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implementation module StdStack
import StdEnv
:: Stack a :== [a]
newStack :: (Stack a)
newStack = []
push :: a (Stack a) -> (Stack a)
push a s = s ++ [a]
pop
Start = ( "s0 = newStack = ", s0,'\n'
, "s1 = push 1 s0 = ", s1,'\n'
, "s2 = pushes [2..5] s1 = ",s2,'\n'
, "s3 = pop s2 = ", s3,'\n'
, "s4 = popn 3 s3 = ", s4,'\n'
, "s5 = top s4 = ", s5,'\n'
, "s6 = topn 3 s2 = ", s6,'\n'
, "s7 = elements s2 = ", s7,'\n'
)
where
s0 = newStack
s1 = push 1 s0
s2 = pushes [2..5] s1
s3 = pop s2
s4 = popn 3 s3
s5 = top s4
s6 = topn 3 s2
s7 = elements s2
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