Calendar
You are encouraged to solve this task according to the task description, using any language you may know.
Create a routine that will generate an ASCII calendar for any date. Test the calendar by generating a calendar for the year 1969 on a line printer of the time with a width of 132 characters.
Ideally the program will generate well formatted calendars for any page width from 20 characters up.
Kudos (κῦδος) for routines that also correctly transition from Julian to Gregorian calendar in September 1752.
This task is inspired by Real Programmers Don't Use PASCAL by Ed Post, Datamation, volume 29 number 7, July 1983.
THE REAL PROGRAMMER'S NATURAL HABITAT "Taped to the wall is a line-printer Snoopy calender for the year 1969."
For economy of size, do not actually include Snoopy generation in either the code or the output, instead just output a place-holder.
ALGOL 68
<lang algol68>#!/usr/local/bin/a68g --script #
PROC print calendar = (INT year, page width)VOID: (
[]STRING month names = (
"January","February","March","April","May","June",
"July","August","September","October","November","December"),
weekday names = ("Su","Mo","Tu","We","Th","Fr","Sa");
FORMAT weekday fmt = $g,n(UPB weekday names - LWB weekday names)(" "g)$;
# Juggle the calendar format to fit the printer/screen width # INT day width = UPB weekday names[1], day gap=1; INT month width = (day width+day gap) * UPB weekday names-1; INT month heading lines = 2; INT month lines = (31 OVER UPB weekday names+month heading lines+2); # +2 for head/tail weeks # INT year cols = (page width+1) OVER (month width+1); INT year rows = (UPB month names-1)OVER year cols + 1; INT month gap = (page width - year cols*month width + 1)OVER year cols; INT year width = year cols*(month width+month gap)-month gap; INT year lines = year rows*month lines;
MODE MONTHBOX = [month lines, month width]CHAR; MODE YEARBOX = [year lines, year width]CHAR;
INT week start = 1; # Sunday #
PROC days in month = (INT year, month)INT:
CASE month IN 31,
IF year MOD 4 EQ 0 AND year MOD 100 NE 0 OR year MOD 400 EQ 0 THEN 29 ELSE 28 FI,
31, 30, 31, 30, 31, 31, 30, 31, 30, 31
ESAC;
PROC day of week = (INT year, month, day)INT: ( # Day of the week by Zeller’s Congruence algorithm from 1887 # INT y := year, m := month, d := day, c; IF m <= 2 THEN m +:= 12; y -:= 1 FI; c := y OVER 100; y %*:= 100; (d - 1 + ((m + 1) * 26) OVER 10 + y + y OVER 4 + c OVER 4 - 2 * c) MOD 7 );
MODE SIMPLEOUT = UNION(STRING, []STRING, INT);
PROC cputf = (REF[]CHAR out, FORMAT fmt, SIMPLEOUT argv)VOID:( FILE f; STRING s; associate(f,s); putf(f, (fmt, argv)); out[:UPB s]:=s; close(f) );
PROC month repr = (INT year, month)MONTHBOX:( MONTHBOX month box; FOR line TO UPB month box DO month box[line,]:=" "* 2 UPB month box OD; STRING month name = month names[month];
# center the title # cputf(month box[1,(month width - UPB month name ) OVER 2+1:], $g$, month name); cputf(month box[2,], weekday fmt, weekday names);
INT first day := day of week(year, month, 1);
FOR day TO days in month(year, month) DO
INT line = (day+first day-week start) OVER UPB weekday names + month heading lines + 1;
INT char =((day+first day-week start) MOD UPB weekday names)*(day width+day gap) + 1;
cputf(month box[line,char:char+day width-1],$g(-day width)$, day)
OD;
month box
);
PROC year repr = (INT year)YEARBOX:(
YEARBOX year box;
FOR line TO UPB year box DO year box[line,]:=" "* 2 UPB year box OD;
FOR month row FROM 0 TO year rows-1 DO
FOR month col FROM 0 TO year cols-1 DO
INT month = month row * year cols + month col + 1;
IF month > UPB month names THEN
done
ELSE
INT month col width = month width+month gap;
year box[
month row*month lines+1 : (month row+1)*month lines,
month col*month col width+1 : (month col+1)*month col width-month gap
] := month repr(year, month)
FI
OD
OD;
done: year box
);
INT center = (year cols*(month width+month gap) - month gap - 1) OVER 2; INT indent = (page width - year width) OVER 2;
printf(( $n(indent + center - 9)k g l$, "[Insert Snoopy here]", $n(indent + center - 1)k 4d l$, year, $l$, $n(indent)k n(year width)(g) l$, year repr(year) ))
);
main: ( CO inspired by http://www.ee.ryerson.ca/~elf/hack/realmen.html
Real Programmers Don't Use PASCAL - Ed Post
Datamation, volume 29 number 7, July 1983
THE REAL PROGRAMMER'S NATURAL HABITAT
"Taped to the wall is a line-printer Snoopy calender for the year 1969." CO
INT mankind stepped on the moon = 1969,
