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Task/Long-year/XPL0/long-year.xpl0
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Task/Long-year/XPL0/long-year.xpl0
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\Long year
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code Rem=2, CrLf=9, IntIn=10, IntOut=11, Text=12, Clear=40;
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integer S, E, Y;
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function integer Weekday(Y);
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\Weekday of Y-12-31, 0 Sunday
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integer Y;
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return Rem((Y + Y / 4 - Y / 100 + Y / 400) / 7);
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function integer IsLongYear(Y);
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integer Y;
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return 4 = Weekday(Y) ! 3 = Weekday(Y - 1);
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begin
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Clear;
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Text(0, "**** List of ISO long years ****");
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CrLf(0);
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Text(0, "Start year: "); S:= IntIn(0);
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Text(0, "End year: "); E:= IntIn(0);
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CrLf(0);
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for Y:= S, E do
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if IsLongYear(Y) then [IntOut(0, Y); Text(0, " ")];
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CrLf(0);
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end
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