gistfile1.txt

#include <iostream>

int main() {
  bool leap_year = false;
  int year;

  std::cout << "\nInput Year: ";
  std::cin >> year;

  while (year <= 999 || year >= 10000) {

    std::cout << "\nInvalid year, please use a four digit number: ";
    std::cin >> year;

  }

  bool yeardivby4 = !(year % 4);
  bool yeardivby100 = !(year % 100);
  bool yeardivby400 = !(year % 400);

  if (yeardivby4 && (!yeardivby100 || yeardivby100 && yeardivby400) ) {

    std::cout << "\nThis year is a leap year!\n";

  }
  else {
    std::cout << "\nThis is not a leap year :(\n";
  }
}