leetcode(80).342. Power of Four
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题意:
判断一个整数是否是4的次方。
初步分析:和判断2,3的次方都一样。这里用一下递归吧。
public class Solution { public boolean isPowerOfFour(int num) { if(num == 1) return true; if(num % 4 == 0 && num!=0) return isPowerOfFour(num/4); else return false; }}
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