fig19_17.cpp

// fig19_17.cpp
// Stream manipulators boolalpha and noboolalpha.
#include <iostream>

int main() {
   bool booleanValue{true};

   // display default true booleanValue
   std::cout << "booleanValue is " << booleanValue;

   // display booleanValue after using boolalpha
   std::cout << "\nbooleanValue (after using boolalpha) is "
      << std::boolalpha << booleanValue;

   std::cout << "\n\nswitch booleanValue and use noboolalpha\n";
   booleanValue = false; // change booleanValue
   std::cout << std::noboolalpha; // use noboolalpha

   // display default false booleanValue after using noboolalpha
   std::cout << "\nbooleanValue is " << booleanValue;

   // display booleanValue after using boolalpha again
   std::cout << "\nbooleanValue (after using boolalpha) is "
      << std::boolalpha << booleanValue << "\n";
} 





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