knr/2.9.c

int oldbitcount(unsigned x);
int newbitcount(unsigned x);

int main()
{
  
  return 0;
} 

/* bitcount:  count 1 bits in x */
int oldbitcount(unsigned x)
{
  int b;
  for (b = 0; x != 0; x >>= 1)
      if (x & 01)
           b++;
  return b;
}


/* bitcount:  count 1 bits in x */
int newbitcount(unsigned x)
{
  int b=0;
  for (int b=0; x!=0;)
    {
	 x &= (x-1);
      b++;
    } 
  return b; 
}