Bitwise Operators and its meaning - C++ Operator

C++ examples for Operator:Bit Operator

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Introduction

OperatorDescription
~ bitwise complement operator is a unary operator that inverts the bits in its operand, so 1 becomes 0 and 0 becomes 1.
& bitwise AND operator ANDs corresponding bits in its operands. If the corresponding bits are both 1, then the resulting bit is 1, otherwise, it's 0.
^ bitwise exclusive OR operator exclusive-ORs corresponding bits in its operands. If the corresponding bits are different, then the result is 1. If the corresponding bits are the same, the result is 0.
| bitwise OR operator ORs corresponding bits in its operands. If either bit is 1, then the result is 1. If both bits are 0, then the result is 0.

Demo Code

#include <iostream>
#include <iomanip>
using std::setw;//from   w  w w .  j a  va  2 s  . c om

int main()
{
  unsigned int red {0XFF0000U};             // Color red
  unsigned int white {0XFFFFFFU};           // Color white - RGB all maximum

  std::cout << std::hex                     // Hexadecimal output
            << std::setfill('0');           // Fill character 0

  std::cout << "Try out bitwise AND and OR operators:";
  std::cout << "\nInitial value red = " << setw(8) << red;
  std::cout << "\nComplement   ~red = " << setw(8) << ~red;

  std::cout << "\nInitial value   white = " << setw(8) << white;
  std::cout << "\nComplement     ~white = " << setw(8) << ~white;

  std::cout << "\nBitwise AND red & white = " << setw(8) << (red & white);
  std::cout << "\nBitwise  OR red | white = " << setw(8) << (red | white);

  std::cout << "\n\nNow try successive exclusive OR operations:";
  unsigned int mask {red ^ white};
  std::cout << "\nmask  = red ^ white  = " << setw(8) << mask;
  std::cout << "\n          mask ^ red = " << setw(8) << (mask ^ red);
  std::cout << "\n        mask ^ white = " << setw(8) << (mask ^ white);

  unsigned int flags {0xFF};                // Flags variable
  unsigned int bit1mask {0x1};              // Selects bit 1
  unsigned int bit6mask {0x20};             // Selects bit 6
  unsigned int bit20mask {0x80000};         // Selects bit 20

  std::cout << "\n\nUse masks to select or set a particular flag bit:";
  std::cout << "\nSelect bit 1 from flags   : " << setw(8) << (flags & bit1mask);
  std::cout << "\nSelect bit 6 from flags   : " << setw(8) << (flags & bit6mask);
  std::cout << "\nSwitch off bit 6 in flags : " << setw(8) << (flags &= ~bit6mask);
  std::cout << "\nSwitch on bit 20 in flags : " << setw(8) << (flags |= bit20mask)
            << std::endl;
}

Result


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