Csharp/C Sharp/Language Basics/Operator bitwise

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A class that displays the binary representation of a value

/*
C# A Beginner"s Guide
By Schildt
Publisher: Osborne McGraw-Hill
ISBN: 0072133295
*/
/* 
   Project 5-3 
 
   A class that displays the binary representation of a value. 
*/ 
using System; 
 
class ShowBits { 
  public int numbits; 
 
  public ShowBits(int n) { 
    numbits = n; 
  } 
 
  public void show(ulong val) { 
    ulong mask = 1; 
 
    // left-shift a 1 into the proper position 
    mask <<= numbits-1; 
 
    int spacer = 0; 
    for(; mask != 0; mask >>= 1) { 
      if((val & mask) != 0) Console.Write("1"); 
      else Console.Write("0"); 
      spacer++; 
      if((spacer % 8) == 0) { 
        Console.Write(" "); 
        spacer = 0; 
      } 
    } 
    Console.WriteLine(); 
  } 
} 
 
// Demonstrate ShowBits. 
public class ShowBitsDemo { 
  public static void Main() { 
    ShowBits b = new ShowBits(8); 
    ShowBits i = new ShowBits(32); 
    ShowBits li = new ShowBits(64); 
 
    Console.WriteLine("123 in binary: "); 
    b.show(123); 
 
    Console.WriteLine("\n87987 in binary: "); 
    i.show(87987); 
 
    Console.WriteLine("\n237658768 in binary: "); 
    li.show(237658768); 
 
 
    // you can also show low-order bits of any integer 
    Console.WriteLine("\nLow order 8 bits of 87987 in binary: "); 
    b.show(87987);  
  } 
}


Bit and, or, xor, not operator

 
using System;
class LogOpsApp
{
    public static void display(byte left, byte right, byte ans, string op) {
        string Lstr = null;
        string Rstr = null;
        string Astr = null;
        Lstr = Convert.ToString(left, 2);
        if (0 != right)
            Rstr = Convert.ToString(right, 2);
        else
            Rstr = "--------";
        Astr = Convert.ToString(ans, 2);
   
        Console.WriteLine("\t{0,8}\n{1}\t{2,8}\n\t{3,8}\n",Lstr, op, Rstr, Astr);
    }
   
    static void Main(string[] args)
    {
        byte a, b, c, d, e, f, g;
        a = 255;
        b = 132;
        c = 85;
        byte OneOperand = 0;
   
        d = (byte)(a & b);
        display (a, b, d, "&");
        e = (byte)(d | c);
        display (d, c, e, "|");
        f = (byte)(e ^ a);
        display (e, a, f, "^");
        g = (byte)~f;
        display (f, OneOperand, g, "~");
    }
}


Bit move operator

 
using System;
class Operators {
    static void Main() {
        int a = 256, b = 128, c, d;
        c = a >> 1;
        d = b << 1;
        Console.WriteLine("{0}", c); //128
        Console.WriteLine("{0}", d); //256
    }
}


Bit operator

 
using System;
class Operators {
    static void Main() {
        int a = 10, b = 15, c = 20, d, e, h, i;
        bool f, g, j = (a == b), k;
        d = (a & b);
        e = (a | b);
        f = (j && (b == c));
        g = (j || (b == c));
        h = (a ^ b);
        i = ~b;
        k = !j;
        Console.WriteLine("{0}", d); //10
        Console.WriteLine("{0}", e); //15
        Console.WriteLine("{0}", f); //False
        Console.WriteLine("{0}", g); //False
        Console.WriteLine("{0}", h); //5
        Console.WriteLine("{0}", i); //-16
        Console.WriteLine("{0}", j); //False
        Console.WriteLine("{0}", k); //True
    }
}


Bit Operators: move

 

using System;
class MainClass
{
    static void Main(string[] args)
    {
        int i = 1;
        for (int j = 0; j < 8; j++)
        {
            Console.WriteLine(
                "{0} << {1} = {2}", i, j, i << j);
        }
    }
}


