/* Code for exercise 5.6. |  | "C++ Solutions--Companion to The C++ Programming Language, Third Edition" | by David Vandevoorde; Addison-Wesley 1998; ISBN 0-201-30965-3. | | Permission to use, copy, modify, distribute and sell this software | and its documentation for any purpose is hereby granted without fee. | The author makes no representations about the suitability of this | software for any purpose.  It is provided "as is" without express or | implied warranty. `----------------------------------------------------------------------*//* Notes:This file should not compile properly and instead your compilershould diagnose various errors.*/#include <iostream>void f(char c) { std::cout << c << std::endl; }void g(char &c) { std::cout << c << std::endl; }void h(char const &c) { std::cout << c << std::endl; }int main() {   char c;   unsigned char uc;   signed char sc;   f('a');   f(49);   f(3300); // OK, but probably dangerous   f(c);   f(uc);   f(sc);   g('a'); // Error   g(49); // Error   g(3300); // Error   g(c);   g(uc); // Error: unsigned char->char produces rvalue   g(sc); // Error: signed char->char produces rvalue   h('a'); // Temporary   h(49); // Temporary   h(3300); // Temporary, probably dangerous   h(c);   h(uc); // Temporary (possibly dangerous)   h(sc); // Temporary (possibly dangerous)   return 0;}