C++ program to take a year as input and tells whether it's a leap year or not

Following program shows you how take a year as input and tells whether it's a leap year or not.

#include <iostream>

int main() {
	int input;
	std::cout << "Enter a year:";
	std::cin >> input;
	if (input % 4 == 0) {
		if (input % 100 == 0) {
			if (input % 400 == 0) {
				std::cout << input << " its a leap year";

			} else {
				std::cout << input << " its not a leap year";
			}

		} else {
			std::cout << input << " its a leap year";
		}
	} else {
		std::cout << input << " its not a leap year";
	}
}

Output:

Example1:

Enter a year: 2003
2003 its not a leap year 

Example2:

Enter a year: 1880
1880 its a leap year