Write a function that determines the number of bits set to 1 in the binary representation of an integer.

Question

Write a program to reverse the bits of an unsigned integer ??

Answer 1

Check if you are looking for bitcount in the following way...

#include <stdio.h>

int bitcount(int n) 
{
  int counter = 0;
  while(n) {
    counter ++;
    n &= (n - 1);
  }
  return counter;
}

main()
{
  int i;

  for(i=0;i<20;i++)
    printf("0x%x -- %d\n", i, bitcount(i));
}