fig16_07.cpp

经典vc教程的例子程序

// Fig. 16.7: fig16_07.cpp
// Using the bitwise AND, bitwise inclusive OR, bitwise
// exclusive OR, and bitwise complement operators.
#include <iostream.h>
#include <iomanip.h>

void displayBits( unsigned );

int main()
{
   unsigned number1, number2, mask, setBits;

   number1 = 65535;
   mask = 1;
   cout << "The result of combining the following\n";
   displayBits( number1 );
   displayBits( mask );
   cout << "using the bitwise AND operator & is\n";
   displayBits( number1 & mask );

   number1 = 15;
   setBits = 241;
   cout << "\nThe result of combining the following\n";
   displayBits( number1 );
   displayBits( setBits );
   cout << "using the bitwise inclusive OR operator | is\n";
   displayBits( number1 | setBits );

   number1 = 139;
   number2 = 199;
   cout << "\nThe result of combining the following\n";
   displayBits( number1 );
   displayBits( number2 );
   cout << "using the bitwise exclusive OR operator ^ is\n";
   displayBits( number1 ^ number2 );

   number1 = 21845;
   cout << "\nThe one's complement of\n";
   displayBits( number1 );
   cout << "is" << endl;
   displayBits( ~number1 );

   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;
}