cfb12_check_leap_year.cpp

#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;
}