Conversion from Decimal to Binary

//Decimal to Binary
#include<iostream.h>
#include<conio.h>
void main()
{
 clrscr();
 long n,dn,r,base=1,bin=0;
 cout<<"Enter any decimal value\n";
 cin>>n;
 dn=n;
 while(n>0)
 {
  r=n%2;
  bin=bin+r*base;
  n=n/2;
  base=base*10;
 }
 cout<<"Enter Number is:"<<dn<<endl;
 cout<<"Binary value is:"<<bin<<endl;
 getch();
}