C :

#include <stdio.h>
void main()
{
	int year;
	scanf("%d",&year);
	if(year%100!=0&&year%4==0||year%400==0)
		printf("yes\n");
	else
		printf("no\n");
}

C++ :

#include <iostream>
#include <cstdio>
using namespace std;
int main()
{
    int a;
    cin>>a;
    //如果a不能被100整除且a能被4整除，a就是闰年
    //如果a能被400整除，a就是闰年。
    if( (a%100 != 0  && a%4 == 0) || (a%400 == 0) )
    {
        cout<<"yes"<<endl;
    }
    else
    {
        cout<<"no"<<endl;
    }    
    return 0;
}

Pascal :

var a:integer;
BEGIN
        read(a);
        if (a mod 400=0)  or (a mod 100>0) and (a mod 4=0)    then
        begin
                write('yes');
        end
        else
        begin
                write('no');
        end;
END.

Python :

# coding=utf-8
a=int(input())
if(a%400==0):
    print("yes")
else:
    if(a%4==0):
        if(a%100==0):
            print("no")
        else:
            print("yes")
    else:print("no")