*
* Calling the recursive "fact" procedure:
*
*  input  to  "fact": *n*
* output from "fact": *n_fact*
*
*    use to compute n!
*
 PROCEDURE fact      ;
 INTEGER   n := 8    ;
 INTEGER   n_fact    ;
 fact ::    <<n>> >>n_fact<< ;
 ECHO "FACTORIAL:" n $Bang_S "=" + n_fact ;
 QUIT " Program *xfact* XREF " .