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 <iostream> // C++ header file for I/O
#include "string.hpp" // C++ header file for strings
int main()
{
typedef CPPBook::String string;
// create two strings
string firstname = "Jicolai";
string lastname = "Nosuttis";
string name;
// mix up the first characters of the string
char c = firstname[0];
firstname[0] = lastname[0];
lastname[0] = c;
std::cout << firstname << ' ' << lastname << std::endl;
}