?? ex22_19.cpp
字號:
// Exercise 22.19: ex22_19.cpp
#include <iostream>
using std::cout;
using std::cin;
using std::endl;
using std::boolalpha;
bool mystery( unsigned );
int main()
{
unsigned x;
cout << "Enter an integer: ";
cin >> x;
cout << boolalpha
<< "The result is " << mystery( x ) << endl;
return 0;
} // end main
// What does this function do?
bool mystery( unsigned bits )
{
const int SHIFT = 8 * sizeof( unsigned ) - 1;
const unsigned MASK = 1 << SHIFT;
unsigned total = 0;
for ( int i = 0; i < SHIFT + 1; i++, bits <<= 1 )
if ( ( bits & MASK ) == MASK )
total++;
return !( total % 2 );
} // end function mystery
/**************************************************************************
* (C) Copyright 1992-2005 by Deitel & Associates, Inc. and *
* Pearson Education, Inc. All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have used their *
* best efforts in preparing the book. These efforts include the *
* development, research, and testing of the theories and programs *
* to determine their effectiveness. The authors and publisher make *
* no warranty of any kind, expressed or implied, with regard to these *
* programs or to the documentation contained in these books. The authors *
* and publisher shall not be liable in any event for incidental or *
* consequential damages in connection with, or arising out of, the *
* furnishing, performance, or use of these programs. *
*************************************************************************/
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