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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?
public class Solution { public boolean isPowerOfFour(int num) { if(num<=0){ return false; } if(num==1){ return true; } while(num%4==0){ num=num/4; } return num==1; } }
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原文地址:http://www.cnblogs.com/incrediblechangshuo/p/5683303.html