Use the shift operators to multiply and divide by 2 : Bitwise Shift : Data Type C# Examples

    
using  System;  
  
class  Example  {    
    public  static  void  Main()  {  
        int  n;  
  
        n  =  10;  
  
        Console.WriteLine("Value  of  n:  "  +  n);  
  
        Console.WriteLine("multiply  by  2");
        n  =  n  <<  1;  
        Console.WriteLine("Value  of  n  after  n  =  n  *  2:  "  +  n);  
  
        Console.WriteLine("multiply  by  4");  
        n  =  n  <<  2;  
        Console.WriteLine("Value  of  n  after  n  =  n  *  4:  "  +  n);  
  
        Console.WriteLine("divide  by  2");
        n  =  n  >>  1;  
        Console.WriteLine("Value  of  n  after  n  =  n  /  2:  "  +  n);  
  
        Console.WriteLine("divide  by  4");
        n  =  n  >>  2;  
        Console.WriteLine("Value  of  n  after  n  =  n  /  4:  "  +  n);  
        Console.WriteLine();  
  
        Console.WriteLine("reset  n");
        n  =  10;  
        Console.WriteLine("Value  of  n:  "  +  n);  
  
        Console.WriteLine("multiply  by  2,  30  times");
        n  =  n  <<  30;  //  data  is  lost  
        Console.WriteLine("Value  of  n  after  left-shifting  30  places:  "  +  n);  
  
    }  
}