# Number of 1 Bits - InterviewBit Solution

**Problem**: __Number of 1 Bits__

## Problem Description:

Given a number, count the number of set bits.

### Example:

The 32-bit integer 11 has binary representation

`00000000000000000000000000001011 `

so the function should return 3

## Solution Approach:

To solve this problem we can keep dividing it by 2, whenever the remainder is 1, that means there is a set bit, so increment the count.

## Space & Time Complexity:

`Time Complexity: O(logN)`

- Since each time we are diving the number by 2.

`Space Complexity: O(1)`

## Solution:

Code in C++

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