Sum of two integers using bit wise operators

#include<stdio.h>
#include<conio.h>
void main()
{
int a,b,sum,carry;
clrscr();
printf("Enter the two number: ");
scanf("%d  %d",&a,&b);
sum=a^b;
carry=a&b;
while(carry!=0)
{
carry<<=1;
a=sum;
b=carry;
sum=a^b;
carry=a&b;
}
printf("\n Sum=  %d",sum);
getch();
}