342. Power of Four
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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?
lass Solution {public: bool isPowerOfFour(int num) { int n = num; if(n<=0 || n==2 || n==3) return false; if(n==1 ||n==4) return true; while(n>4){ if(n%4) return false; n = n/ 4; if(n <4) return false; if(n==4) return true; } }};
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