Hamming distance in C

hamming.c

#include "time.h"
#include "stdio.h"
int hamming_distance(long int n, long int m);

int main()
{
	printf("%d    [should be   3]\n", hamming_distance(0x3c3e0e1a3a1e1e1e, 0x3c3e0e3e3e1e1e1e));
	printf("%d    [should be   6]\n", hamming_distance(55, 64));
	printf("%d   [should be  32]\n", hamming_distance(0x69684858535b7575, 0xe1e1e2a7bbaf6faf));
	printf("%d  [should be 119]\n", 55 ^ 64);

	return 1;
}

int hamming_distance(long int n, long int m)
{
	int i = 0;
	unsigned int count = 0;
	
	for(i=0;i<64;i++)
	{
		if( (n&1) != (m&1) )
		{
			count++;
		}

		n >>= 1;
		m >>= 1;
	}

	return count;
}