Power of Two - The Coding Shala

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 In this post, we will learn how to check if the given number is Power of Two or not, and will implement its solution in Java.

Power of Two Problem

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 == 2^x.

Example 1:
Input: n = 1
Output: true
Explanation: 2^0 = 1

Example 2:
Input: n = 16
Output: true
Explanation: 2^4 = 16

Example 3:
Input: n = 3
Output: false

Power of Two Java Solution

Approach 1

Using Bit Manipulation.

Java Program: 

class Solution {
    public boolean isPowerOfTwo(int n) {
        if(n <= 0) return false;
        for(int i=0; i<32; i++) {
            if((n | (1<<i)) == (1 << i)) return true;
        }
        return false;
    }
}


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