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4f1e5c34b1
BSD-2-Clause: https://github.com/jscert/jscert * JSCorrectness.v * JSInterpreterExtraction.v * JSNumber.v * JSPrettyInterm.v MIT/Expat: https://github.com/clarus/coq-atm * Computation.v * Main.v * Spec.v
43 lines
1.3 KiB
Coq
43 lines
1.3 KiB
Coq
Require Import FunctionNinjas.All.
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Require Import ListString.All.
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Require Import Computation.
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Import C.Notations.
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Definition error (message : LString.t) : C.t :=
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do_call! Command.ShowError message in
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ret.
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Definition main : C.t :=
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call! card_is_valid := Command.AskCard in
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if card_is_valid then
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call! pin := Command.AskPIN in
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match pin with
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| None => error @@ LString.s "No PIN given."
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| Some pin =>
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call! pin_is_valid := Command.CheckPIN pin in
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if pin_is_valid then
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call! ask_amount := Command.AskAmount in
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match ask_amount with
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| None => error @@ LString.s "No amount given."
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| Some amount =>
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call! amount_is_valid := Command.CheckAmount amount in
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if amount_is_valid then
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call! card_is_given := Command.GiveCard in
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if card_is_given then
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call! amount_is_given := Command.GiveAmount amount in
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if amount_is_given then
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ret
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else
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error @@ LString.s "Cannot give you the amount. Please contact your bank."
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else
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error @@ LString.s "Cannot give you back the card. Please contact your bank."
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else
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error @@ LString.s "Invalid amount."
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end
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else
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error @@ LString.s "Invalid PIN."
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end
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else
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error @@ LString.s "Invalid card.".
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