All years which are perfectly divisible by 4 are leap years except for century years. #include <iostream> using namespace std; int main() { int year; cout << "Enter a year: "; cin >> year; if (year % 4 == 0) { if (year % 100 == 0) { if (year % 400 == 0) cout << year << " is a leap year."; else cout << year << " is not a leap year."; } else cout << year << " is a leap year."; } else cout << year << " is not a leap year."; return 0; }…