/* So you want to get going in a hurry?  To illustrate the use of SWIG,
 suppose you have some C functions you want added to Tcl, Perl, Python, Java and C#.
 Specifically, let's say you have them in a file 'example.c'

 /* example.c */
 #include <time.h>;
 double My_variable = 3.0;
 int fact(int n)
 {
   if (n <= 1) return 1;
   else        return n*fact(n-1);
 }

 int my_mod(int x, int y)
 {
   return (x%y);
 }

 char *get_time()
 {
   time_t ltime;
   time(&amp;ltime);
   return ctime(&ltime);
 }

 Interface file
 Now, in order to add these files to your favorite language, you need to write an
 "interface file" which is the input to SWIG.  An interface file for these
 C functions might look like this :

 /* example.i   SWIG interface file*/
 %module example
 %{
 /* Put header files here or function declarations like below */
 extern double My_variable;
 extern int fact(int n);
 extern int my_mod(int x, int y);
 extern char *get_time();
 %}

 extern double My_variable;
 extern int fact(int n);
 extern int my_mod(int x, int y);
 extern char *get_time();

Building a Python module

 Turning C code into a Python module is also easy.
 Simply do the following (shown for Irix, see the
 <a href="http://www.dabeaz.com/cgi-bin/wiki.pl?SwigFaq/SharedLibraries">
 SWIG Wiki Shared Libraries</a> page for help with other operating systems):

 unix% swig -python example.i
 unix% gcc -c example.c example_wrap.c -I/usr/include/python2.4
 unix% ld -shared example.o example_wrap.o -o _example.so

 We can now use the Python module as follows :
             import example
             example.fact(5)
             example.my_mod(7,3)
             example.get_time()