c++ program to check if a year is leap year or not

#include<iostream.h>
#include<conio.h>
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.";
getch();
}