The following code example is taken from the book
C++ Templates - The Complete Guide
by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002
© Copyright David Vandevoorde and Nicolai M. Josuttis 2002
#include "accum3.hpp"
#include <iostream>
int main()
{
// create array of 5 integer values
int num[] = { 1, 2, 3, 4, 5 };
// print average value
std::cout << "the average value of the integer values is "
<< accum(&num[0], &num[5]) / 5
<< '\n';
// create array of character values
char name[] = "templates";
int length = sizeof(name)-1;
// (try to) print average character value
std::cout << "the average value of the characters in \""
<< name << "\" is "
<< accum(&name[0], &name[length]) / length
<< '\n';
}