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 header file with the declaration of crosssum()
#include "cross.hpp"
// include header file for I/O
#include <iostream>
// forward declaration of printCrosssum()
void printCrosssum(long);
// implementation of main()
int main()
{
printCrosssum(12345678);
printCrosssum(0);
printCrosssum(13*77);
}
// implementation of printCrosssum()
void printCrosssum(long number)
{
std::cout << "the cross sum of " << number
<< " is " << crosssum(number) << std::endl;
}