Create user-defined, nonparameterized stream manipulators: bell manipulator (using escape sequence \a) : output manipulator « Development « C++ Tutorial

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2. Development
3. output manipulator

#include <iostream>
using std::ostream;
using std::cout;
using std::flush;

ostream& bell( ostream& output )
{
   return output << '\a';  // issue system beep
} 

int main()
{

   cout << bell; // use bell manipulator
   return 0;
}