/*

Write an efficient C program to count the number of bits set in an
unsigned integer.
i/p     o/p
====    ===
0(00)    0
1(01)    1
2(10)    1
3(11)    2
.....  ...

*/

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

int main(int argc, char **argv)
{
  int x, i, j, num, factor;
  if(argc <2){
    printf ("Usage ./bitcount [numbers to process]\n");
    return 0;}
  for(i=1; i<argc ;i++) {
    num=atoi(argv[i]);
    x=num;
    j=0;
    while (x>0){
      factor= sqrt(x);
      x-=pow(2, factor);
      j++;
    }
    printf ("%d : %d\n", num, j);
  }
}