The empty object
The first step in a program of SYMMETRICA is the generation of an
object. This newly generated object is always an empty object. This
is done in the following program
#include "def.h"
#include "macro.h"
main()
{
OP object;
anfang();
object = callocobject(); /* generation of an object */
freeall(object); /* deletion of an object */
ende();
}
Using the routine callocobject() you generate an empty object. This
object must have been declared using the type OP, which is also
defined in "def.h". After all you have to delete the object, this
is done using the standard routine freeall(), which works for all
objects, not only with empty objects. If you print an empty object
you will get a "#", which is the symbol for the empty object. If
you change the above code into
...
object = callocobject(); /* generation of an object */
println(object);
freeall(object); /* deletion of an object */
...
you get the following line
#
harald.fripertinger "at" uni-graz.at, May 26,
2011
