Problem Statement

Given an integer n, return true if it is a power of two. Otherwise, return false.

An integer n is a power of two, if there exists an integer x such that n == 2x.

 

Example 1:

Input: n = 1
Output: true
Explanation: 20 = 1

Example 2:

Input: n = 16
Output: true
Explanation: 24 = 16

Example 3:

Input: n = 3
Output: false

 

Constraints:

  • -231 <= n <= 231 - 1

Solution Program

[C++]


class Solution {
public:
    bool isPowerOfTwo(int n) {
        /*   for(int i=0;i<=30;i++)
        {
            int ans= pow(2,i);
            if(ans==n){
                return true;
            }
        }
        return false;*/
       
        if(n<1){
            return false;
           
        }
        while(n%2==0){
            n=n/2;
        }
        return n==1;
    }
};


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