新手：清除了异常标志位，为什么还是死循环

新手：清除了错误标志位，为什么还是死循环！

C/C++ code

#include <iostream>using namespace std;int main(){    cout<<"input a number:"<<endl;    int ival;    while(cin>>ival,!cin.eof()){        if(cin.bad()){            throw runtime_error("Can not fix");        }        if(cin.fail()){            cerr<<"Not the correct type needed"<<endl;            cin.clear(istream::failbit);                continue;        }    }    return 0;}            

  控制台一直输出Not the correct type needed!!为什么会是这样！！

[解决办法]
cin.clear(istream::failbit); 的意思是把标志位设为failbit

PS:C++ Primer第四版相关介绍有误,已多方证实
具体参见STL文档
[解决办法]

C/C++ code

#include <iostream>using namespace std;int main(){    cout<<"input a number:"<<endl;    int ival;    while(cin>>ival,!cin.eof()){        if(cin.bad()){            throw runtime_error("Can not fix");        }        if(cin.fail()){            cerr<<"Not the correct type needed"<<endl;            cin.clear();            //cin.clear(istream::failbit);            cin.sync();            continue;        }    }    return 0;} 

 

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