Check for power of 2 in Bit Manipulation in C++

 #include <iostream>

using namespace std;

bool isPowerOf2(int num) {

    if (!(num & (num-1))) { // if not equal to num & num-1

        return true;

    } else {

        return false;

    }

}

int main()

{

    cout << isPowerOf2(4) << endl;

    cout << isPowerOf2(16) << endl;

    cout << isPowerOf2(13) << endl;

    cout << isPowerOf2(7) << endl;

    return 0;

}