Program to check whether an year is a leap year or not

#include<iostream.h>
#include<conio.h>
void lyear(int a);
void main()
{
clrscr();
int a;
cout<<"enter a no.";
cin>>a;
lyear(a);
getch();
}
void lyear(int a)
 {
   cout<<"\n\n";
  if(a%100==0&&a%400==0||a%4==0)
    {
     cout<<a<<"is a leap year";
    }
  else
    {
     cout<<a<<"it is not a leap year";
    }
}