Bit Shift operator

 
using System;
class CompoundBitOpsApp
{
    static void Main(string[] args)
    {
        for (byte j = 0; j < 8; j++)
        {
            byte k = 1;
            Console.WriteLine(
                "1 <<= {0,3} ({1}) = {2,8} ({3,3})",
                Convert.ToString(j, 2), j,
                Convert.ToString((k <<= j), 2), k);
        }
    }
}


Bitwise operation

/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa
Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
namespace nsBitwise
{
    using System;
    public class Bitwise345
    {
        static public void Main ()
        {
            char ch = "a";
            char toggle = (char) 0x20;
            for (int x = 0; x < 4; ++x)
            {
                Console.WriteLine ("In iteration {0}, ch = {1}",
                                   x + 1, (char) ch);
                ch = (char) (ch ^ toggle);
            }
        }
    }
}


Bitwise Operators 2

/*
 * C# Programmers Pocket Consultant
 * Author: Gregory S. MacBeth
 * Email: gmacbeth@comporium.net
 * Create Date: June 27, 2003
 * Last Modified Date:
 */
using System;
namespace Client.Chapter_2___Operators_and_Excpressions
{
  public class BitwiseOperators
  {
    static void Main(string[] args)
    {
      long MyBit = 0x1;
      long MyBitResult = 0;
      MyBitResult = MyBit & 0x1;
      MyBitResult = MyBit | 0x2;
      MyBitResult = MyBit ^ 0x4;
    }
  }
}


Demonstrate the bitwise NOT

/*
C#: The Complete Reference 
by Herbert Schildt 
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Demonstrate the bitwise NOT. 
using System; 
 
public class NotDemo { 
  public static void Main() { 
    sbyte b = -34; 
    int t; 
 
    for(t=128; t > 0; t = t/2) { 
      if((b & t) != 0) Console.Write("1 ");  
      if((b & t) == 0) Console.Write("0 ");  
    } 
    Console.WriteLine(); 
 
    // reverse all bits 
    b = (sbyte) ~b; 
 
    for(t=128; t > 0; t = t/2) { 
      if((b & t) != 0) Console.Write("1 ");  
      if((b & t) == 0) Console.Write("0 ");  
    } 
  } 
}


Demonstrate the shift operators

/*
C#: The Complete Reference 
by Herbert Schildt 
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Demonstrate the shift << and >> operators. 
using System; 
 
public class ShiftDemo { 
  public static void Main() { 
    int val = 1; 
    int t; 
    int i; 
 
    for(i = 0; i < 8; i++) {  
      for(t=128; t > 0; t = t/2) { 
        if((val & t) != 0) Console.Write("1 ");  
        if((val & t) == 0) Console.Write("0 ");  
      } 
      Console.WriteLine(); 
      val = val << 1; // left shift 
    } 
    Console.WriteLine(); 
 
    val = 128; 
    for(i = 0; i < 8; i++) {  
      for(t=128; t > 0; t = t/2) { 
        if((val & t) != 0) Console.Write("1 ");  
        if((val & t) == 0) Console.Write("0 ");  
      } 
      Console.WriteLine(); 
      val = val >> 1; // right shift 
    } 
  } 
}


Display the bits within a byte

/*
C#: The Complete Reference 
by Herbert Schildt 
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Display the bits within a byte.  
using System; 
 
public class ShowBits { 
  public static void Main() { 
    int t; 
    byte val;  
  
    val = 123; 
    for(t=128; t > 0; t = t/2) { 
      if((val & t) != 0) Console.Write("1 ");  
      if((val & t) == 0) Console.Write("0 ");  
    } 
  } 
}


Shift Operators 2

/*
 * C# Programmers Pocket Consultant
 * Author: Gregory S. MacBeth
 * Email: gmacbeth@comporium.net
 * Create Date: June 27, 2003
 * Last Modified Date:
 */
using System;
namespace Client.Chapter_2___Operators_and_Excpressions
{
  public class ShiftOperators
  {
    static void Main(string[] args)
    {
      uint a = 0;
      uint b = 0;
      a = 8 << 3;
      b = 32 >> 4;
    }
  }
}


