Cout boolalpha

// modify boolalpha flag
#include <iostream>     // std::cout, std::boolalpha, std::noboolalpha

int main () {
  bool b = true;
  std::cout << std::boolalpha << b << '\n';
  std::cout << std::noboolalpha << b << '\n';
  return 0;
}

Source: cplusplus.com

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