How to check the parity of a number
Overview
The parity of a number is the number of one bit in the binary representation of the number.
There are two types of parity.
- Even parity: The number contains an even number of one bit
- Odd parity: The number contains an odd number of one bit
Example 1
- Number: 11
- Binary Representation: 1011
This number has odd parity because there are three one-bits in the binary representation of 11.
Example 2
- Number: 10
- Binary Representation: 1010
This number has even parity because there are two one-bits in the binary representation of 10.
Code
Follow these steps to check the parity of a given number:
-
Create a Boolean flag called
parityFlagthat is initially set tofalse. -
Until the number is not equal to zero:
- Unset the rightmost bit of the number using
number & (number - 1). - Invert the
parityFlag
- Unset the rightmost bit of the number using
import java.util.Scanner;public class Main {private static String checkParity(int number){boolean parityFlag = false;while(number != 0){number &= (number - 1);parityFlag = !parityFlag;}return parityFlag ? "Odd Parity":"Even Parity";}public static void main(String[] args) {Scanner scanner = new Scanner(System.in);int n = scanner.nextInt();System.out.println("Parity of " + n + " - " + checkParity(n));}}
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