C++ Program to Check Leap.

#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;
}