#include<iosteream>
using namespace std;
int main()
{
    int y;
    while(cin>>y)
    {
                 if((y%4==0)  &&  (y%100!=0) ) ||  (y%400==0)
                 {
                                               cout<<"閏年"<<endl;
                                               }
                                               else
                                               {
                                                   cout<<"平年"<<endl;
                                                   }
                                                   }
                                                   system("pause");
                                                    return 0;
                                                    }

為什麼執行到while時他跑不過去

到底是差在哪裡...

 有幫你改過 code ( 有排版比較容易閱讀 )

 再試試看吧