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#include < ruby.h > //
static int id_sum;
int Values[] = {5, 10 ,15,-1,20,0};
static VALUE wrap_sum(VALUE args)
{
 VALUE * values = (VALUE *) args;
 VALUE summer = values[0]; 
 VALUE max = values[1];
 return rb_funcall(summer,id_sum,1,max);
}
static VALUE protected_sum(VALUE summer, VALUE max)
{
 int error;  VALUE args[2];
 VALUE result;
 args[0] = summer;
 args[1] = max;
 result = rb_protect(wrap_sum,(VALUE)args, &error);
 return error ? Qnil:result;
}
int main()
{
 int value;
 int *next = Values;
 ruby_init();
 ruby_init_loadpath();
 ruby_script("embedded");
 rb_require("sum.rb");
 VALUE summer = rb_class_new_instance(0,0,rb_const_get(rb_cObject,rb_intern("Summer")));
 id_sum = rb_intern("sum");
 while (value = *next++) 
 {
  VALUE result = protected_sum(summer,INT2NUM(value)); 
  if (NIL_P(result))
  {
   printf("Sum to %d doesn't compute!\n",value);
  }
  else 
   printf("Sum to %d is %d\n",value,NUM2INT(result));
 }
ruby_finalize();
}


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