RosettaCodeData/Task/Calendar/XPL0/calendar.xpl0

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include c:\cxpl\codes; \intrinsic 'code' declarations
func WeekDay(Year, Month, Day); \Return day of week (0=Sun 1=Mon..6=Sat)
int Year, Month, Day; \Works for years from 1583 onward
[if Month<=2 then [Month:= Month+12; Year:= Year-1];
return rem((Day-1 + (Month+1)*26/10 + Year + Year/4 + Year/100*6 + Year/400)/7);
];
proc Space(N); \Display N space characters
int N;
while N do [ChOut(0, ^ ); N:= N-1];
proc Calendar(Year); \Display calendar for specified year
int Year;
int Month, Col, C, Line, MoName, Days, DayMax, Day(3);
[MoName:= [
" January ", " February", " March ", " April ", " May ", " June ",
" July ", " August ", "September", " October", " November", " December"];
Space(35); Text(0, "[Snoopy]"); CrLf(0);
Space(37); IntOut(0, Year); CrLf(0);
CrLf(0);
for Month:= 1 to 12 do
[for Col:= 0 to 3-1 do
[Space(5); Text(0, MoName(Month+Col-1)); Space(7);
if Col<2 then Space(8);
];
CrLf(0);
for Col:= 0 to 3-1 do
[Text(0, "Su Mo Tu We Th Fr Sa");
if Col<2 then Space(9);
];
CrLf(0);
for Col:= 0 to 3-1 do \day of first Sunday of month (can be negative)
Day(Col):= 1 - WeekDay(Year, Month+Col, 1);
for Line:= 0 to 6-1 do
[for Col:= 0 to 3-1 do
[Days:= [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
DayMax:= Days(Month+Col);
if Month+Col=2 & (rem(Year/4)=0 & rem(Year/100)#0 ! rem(Year/400)=0) then
DayMax:= DayMax+1; \if February and leap year then add a day
for C:= 0 to 7-1 do
[if Day(Col)>=1 & Day(Col)<=DayMax then
[IntOut(0, Day(Col));
if Day(Col)<10 then Space(1); \left justify
]
else Space(2); \suppress out of range days
Space(1);
Day(Col):= Day(Col)+1;
];
if Col<2 then Space(8);
];
CrLf(0);
];
CrLf(0);
Month:= Month+2; \2+1 months per Col(umn)
];
];
Calendar(1969)