
I took the liberty of already adding the API to compose Yacas  
expression trees,
executing them, and pulling them apart. This is just a preliminary  
stab at it, we
can change it of course (removing void* for something else say). It  
was relatively
little work.

You can get it from our cvs tree at sourceforge. libcyacas.a is the  
library, src/cyacas.h
defines the interface. I rolled a little example embed/example4.c. If  
you run it you see
the spectacular calculation "1+1" being performed :-)

     Input>  (+ 1 1 )
     Output>  2

The source code for this can be found below, to give you an  
indication of how this
API would work.

What do you think? Would that work for you?
Ayal






#include <stdio.h>
#include "cyacas.h"

int verbose_debug = 0;    // avoid linkage error

void print_expr(void* object)
{
   if (object == NULL)
     return;
   if (yacas_object_is_sublist(object))
   {
     printf("(");
     print_expr(yacas_get_sublist(object));
     printf(")");
   }
   else
   {
     printf("%s ",yacas_get_atom(object));
     print_expr(yacas_get_next(object));
   }
}
void runexpr(void* object)
{
   printf("Input>  ");
   print_expr(object);
   printf("\n");
   void* result = yacas_execute(object);
   printf("Output>  ");
   print_expr(result);
   printf("\n");
   yacas_delete_object(result);
}

int main(int argc, char** argv)
{
   int i;
   yacas_init();

   void *input =
     yacas_create_sublist(
       yacas_link_objects(
         yacas_create_atom("+"),
         yacas_link_objects(
           yacas_create_atom("1"),
           yacas_create_atom("1")
         )
       )
     );
   runexpr(input);

   yacas_delete_object(input);
   yacas_exit();
   return 0;
}


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