std::boolalpha is a stream manipulator to print the boolian values false and true as 'false' and 'true' instead of '0' and '1'.

Project and source code

Operating system: Ubuntu 10.04 LTS Lucid Lynx

IDE: Qt Creator 2.0.0

Project type: Qt4 Console Application

Compiler: G++ 4.4.1

Libraries used:

STL: from GCC, shipped with Qt Creator 2.0.0

Download the Qt Creator project 'CppBoolalpha' (zip)

main.cpp


#include <iomanip>

#include <iostream>





int main()

{

  const bool f = false;

  const bool t = true;



  std::cout

    << "False: " << f << '\n'

    << "True: "  << t << '\n';



  std::cout << std::boolalpha;



  std::cout

    << "False: " << f << '\n'

    << "True: "  << t << '\n';

}

Screen output:


False: 0

True: 1

False: false

True: true

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(C++) std::boolalpha

Project and source code

main.cpp