Demonstrate bitwise left shift : shift « Data Types « C++ Tutorial

1. C++ Tutorial
2. Data Types
3. shift

#include <iostream>
using std::cout;
using std::cin;
using std::endl;

#include <iomanip>
using std::setw;

void displayBits( unsigned ); // prototype

int main()
{
   unsigned number1 = 960;

   cout << "The result of left shifting\n";
   displayBits( number1 );
   cout << "8 bit positions using the left-shift operator is\n";
   displayBits( number1 << 8 );

   return 0;
}
//Quote from
//C++ How to Program (5th Edition) (How to Program) (Paperback)
//by Harvey & Paul) Deitel & Associates

//Publisher: Prentice Hall; 5 edition (January 5, 2005)
//Language: English
//ISBN-10: 0131857576
//ISBN-13: 978-0131857575
void displayBits( unsigned value ) {
   const int SHIFT = 8 * sizeof( unsigned ) - 1;
   const unsigned MASK = 1 << SHIFT;

   cout << setw( 10 ) << value << " = ";

   for ( unsigned i = 1; i <= SHIFT + 1; i++ ) 
   {
      cout << ( value & MASK ? '1' : '0' );
      value <<= 1;

      if ( i  8 == 0 )
         cout << ' ';
   }

   cout << endl;
}

The result of left shifting
       960 = 00000000 00000000 00000011 11000000
8 bit positions using the left-shift operator is
    245760 = 00000000 00000011 11000000 00000000