Csharp/CSharp Tutorial/Operator/shift operator — различия между версиями

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Версия 15:31, 26 мая 2010

Shift Operators in action

using System;
class MainClass
{
  static void Main(string[] args)
  {
    uint a = 0;
    uint b = 0;
    a = 8 << 3;
    
    Console.WriteLine(a);
    
    b = 32 >> 4;
    
    Console.WriteLine(b);
  }
}
64
2

Shift Operators: shift left and right

using System;
class MainClass
{
   static void Main()
   {
      int a, b, x = 14;
      a = x << 3;      // Shift left
      b = x >> 3;      // Shift right
      Console.WriteLine("{0} << 3 = {1}", x, a);
      Console.WriteLine("{0} >> 3 = {1}", x, b);
   }
}
14 << 3 = 112
14 >> 3 = 1

The Shift Operators

  1. <<: Left shift
  2. >>: Right shift

The general forms for these operators are shown here:


value < num-bits 
value > num-bits
  1. A "left shift" shift all bits to the left and a zero bit to be brought in on the right.
  2. A "right shift" causes all bits to be shifted right one position.
  3. In the case of a right shift on an unsigned value, a zero is brought in on the left.
  4. In the case of a right shift on a signed value, the sign bit is preserved.