int count(long n) {
    int num = 0;
    if (n)

        do num++; while (n &= n - 1);

        while (n &= n - 1) num++;

    return num;
}
==

int parity(long n) {
    int num = 0;
    if (n)

        do num ^= 1; while (n &= n - 1);

        while (n &= n - 1) num ^= 1;

    return num;
}
==

==code(cpp)|
int isTwoPower(long n) {

    return ( n & (n - 1) ) == 0 ;

    return (n & (n-1) == 0);

}
==