fig16_05.cpp

这是C＋＋编程经典的书上实例的源代码。 （英文名是《C＋＋ how to program》第3版）

// Fig. 16.5: fig16_05.cpp
// Printing an unsigned integer in bits 
#include <iostream>

using std::cout;
using std::cin;

#include <iomanip>

using std::setw;
using std::endl;

void displayBits( unsigned );

int main()
{
   unsigned x;

   cout << "Enter an unsigned integer: ";
   cin >> x;
   displayBits( x );
   return 0;
}

void displayBits( unsigned value )
{
   const int SHIFT = 8 * sizeof( unsigned ) - 1;
   const unsigned MASK = 1 << SHIFT;

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

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

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

   cout << endl;
}




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