program Calendar;
uses CRT;
{
Modified for Lowyat.NET
Courtesy bluebat from github
}
const
PointYear=2019;
BeginMonth=1;
EndMonth=12;
var
MonthDays:array [1..12] of integer;
KnownYear,FirstOrder:integer;
Year,Month,LDay,RDay,LOrder,ROrder:integer;
HaveNext:boolean;
function YearDays(Year:integer):integer;
begin
if (Year mod 4)=0 then
if (Year mod 100)=0 then
if (Year mod 400)=0 then YearDays:=2 else YearDays:=1
else Yeardays:=2
else YearDays:=1
end;
procedure DayLine(var Day:integer;Order:integer);
begin
repeat
if Day = 0 then Write('':5*Order);
Day:=Day+1;
if Day <= MonthDays[Month] then Write(Day:2,' ') else Write(' ':5)
until (Order + Day) mod 7 = 0
end;
begin
WriteLn('This program will show a calendar of a pointed year.');
WriteLn;
for Month:=1 to 12 do
case Month of
1,3,5,7,8,10,12 :MonthDays[Month]:=31;
4,6,9,11 :MonthDays[Month]:=30;
2 :MonthDays[Month]:=28
end;
KnownYear:=1;
FirstOrder:=1;
for Year:=KnownYear to PointYear - 1 do
FirstOrder:=FirstOrder + YearDays(Year);
FirstOrder:=FirstOrder mod 7;
if YearDays(PointYear) = 2 then MonthDays[2]:=29;
WriteLn;
if BeginMonth <> EndMonth then Write(' ':30);
WriteLn('*** ',PointYear,' ***');
Month:=1;
repeat
if Month >= BeginMonth then
begin
HaveNext:=Month + 1 <= EndMonth;
WriteLn;
Write('=== ',Month:2,' ===');
if HaveNext then WriteLn(' ':29,'=== ',Month+1:2,' ===') else WriteLn;
WriteLn;
Write('SUN MON TUE WED THR FRI SAT ');
if HaveNext then WriteLn('SUN MON TUE WED THR FRI SAT') else WriteLn;
LDay:=0;
LOrder:=FirstOrder;
if HaveNext then
begin
FirstOrder:=(FirstOrder + MonthDays[month]) mod 7;
RDay:=0;
ROrder:=FirstOrder;
end else RDay:=32;
repeat
DayLine(LDay,LOrder);
Write(' ':4);
if HaveNext then
begin
Month:=Month + 1;
DayLine(RDay,ROrder);
Month:=Month - 1
end;
WriteLn;
until (LDay > MonthDays[Month]) and (RDay > MonthDays[Month + 1]);
Month:=Month + 1
end;
FirstOrder:=(FirstOrder + MonthDays[Month]) mod 7;
Month:=Month + 1
until Month > EndMonth;
end.
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