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MODULE Ch1;
IMPORT Out;
PROCEDURE DigitalClock(Str:ARRAY OF CHAR):INTEGER;
BEGIN
IF Str[0] = '?' THEN
IF ORD(Str[1]) - ORD('0') < 4 THEN RETURN 2 ELSE RETURN 1 END;
ELSIF Str[1] = '?' THEN
IF ORD(Str[0]) - ORD('0') < 2 THEN RETURN 9 ELSE RETURN 3 END;
ELSIF Str[3] = '?' THEN
RETURN 5
ELSE
RETURN 9;
END;
END DigitalClock;
BEGIN
Out.Int(DigitalClock("?5:00"),0); Out.Ln;
Out.Int(DigitalClock("?3:00"),0); Out.Ln;
Out.Int(DigitalClock("1?:00"),0); Out.Ln;
Out.Int(DigitalClock("2?:00"),0); Out.Ln;
Out.Int(DigitalClock("12:?5"),0); Out.Ln;
Out.Int(DigitalClock("12:5?"),0); Out.Ln;
END Ch1.
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