Dear c/g++ advanced programers: I copied and tried to test a piece simple code which is used for (Hardcoding a Unicode String) from the book ( C++ Cookbook) by D. Ryan Stephens, Christopher Diggins, Jonathan Turkanis, and Jeff Cogswell at Chapter 13, Internationalization, section 1: Hardcoding a Unicode String example 13-1, it can compile and run on my g++4.5.2, but I don't quite satisfy its result -------------------- //Example 13-1 Hardcoding a Unicode string #include <iostream> #include <fstream> #include <string> using namespace std; int main() { // Create some strings with Unicode characters wstring ws1 = L"Infinity: \u221E"; wstring ws2 = L"Euro: \u0128"; wchar_t w[] = L"Infinity: \u221E"; wofstream out("tmp\\unicode.txt"); out << ws2 << endl; wcout << ws2 << endl; } ---------------------------------------------- root@eric-laptop:/home/eric/cppcookbook# ./a.out Euro: ? root@eric-laptop:/home/eric/cppcookbook# ls -l -a total 56 drwxr-xr-x 2 eric eric 4096 2011-06-25 22:51 . drwxr-xr-x 60 eric eric 4096 2011-06-25 22:51 .. -rwxr-xr-x 1 root root 8666 2011-06-25 22:51 a.out -rw-r--r-- 1 eric eric 7372 2011-06-25 20:07 erreta -rw-r--r-- 1 eric eric 750 2011-05-21 09:38 example12-1.cpp -rw-r--r-- 1 eric eric 385 2011-06-25 22:51 example13-1.cpp -rw-r--r-- 1 eric eric 709 2011-06-25 21:12 example7-11.cpp -rw-r--r-- 1 eric eric 366 2011-06-25 20:02 example7-12.cpp -rw-r--r-- 1 eric eric 954 2011-06-25 19:02 example7-2.cpp -rw-r--r-- 1 eric eric 402 2011-06-01 20:55 example9-1.cpp -rw-r--r-- 1 root root 0 2011-06-25 22:51 tmp\unicode.txt -rw-r--r-- 1 eric eric 564 2011-06-25 19:00 utils.h root@eric-laptop:/home/eric/cppcookbook# --------------------------------------------------------------------------------------------- as you can see , it didn't output to file (tmp\unicode.txt) anything. but it did output a little thing on screen. Why is that? is that suppose it should be on your system? looking to see any advancer's help/hint/link and thanks a lot in advance, Eric