Demonstrating stream-manipulators boolalpha and noboolalpha. : cout « Development « C++ Tutorial

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#include <iostream>
using std::boolalpha;
using std::cout;
using std::endl;
using std::noboolalpha;

int main()
{
   bool booleanValue = true;

   cout << "booleanValue is " << booleanValue << endl;

   cout << "booleanValue (after using boolalpha) is "<< boolalpha << booleanValue << endl << endl;

   booleanValue = false; // change booleanValue
   cout << noboolalpha << endl; // use noboolalpha

   cout << "booleanValue is " << booleanValue << endl;

   cout << "booleanValue (after using boolalpha) is " << boolalpha << booleanValue << endl;
   return 0;
}

booleanValue is 1
booleanValue (after using boolalpha) is true


booleanValue is 0
booleanValue (after using boolalpha) is false