The ultimate guide to bit manipulation for coding interviews. Developed by FAANG engineers, practice with real-world interview questions, and get interview-ready in just a few hours.

This course teaches bit manipulation, a powerful technique to enhance algorithmic and problem-solving skills. It is a critical topic for those preparing for coding interviews for top tech companies, startups and industry leaders. Competitive programmers can take full advantage of this course by running most of the bit-related problems in O(1) complexity.

The course will begin by educating you about the number system and its representation, decimal and binary, followed by the six bitwise operators: AND, OR, NOT, XOR, and bit-shifting (left, right).

You will receive ample practical experience working through practice problems to improve your comprehension.

Upon completing this course, you will be able to solve problems with greater efficiency and speed.

Grokking Bit Manipulation for Coding Interviews

# Introduction

In this question, we take input and find its bit length.

# Problem Statement

Given an input find its bit length.

```
Input: 8

Output: 4 (1000)
```

```
Input: 2

Output: 2 (10)
```

```
Input: 7

Output: 3 (111)
```

# Algorithm

We already discussed the formula of the left shift operator.

> a << b = ( a * $2^{b}$ )


Steps:

* Initialize a variable `bitsCounter` with value `0`.
* Now, left-shift `bitsCounter` until its values is less or equals to given number.
    *  if true, increament the `bitsCounter`. on each iteration.
    *  else, return `bitsCounter`.


# Solution

In this lesson, we make use of the Left Shift operator to find the bit length of a number.

Getting Started

Number Systems, Bitwise, and Binary

Bitwise AND

Bitwise OR

Bitwise NOT

Bitwise XOR

Bit Shifting - Left, Right

Bitwise LeftShift Problems

Bitwise RightShift Problems

Final Thoughts

Find Bit Length of a Number

Introduction

Problem Statement

Algorithm