C++ Tutorial/Operators statements/bitwise OR — различия между версиями
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Текущая версия на 10:30, 25 мая 2010
Demonstrate bitwise |
#include <iostream>
using std::cout;
#include <iomanip>
using std::endl;
using std::setw;
void displayBits( unsigned );
int main()
{
unsigned number1;
unsigned number2;
unsigned mask;
unsigned setBits;
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 );
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 combining the following
15 = 00000000 00000000 00000000 00001111
241 = 00000000 00000000 00000000 11110001
using the bitwise inclusive OR operator | is
255 = 00000000 00000000 00000000 11111111
Lowercase letters using bitwise OR.
#include <iostream>
using namespace std;
int main()
{
char ch;
for(int i = 0 ; i < 10; i++) {
ch = "A" + i;
// This statement turns on the 6th bit.
cout << ch << " " ;
ch = ch | 32;
cout << ch << "\n";
}
return 0;
}A a B b C c D d E e F f G g H h I i J j
