c++if语句判断闰年

以下是用C++的if语句判断闰年的示例代码：

#include <iostream>
using namespace std;

int main() {
    int year;
    bool leap;

    cout << "请输入年份：";
    cin >> year;

    if (year % 4 == 0) {
        if (year % 100 == 0) {
            if (year % 400 == 0)
                leap = true;
            else
                leap = false;
        } else
            leap = true;
    } else
        leap = false;

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

    return 0;
}