C++程序题

#include <iostream>
using namespace std;
int main(){
    int year;
    bool isLeapYear;
    cout<<"Enter the year:"<<endl;
    cin>>year;
    while(year!=-1){
        isLeapYear = ((year%400==0)||(year%100!=0 && year%4==0 ));
        if(isLeapYear)
            cout<<year<<" is a leap year"<<endl;
        else
            cout<<year<<" is not a leap year"<<endl;
        cout<<"Enter the year:"<<endl;
        cin>>year;
    
    }
    return 0;
}