21: Write a program to check if a year is leap year or not. If a year is divisible by 4 then it is leap year but if the year is century year like 2000, 1900, 2100 then it must be divisible by 400.


// Write a program to check if a year is leap year or not.
// If a year is divisible by 4 then it is leap year but if the year is
// century year like 2000, 1900, 2100 then it must be divisible by 400.

#include <iostream>
using namespace std;

int main()
{

    int year;

    cout << "Enter an year: ";
    cin >> year;

    if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
    {
        cout << "This is a leap year \n";
    }
    else
        cout << "This is not a leap year \n";

    return 0;
}

Input 1:


Enter an year: 300

Output 1:


This is not a leap year

Input 2:


Enter an year: 400

Output 2:


This is a leap year
 

Input 3:


Enter an year: 2001

Output 3:


This is not a leap year

Input 4:


Enter an year: 2400

Output 4:


This is a leap year




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