Demonstrate how to get the size of a variable.

See also: Host introspection

 
put skip list (SIZE(x)); /* gives the number of bytes occupied by X */
                         /* whatever data type or structure it is.  */
 
put skip list (CURRENTSIZE(x));
                         /* gives the current number of bytes of X  */
                         /* actually used by such things as a       */
                         /* varying-length string, including its    */
                         /* length field.                           */
 