Use masks to select or set a particular flag bit : binary bit « Data Types

Use masks to select or set a particular flag bit : binary bit « Data Types « C++ Tutorial

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C++ Tutorial » Data Types » binary bit

2.13.5.Use masks to select or set a particular flag bit

#include <iostream>

#include <iomanip>

using std::cout;

using std::endl;

using std::setfill;

using std::setw;



int main() {

  unsigned long flags = 0xFF;          // Flags variable

  unsigned long bit1mask = 0x1;        // Selects bit 1

  unsigned long bit6mask = 0x20;       // Selects bit 6

  unsigned long bit20mask = 0x80000;   // Selects bit 20

  

  cout << "\nSelect bit 1 from flags    : " << setw(8) << (flags & bit1mask);

  cout << "\nSelect bit 6 from flags    : " << setw(8) << (flags & bit6mask);

  cout << "\nSwitch off bit 6 in flags  : " << setw(8) << (flags &= ~bit6mask);



  cout << "\nSwitch on bit 20 in flags  : " << setw(8) << (flags |= bit20mask);



  cout << endl;



  return 0;

}

Select bit 1 from flags    :        1
Select bit 6 from flags    :       32
Switch off bit 6 in flags  :      223
Switch on bit 20 in flags  :   524511

2.13.binary bit
	2.13.1.	Printing an unsigned integer in bits
	2.13.2.	Display the bits within a byte.
	2.13.3.	Bitwise operators: Complement, AND, OR
	2.13.4.	Bitwise operator: ^
	2.13.5.	Use masks to select or set a particular flag bit

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