Show bits

/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa
Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
namespace nsBitwise
{
    using System;
    public class Bitwise123
    {
        static public void Main ()
        {
            ushort x = 15542;
            ushort y = 21845;
            Console.Write ("x = {0} = ", x);
            ShowBits (x);
            Console.Write ("\r\ny = {0} = ", y);
            ShowBits (y);
            ushort result = (ushort) (x & y);
            Console.Write ("\r\nx & y     = ");
            ShowBits (result);
            Console.WriteLine (" = " + result);
            Console.Write ("\r\nx = {0} = ", x);
            ShowBits (x);
            Console.Write ("\r\ny = {0} = ", y);
            ShowBits (y);
            result = (ushort) (x | y);
            Console.Write ("\r\nx | y     = ");
            ShowBits (result);
            Console.WriteLine (" = " + result);
            Console.Write ("\r\nx = {0} = ", x);
            ShowBits (x);
            Console.Write ("\r\ny = {0} = ", y);
            ShowBits (y);
            result = (ushort) (x ^ y);
            Console.Write ("\r\nx ^ y     = ");
            ShowBits (result);
            Console.WriteLine (" = " + result);
        }
        static void ShowBits (ushort x)
        {
            int size;
            unsafe
            {
                size = sizeof (short) * 8;
            }
            for (int i = size - 1; i >= 0; --i)
            {
                Console.Write ((x >> i) & 1);
                if ((i % 4) == 0)
                    Console.Write (" ");
            }
        }
    }
}


Use bitwise AND to determine if a number is odd

/*
C#: The Complete Reference 
by Herbert Schildt 
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
//  Use bitwise AND to determine if a number is odd. 
using System; 
 
public class IsOdd {  
  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."); 
 
  } 
}


Use bitwise AND to make a number even

/*
C#: The Complete Reference 
by Herbert Schildt 
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
//  Use bitwise AND to make a number even. 
using System; 
 
public class MakeEven {  
  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");  
    } 
  } 
}


Use bitwise OR to make a number odd

/*
C#: The Complete Reference 
by Herbert Schildt 
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
//  Use bitwise OR to make a number odd. 
using System; 
 
public class MakeOdd {  
  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");  
    } 
  } 
}


Use the shift operators to multiply and divide by 2

/*
C#: The Complete Reference 
by Herbert Schildt 
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Use the shift operators to multiply and divide by 2. 
using System; 
 
public class MultDiv {  
  public static void Main() { 
    int n; 
 
    n = 10; 
 
    Console.WriteLine("Value of n: " + n); 
 
    // multiply by 2 
    n = n << 1; 
    Console.WriteLine("Value of n after n = n * 2: " + n); 
 
    // multiply by 4 
    n = n << 2; 
    Console.WriteLine("Value of n after n = n * 4: " + n); 
 
    // divide by 2 
    n = n >> 1; 
    Console.WriteLine("Value of n after n = n / 2: " + n); 
 
    // divide by 4 
    n = n >> 2; 
    Console.WriteLine("Value of n after n = n / 4: " + n); 
    Console.WriteLine(); 
 
    // reset n 
    n = 10; 
    Console.WriteLine("Value of n: " + n); 
 
    // multiply by 2, 30 times 
    n = n << 30; // data is lost 
    Console.WriteLine("Value of n after left-shifting 30 places: " + n); 
 
  } 
}


Use XOR to encode and decode a message

/*
C#: The Complete Reference 
by Herbert Schildt 
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Use XOR to encode and decode a message. 
 
using System; 
 
public class Encode {  
  public static void Main() { 
    char ch1 = "H"; 
    char ch2 = "i"; 
    char ch3 = "!"; 
 
    int key = 88; 
 
    Console.WriteLine("Original message: " + 
                      ch1 + ch2 + ch3); 
 
    // encode the message 
    ch1 = (char) (ch1 ^ key); 
    ch2 = (char) (ch2 ^ key); 
    ch3 = (char) (ch3 ^ key); 
 
    Console.WriteLine("Encoded message: " +  
                      ch1 + ch2 + ch3); 
 
    // decode the message 
    ch1 = (char) (ch1 ^ key); 
    ch2 = (char) (ch2 ^ key); 
    ch3 = (char) (ch3 ^ key); 
    
    Console.WriteLine("Decoded message: " + 
                      ch1 + ch2 + ch3); 
  } 
}
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