231-e-Power of Two
2015-07-06 18:44
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求一个数是否是2的n方。看这道题用例的提供者，貌似是个瓷器国人，而题目逻辑很明确感觉解法也应该没什么trick，感觉很平常的一道题不知为何leet会收录。该题我五分钟不到就写出来了，提交时遇到了0、1和负数的错误，稍作修改即可。这是刷题以来最快解答速度，但好像不怎么开心。。。
代码如下：
bool isPowerOfTwo(int n) {
bool result = true;
if(n <= 0)
result = false;
else if (n == 1)
result = true;
while (n > 1) {
if (n & 0x01) {
result = false;
break;
}
n = n >> 1;
}
return result;
}
代码如下：
bool isPowerOfTwo(int n) {
bool result = true;
if(n <= 0)
result = false;
else if (n == 1)
result = true;
while (n > 1) {
if (n & 0x01) {
result = false;
break;
}
n = n >> 1;
}
return result;
}
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