342. Power of Four（One-line）

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342. Power of Four

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.

Follow up: Could you solve it without loops/recursion?

One_line Code:

return(num&num-1) ==0 &&(num&1431655765);

342. Power of Four（One-line）

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原文地址：http://www.cnblogs.com/Alex0111/p/5403970.html