C# Bitwise Operators
In this chapter you will learn:
- How to use Bitwise Operators
- Example for bitwise operators
- Using bitwise AND
- Use bitwise AND to make a number even
- Use bitwise AND to determine if a number is odd.
- Use bitwise OR to make a number odd.
- How to use bitwise NOT operator
- How to use bitwise OR operator
Description
The bitwise operators act directly upon the bits of their operands. They are defined only for integer operands. They cannot be used on bool, float, or double.
| Operator | Result |
|---|---|
| & | Bitwise AND |
| | | Bitwise OR |
| ^ | Bitwise exclusive OR (XOR) |
| > | Shift right |
| < | Shift left |
| ~ | One's complement (unary NOT) |
All of the binary bitwise operators can be used in compound assignments.
x = x ^ 127;
x ^= 127;
True table,
| p | q | p & q | p | q | p ^ q | ~p |
|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 1 |
| 1 | 0 | 0 | 1 | 1 | 0 |
| 0 | 1 | 0 | 1 | 1 | 1 |
| 1 | 1 | 1 | 1 | 0 | 0 |
Example
The following code shows how to use the bitwise operators.
//ww w. ja va 2 s . c o m
using System;
class Program
{
static void Main(string[] args)
{
int i = 5;
int j = 6;
Console.WriteLine(i & j);
Console.WriteLine(i | j);
Console.WriteLine(i ^ j);
Console.WriteLine(i << 2);
Console.WriteLine(i >> 2);
}
}
The output:
AND Example
Using bitwise AND
class MainClass//ww w. ja v a2s. c o m
{
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);
}
}
The code above generates the following result.
Example 2
Use bitwise AND to make a number even
using System; /*w w w . j av a2 s.com*/
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");
}
}
}
The code above generates the following result.
Example 3
Use bitwise AND to determine if a number is odd.
using System; /*from www . ja v a 2 s .co m*/
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.");
}
}
The code above generates the following result.
Example 4
Use bitwise OR to make a number odd.
using System; /*from w w w . ja va2 s . co m*/
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 | 1); // num | 0000 0001
Console.WriteLine("num after turning on bit zero: "
+ num + "\n");
}
}
}
The code above generates the following result.
Example 5
How to use bitwise NOT operator
class MainClass/*www . ja v a2 s . co m*/
{
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;
System.Console.WriteLine("~byte1 = " + result);
}
}
The code above generates the following result.
Example 6
How to use bitwise OR operator
class MainClass//w w w . ja va2s .com
{
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);
}
}
The code above generates the following result.
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What you will learn in the next chapter: