LeetCode[342] Power of Four
2016-07-13 15:30
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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?
Example:
Given num = 16, return true. Given num = 5, return false.
Follow up: Could you solve it without loops/recursion?
class Solution {
public:
bool isPowerOfFour(int num) {
if (num <= 0)
return false;
if (num == 1)
return true;
else if (num % 4)
return false;
else
return isPowerOfFour(num / 4);
}
};
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