编写C++程序代码，需用到或者符号

Question

判断某年是否为闰年。
闰年要满足的条件之一：
（1）它能被4整除且不能被100整除
（2）能被400整除

Answer 1

#include <iostream>

bool is_leap_year(int year) {
  return (year % 4 == 0 && year % 100 != 0) || year % 400 == 0;
}

int main() {
  int year;
  std::cout << "Input a year: ";
  std::cin >> year;
  std::cout << year << (is_leap_year(year) ? " is " : " is not ")
            << "a leap year.\n";
  return 0;
}