# Category: Binary

## Bit Hacks – Part 4 (Playing with letters of English alphabet)

In this post we will discuss some of the bit hacks/tricks on letters of English alphabet.   Below tricks are covered in this post – Trick 1. Convert uppercase character to lowercase Trick 2. Convert lowercase character to uppercase Trick 3. Invert alphabet’s case Trick 4. Find letter’s position in alphabet     Trick 1. …

## Bit Hacks – Part 3 (Playing with rightmost set bit of a number)

In this post we will discuss few related problems that are related to unsetting the rightmost set bit of a number.   How to unset the rightmost set bit of a number? The expression (n & (n – 1)) will turn off the rightmost set bit of given number. (n – 1) will have all …

## Bit Hacks – Part 2 (Playing with k’th bit)

In this post we will discuss few related problems that operates on the k’th bit of a number.   Below problems are covered in this post – Problem 1. Turn off kth bit in a number Problem 2. Turn on kth bit in a number Problem 3. Check if kth bit is set for a …

## Bit Hacks – Part 1 (Basic)

With this post, we will start a series of amazing bit manipulation hacks that every programmer should know.   Below problems are covered in this post – Problem 1. Check if an given integer is even or odd Problem 2. Detect if two integers have opposite signs or not Problem 3. Add 1 to a …

## Efficiently implement power function | Recursive and Iterative

Given two integers x and n where n is non-negative, efficiently compute the value of power function pow(x, n).

## Find square of a number without using multiplication and division operator | 3 methods

Given an integer, find its square without using multiplication and division operator. Also, use of power function from any programming language library is not allowed.

## Generate power set of a given set

Given a set S, generate all subsets of it i.e., find power set of set S. A power set of any set S is the set of all subsets of S, including the empty set and S itself.   For example, if S is the set {x, y, z}, then the subsets of S are: …