Natural semantics for repeat
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[ repeat tt ns ] <S, s>  s’ <repeat S until B, s>  s’. if B b s ’= tt. Natural Semantics for Repeat. [ repeat ff ns ] <S , s>  s’, <while b do S, s’>  s’’ <while b do S, s>  s’’ . if B b s ’=ff. Random. If n N. [ random ns ] <random(x) , s>  s[x n].

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Natural semantics for repeat

[repeatttns] <S, s>  s’<repeat S until B, s>  s’

if Bbs’=tt

Natural Semantics for Repeat

[repeatffns] <S , s>  s’, <while b do S, s’>  s’’ <while b do S, s>  s’’

if Bbs’=ff


Random
Random

If n N

[randomns] <random(x) , s>  s[x n]

[randomsos] <random(x) , s>  s[x n]

If n N

x :=0 ;

finish := false;

while not finish do (finish := true or x := x +1)


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