fig16_11.cpp

来自「经典vc教程的例子程序」· C++ 代码 · 共 42 行

// Fig. 16.11: fig16_11.cpp
// Using the bitwise shift operators 
#include <iostream.h>
#include <iomanip.h>

void displayBits( unsigned );

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 );
   cout << "\nThe result of right shifting\n";
   displayBits( number1 );
   cout << "8 bit positions using the right "
        << "shift operator is\n";
   displayBits( number1 >> 8 );
   return 0;
}

void displayBits( unsigned value )
{
   unsigned c, displayMask = 1 << 15;

   cout << setw( 7 ) << value << " = ";

   for ( c = 1; c <= 16; c++ ) {
      cout << ( value & displayMask ? '1' : '0' );
      value <<= 1;

      if ( c % 8 == 0 )
         cout << ' ';
   }

   cout << endl;
}