2.18 逻辑运算符的优先级

#include <iostream> 
using namespace std;

int main()
{
    bool flag;
    int year;
    cout << "请输入一个年份：";
    cin >> year;
    if((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
        flag = true;
    else
        flag = false;

    if(flag)
        cout << year << "是闰年" << endl;
    else
        cout << year << "不是闰年" << endl;

    return 0; 
}