Program to calculate sum of 1st and 4th digit through modulus operator

//// sum of 1st and 4th digit ////

#include "stdafx.h"

#include "stdio.h"

#include "conio.h"

#include "iostream"

using namespace std; 

int _tmain(int argc, _TCHAR* argv[])

{

       int a,b,c,d,sum;

       cout<<"enter 4-digit number";

       cin>>d;

       a=d/1000;

       d=d%1000;

       b=d/100;

       d=d%100;

       c=d/10;

       d=d%10;

       sum=a+d;

       cout<<"sum="<<sum;

       getch();

}