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87 lines
2.0 KiB
87 lines
2.0 KiB
2 years ago
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let
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const max ~ 9999;
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const invalid ~ 0-1;
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type Money ~ Integer; ! 0 .. max
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type Trans ~ Char; ! 'd' | 'w' | 'q'
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func sum (m: Money, n: Money): Money ~
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let const s ~ m + n
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in
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if s <= max then s else invalid;
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func diff (m: Money, n: Money): Money ~
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let const d ~ m - n
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in
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if 0 <= d then d else invalid;
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proc gettrans (var code: Trans,
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var amount: Money) ~
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begin
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get(var code);
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if code = 'q' then
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! skip
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else
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begin
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getint(var amount);
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if (0 > amount) \/ (amount > max) then
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begin
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amount := invalid; code := '?'
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end
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else if (code \= 'd') /\ (code \= 'w') then
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code := '?'
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else
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! ok
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end;
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geteol()
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end;
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proc processtrans (code: Trans,
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amount: Money,
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var balance: Money) ~
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let
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var newbalance: Money
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in
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begin
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if code = 'd' then
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begin
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put('D'); put('e'); put('p'); put('o'); put('s');
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put('i'); put('t'); put(' ');
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putint(amount); puteol();
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newbalance := sum(balance, amount)
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end
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else if code = 'w' then
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begin
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put('W'); put('i'); put('t'); put('h'); put('d');
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put('r'); put('a'); put('w'); put(' ');
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putint(amount); puteol();
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newbalance := diff(balance, amount)
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end
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else
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; !skip
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if (code = '?') \/ (newbalance = invalid) then
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begin
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put('I'); put('n'); put('v'); put('a'); put('l');
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put('i'); put('d'); puteol()
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end
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else
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balance := newbalance;
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put('B'); put('a'); put('l'); put('a'); put('n');
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put('c'); put('e'); put(' ');
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putint(balance); puteol();
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end;
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var balance: Money;
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var amount: Money;
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var trans: Trans
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in
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begin
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balance := 0;
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gettrans(var trans, var amount);
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while trans \= 'q' do
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begin
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processtrans(trans, amount, var balance);
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gettrans(var trans, var amount)
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end
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end
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