Given a number we have to check that number is power of 2 or not.

So what is **power of 2**?

power of 2 is the number which is in the form of 2^n,where n is any number.

**Example:**

**input**:4
**output**:true
**input**:12
**output**:false

**Logic:**

`we have to calculate log2 of number,if it return integer value then it is power of 2.`

**Code-**

#include<bits/stdc++.h> using namespace std; int main() { int n; cout<<"enter a number"<<endl; cin>>n; if(ceil(log2(n))==floor(log2(n))) { cout<<"number is power of 2"<<endl; } else { cout<<"number is not power of 2"<<endl; } }

**Output:**

enter a number:32 number is power of 2

**Time complexity**:0(1)

**Space Complexity**:O(1)