Swap two bits in an integer

The problem involves swapping two specific bits of a given integer. This operation is performed by manipulating the individual bits of the integer using bitwise operations. In this article, we'll explore the concept of swapping two bits in an integer using bitwise operations.

Problem Statement and Description

Given a positive integer n and two bit positions a and b, the goal is to swap the bits at positions a and b in the binary representation of the integer n. This means that the bit at position a will take the value of the bit at position b, and vice versa.

Example

Consider the following examples to understand the concept:

• For the number 35 (binary 00100011): Swapping the bits at positions 6 and 0 results in the binary number 01100010, which is 98 in decimal.

• For the number 16 (binary 10000): Swapping the bits at positions 1 and 4 results in the binary number 00010, which is 2 in decimal.

• For the number -15 (binary 11110001): Swapping the bits at positions 5 and 1 results in the binary number 11010011, which is -45 in decimal.

• For the number 10 (binary 1010): Swapping the bits at positions 1 and 3 does not result in any change, as both bits have the same value.

Idea to Solve the Problem

The idea to solve the "Swap two bits in an integer" problem involves the following steps:

1. Extract the bit values at positions a and b using bitwise AND operations and right shifts.
2. Check if the extracted bit values are different. If they are different, perform a bitwise XOR operation on the integer to swap the bits at positions a and b.

Standard Pseudocode

function swapBits(num, a, b):
    if a or b is negative:
        Print "Invalid bit position (a, b)"
        return
    b1 = 1 & (num >> a)
    b2 = 1 & (num >> b)
    result = num
    if b1 is not equal to b2:
        result = num XOR ((1 << a) OR (1 << b))
    Print "Number :", num
    Print "Swap bits : (a, b)"
    Print "Output :", result

Algorithm Explanation

1. Check if a or b is negative. If so, print an error message and return.
2. Extract the values of the bits at positions a and b using bitwise AND operations and right shifts.
3. Check if the extracted bit values are different (b1 != b2). If they are different, perform a bitwise XOR operation between the integer and a value obtained by performing bitwise OR operations on the original integer with the values 1 << a and 1 << b. This effectively swaps the bits at positions a and b.
4. Print the original number, the bit positions to be swapped, and the resulting number after swapping.

Code Solution

1) Swap two specific bits of a integer in java 2) Swap two specific bits of a integer in c++ 3) C program to swap two bits 4) Swap two specific bits of a integer in c# 5) Swap two bits of a integer in python 6) Swap bits in a given number in ruby 7) Swap two specific bits of a integer in swift 8) Swap two specific bits of a integer in kotlin 9) Swap two given bits of an integer in php 10) Swap two specific bits of a integer in node js 11) Swap two specific bits of a integer in typescript 12) Swap two specific bits of a integer in vb.net 13) Golang program to swap two bits of a byte 14) Swap two bits of integer at given position in scala

Time Complexity

The time complexity of the provided algorithm is O(1), as it involves a constant number of bitwise operations regardless of the value of the given number.