number of bits that are different between two numbers

diff.cpp

#include <iostream>
#include <string>
using namespace std;

int main(int argc, char const *argv[]) {
  int a,b;
  cin>>a>>b;
  int c = a^b;
  int count=0;
  while (c) {
    c = c&(c-1);
    count++;
  }
  cout<<count;
  return 0;
}