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"
int main()
{
const CPPBook::Fraction a(7,3); // declare fraction constant a
CPPBook::Fraction x; // declare fraction variable x
// new: output fraction a with stream operator
std::cout << a << std::endl;
// new: read fraction x
std::cout << "enter fraction (numer/denom): ";
if (! (std::cin >> x)) {
// input error: exit program with error status
std::cerr << "Error during input of fraction" << std::endl;
return EXIT_FAILURE;
}
std::cout << "Input was: " << x << std::endl;
// as long as x is less than 1000
while (x < CPPBook::Fraction(1000)) {
// multiply x by a
x = x * a;
// new: output with stream operator
std::cout << x << std::endl;
}
}