#include<iostream>      
using namespace std;      
 int main(){      
     int a,i;
     for(i=1;i<=a;i++){
     while(cin>>a){
                   if(a%4==0&&a%100!=0||a%400==0){
                           cout<<"a leap year"<<endl;                        
                        }else if(a==0){
                        break;
                        }else
                         cout<<"a normal year"<<endl;   
                   }
            
            
             }
     system("pause");      
     return 0;      
 }   
      這是我的程式碼

輸進去卻OLE   不知道是為何

把a==0的判斷放到前面

..............................

if(a==0){
                        break;
                        }

else if(a%4==0&&a%100!=0||a%400==0){
                           cout<<"a leap year"<                        }

................................

像你原來那樣打當a=0時會因為a%400==0就正確而輸出"a leap year"

另外ststem("pause");也刪掉

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

謝謝這位好心的大大,

原來是我沒搞清楚處理順序,謝謝指點