C :

#include <stdio.h>
void main() {
    int year;
    scanf("%d", &year);
    if (year % 4 == 0) {
        if (year % 100 == 0) {
            if (year % 400 == 0) {
                printf("leap year\n");
            } else {
                printf("not leap year\n");
            }
        } else {
            printf("leap year\n");
        }
    } else {
        printf("not leap year\n");
    }
}

C++ :

#include<iostream>
using namespace std;
int main()
{
  int input;
  cin >> input;
  if((input%4 == 0 && input%100!=0) || input%400 == 0)
    cout << "leap year" << endl;
  else
    cout << "not leap year" << endl;
  return 0;
}

Pascal :

var
   year:integer;
begin
    readln(year);
    if (year mod 400=0)or(year mod 4=0)and(year mod 100<>0) then  writeln('leap year') else writeln('not leap year');
end.

Java :

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner s=new Scanner(System.in);
	int x=s.nextInt();
	if(x%100!=0&&x%4==0||x%400==0){
	System.out.println("leap year");
	System.out.println();
	}else
	System.out.println("not leap year");
System.out.println();
	}
}

Python :

n = input()
if n%400==0 or (n%4==0 and n%100):
  print "leap year"
else:
  print "not leap year"

C# :

using System;

namespace C言语
{
    class _2_3
    {
        public static bool isLeapYear(int n)
        {
            return n%4==0&&n%100!=0||n%400==0;
        }
        public static void Main()
        {
            int y;
            bool ans =true;
            y = int.Parse(Console.ReadLine());
      //      y=Convert.ToInt16(Console.ReadLine());
            ans=isLeapYear(y);
            if (ans)
            {
                Console.WriteLine("leap year");
            }
            else
            {
                Console.WriteLine("not leap year");
            }
            Console.ReadLine();
            return;
        }
    }
}