin.clear();  continue;  }     }      cout << val <<endl;  return 0;}

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