home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
cs.rhul.ac.uk
/
www.cs.rhul.ac.uk.zip
/
www.cs.rhul.ac.uk
/
pub
/
CS375
/
prize.csp
< prev
next >
Wrap
Text File
|
1999-01-22
|
559b
|
25 lines
channel year1, year2, year3, pass, fail, graduate, present, prize
S = {| year1, year2, year3, pass, fail, graduate |}
P = {| pass, present |}
C = {| pass, fail, prize |}
STUDENT = year1 -> (pass -> YEAR2 [] fail -> STUDENT)
YEAR2 = year2 -> (pass -> YEAR3 [] fail -> YEAR2)
YEAR3 = year3 -> (pass -> graduate -> STOP [] fail -> YEAR3)
PARENT = pass -> present -> PARENT
COLLEGE = fail -> STOP [] pass -> C1
C1 = fail -> STOP [] pass -> C2
C2 = fail -> STOP [] pass -> prize -> STOP
SYSTEM = (STUDENT [ S || P ] PARENT) [ union(S,P) || C ] COLLEGE