line printer width = 132; # as at 1969! #
print calendar(mankind stepped on the moon, line printer width)
)</lang> Output:
[Insert Snoopy here]
1969
January February March April May June
Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa
1 2 3 4 1 1 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7
5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14
12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21
19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28
26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 27 28 29 30 25 26 27 28 29 30 31 29 30
30 31
July August September October November December
Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa
1 2 3 4 5 1 2 1 2 3 4 5 6 1 2 3 4 1 1 2 3 4 5 6
6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13
13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20
20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27
27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31
31 30
J
Solution: <lang j>require 'dates format' NB. J6.x require 'dates general/misc/format' NB. J7.x calBody=: (1 1 }. _1 _1 }. ":)@(-@(<.@%&22)@[ ]\ calendar@]) calTitle=: (<: - 22&|)@[ center '[Insert Snoopy here]' , ,:~ ":@] formatCalendar=: calTitle , calBody</lang> Example use: <lang j> 132 formatCalendar 1969
[Insert Snoopy here]
1969
Jan │ Feb │ Mar │ Apr │ May │ Jun
Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa
1 2 3 4│ 1│ 1│ 1 2 3 4 5│ 1 2 3│ 1 2 3 4 5 6 7
5 6 7 8 9 10 11│ 2 3 4 5 6 7 8│ 2 3 4 5 6 7 8│ 6 7 8 9 10 11 12│ 4 5 6 7 8 9 10│ 8 9 10 11 12 13 14
12 13 14 15 16 17 18│ 9 10 11 12 13 14 15│ 9 10 11 12 13 14 15│ 13 14 15 16 17 18 19│ 11 12 13 14 15 16 17│ 15 16 17 18 19 20 21
19 20 21 22 23 24 25│ 16 17 18 19 20 21 22│ 16 17 18 19 20 21 22│ 20 21 22 23 24 25 26│ 18 19 20 21 22 23 24│ 22 23 24 25 26 27 28
26 27 28 29 30 31 │ 23 24 25 26 27 28 │ 23 24 25 26 27 28 29│ 27 28 29 30 │ 25 26 27 28 29 30 31│ 29 30
│ │ 30 31 │ │ │
─────────────────────┼─────────────────────┼─────────────────────┼─────────────────────┼─────────────────────┼─────────────────────
Jul │ Aug │ Sep │ Oct │ Nov │ Dec
Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa
1 2 3 4 5│ 1 2│ 1 2 3 4 5 6│ 1 2 3 4│ 1│ 1 2 3 4 5 6
6 7 8 9 10 11 12│ 3 4 5 6 7 8 9│ 7 8 9 10 11 12 13│ 5 6 7 8 9 10 11│ 2 3 4 5 6 7 8│ 7 8 9 10 11 12 13
13 14 15 16 17 18 19│ 10 11 12 13 14 15 16│ 14 15 16 17 18 19 20│ 12 13 14 15 16 17 18│ 9 10 11 12 13 14 15│ 14 15 16 17 18 19 20
20 21 22 23 24 25 26│ 17 18 19 20 21 22 23│ 21 22 23 24 25 26 27│ 19 20 21 22 23 24 25│ 16 17 18 19 20 21 22│ 21 22 23 24 25 26 27
27 28 29 30 31 │ 24 25 26 27 28 29 30│ 28 29 30 │ 26 27 28 29 30 31 │ 23 24 25 26 27 28 29│ 28 29 30 31
│ 31 │ │ │ 30 │ </lang>
Python
The Python calendar.pryear function prints calendars with the following formatting options: optional parameters w, l, and c are for date column width, lines per week, and number of spaces between month columns, respectively.
Although rumoured to be getting an anti-gravity module, Python as yet does not include a snoopy module ;-) <lang python>>>> import calendar >>> help(calendar.prcal) Help on method pryear in module calendar:
pryear(self, theyear, w=0, l=0, c=6, m=3) method of calendar.TextCalendar instance
Print a years calendar.
>>> prcal(1969, m=4)
1969
January February March April
Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su
1 2 3 4 5 1 2 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 3 4 5 6 7 8 9 7 8 9 10 11 12 13
13 14 15 16 17 18 19 10 11 12 13 14 15 16 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 24 25 26 27 28 29 30 28 29 30
31
May June July August
Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su
1 2 3 4 1 1 2 3 4 5 6 1 2 3 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 4 5 6 7 8 9 10
12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 11 12 13 14 15 16 17 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 18 19 20 21 22 23 24 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 25 26 27 28 29 30 31
30
September October November December
Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su
1 2 3 4 5 6 7 1 2 3 4 5 1 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 6 7 8 9 10 11 12 3 4 5 6 7 8 9 8 9 10 11 12 13 14
15 16 17 18 19 20 21 13 14 15 16 17 18 19 10 11 12 13 14 15 16 15 16 17 18 19 20 21 22 23 24 25 26 27 28 20 21 22 23 24 25 26 17 18 19 20 21 22 23 22 23 24 25 26 27 28 29 30 27 28 29 30 31 24 25 26 27 28 29 30 29 30 31
>>> </lang>