#include <iostream>

using namespace std;

#define isPowerOf2(X) !(X&(X-1))

int numberOf1(int x) {

int count = 0;

if (x < 0) {

count++;

x = -x;

}

while (x) {

x = x & (x-1);

count++;

}

return count;

}

int dif1OfTwoNumberInBinary(int m, int n) {

return numberOf1(m^n);

}

int main (char *argv[], int argc) {

cout << numberOf1(-9) << endl;

cout << isPowerOf2(8) << endl;

cout << dif1OfTwoNumberInBinary(10, 13) << endl;

return 0;

}