(разн.) ← Предыдущая | Текущая версия (разн.) | Следующая → (разн.)
Demonstrate bitwise exclusive OR
#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 = 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 );
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
139 = 00000000 00000000 00000000 10001011
199 = 00000000 00000000 00000000 11000111
using the bitwise exclusive OR operator ^ is
76 = 00000000 00000000 00000000 01001100
Use XOR to encode and ecode a message
#include <iostream>
using namespace std;
int main()
{
char msg[] = "This is a test";
char key = 123;
cout << "Original message: " << msg << "\n";
for(int i = 0 ; i < strlen(msg); i++)
msg[i] = msg[i] ^ key;
cout << "Encoded message: " << msg << "\n";
for(int i = 0 ; i < strlen(msg); i++)
msg[i] = msg[i] ^ key;
cout << "Decoded message: " << msg << "\n";
return 0;
}Original message: This is a test
Encoded message: /[[?[��
Decoded message: This is a test
