#include <stdio.h>

int ALU ( int n1, int n2);

main ()
{
   int  n1, n2, i;

   while (5 == 5) {
       printf ("\nTo close the program type 0: ");
       scanf  ("%d", &i);
       if     (i == 0) break;
       printf ("\nType the two numbers for the operation: ");
       scanf  ("%d %d", &n1, &n2);
       ULA    (n1, n2); 
   }
}

int ULA ( int n1, int n2)
{
    int bit, carry, tmp;
    carry = n1 & n2; //Get the carry bits
    bit = n1 ^ n2; //Get the answer bits
    while(carry) //Loop until we have rid ourselves of the carry bits
    {
	carry <<= 1; //shift carry bits one so they really will 'carry'
	tmp = bit ^ carry; //Exclusive OR the carry and answer to get the next answer
        carry &= bit; //Get rid of any carry bits that were used and gain any new ones
        bit = tmp;
	}
	printf ("%d", bit);
	scanf  ("%d", &bit);
	return bit;
}

#include <stdio.h>
#include <stdlib.h>

void showbits(unsigned long num)
{
	unsigned long i;
	
	for(i = 1 << ((sizeof(num) << 3) - 1); i; i >>= 1)
		putchar(num & i ? '1' : '0');
	
	return;
}

int main(int argc, char *argv[])
{
	if(argc == 2) showbits(atol(argv[1]));
	
	return 0;
}