Csharp/CSharp Tutorial/Data Type/Bitwise AND

bitwise AND

<source lang="csharp">class MainClass {

 public static void Main()
 {
   byte byte1 = 0x9a;  // binary 10011010, decimal 154
   byte byte2 = 0xdb;  // binary 11011011, decimal 219
   byte result;
   System.Console.WriteLine("byte1 = " + byte1);
   System.Console.WriteLine("byte2 = " + byte2);
   
   result = (byte) (byte1 & byte2);
   System.Console.WriteLine("byte1 & byte2 = " + result);
 }

}</source>

byte1 = 154
byte2 = 219
byte1 & byte2 = 154

Use bitwise AND to determine if a number is odd.

<source lang="csharp">using System;

class Example {

 public static void Main() { 
   ushort num;  

   num = 10; 

   if((num & 1) == 1) 
     Console.WriteLine("This won"t display."); 

   num = 11; 

   if((num & 1) == 1) 
     Console.WriteLine(num + " is odd."); 

 } 

}</source>

11 is odd.

Use bitwise AND to make a number even

<source lang="csharp">using System;

class Example {

 public static void Main() { 
   ushort num;  
   ushort i;     

   for(i = 1; i <= 10; i++) { 
     num = i; 

     Console.WriteLine("num: " + num); 

     num = (ushort) (num & 0xFFFE); // num & 1111 1110 

     Console.WriteLine("num after turning off bit zero: " 
                       +  num + "\n");  
   } 
 } 

}</source>

num: 1
num after turning off bit zero: 0
num: 2
num after turning off bit zero: 2
num: 3
num after turning off bit zero: 2
num: 4
num after turning off bit zero: 4
num: 5
num after turning off bit zero: 4
num: 6
num after turning off bit zero: 6
num: 7
num after turning off bit zero: 6
num: 8
num after turning off bit zero: 8
num: 9
num after turning off bit zero: 8
num: 10
num after turning off bit zero: 10