The following code example is taken from the book
Object-Oriented Programming in C++
by Nicolai M. Josuttis, Wiley, 2002
© Copyright Nicolai M. Josuttis 2002
// include standard header files
#include <iostream>
#include <cstdlib>
// include header files for the classes that are being used
#include "frac.hpp"
#include "ftest10read.cpp"
#include "ftest10.cpp"