isPowerOfFour.cpp

/*Given an integer (signed 32 bits), write a function to check whether it is a power of 4.  Example: Given num = 16, return true. Given num = 5, return false.  

Given num = 16, return true. Given num = 5, return false.*/







class Solution {
public:
    bool isPowerOfFour(int num) {
        return (num>0)&&((num&(num-1))==0)&&((num&0x55555555)==num);
    }
};