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MACHINE Feu
SETS ETAT = on, off CONCRETE VARIABLES rr, oo, vv
INVARIANT
rr ETAT oo ETAT vv ETAT (rr = on (oo = off vv = off))
(oo = on (rr = off vv = off)) (vv = on (rr = off oo = off))
INITIALISATION rr, oo, vv := off, on, off
OPERATIONS
estRouge
estIlRouge BEGIN estRouge := bool (rr = on) END ;
estOrange
estIlOrange BEGIN estOrange := bool (oo = on) END ;
estIlVert BEGIN estVert := bool (vv = on) END ;
estVert
devientRouge BEGIN rr, oo, vv := on, off, off END ;
devientOrange BEGIN rr, oo, vv := off, on, off END ;
devientVert BEGIN rr, oo, vv := off, off, on END ;
END
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