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cal

The calendar utility.

About

cal is a command which produces calendars.

$ cal
   September 2013
Su Mo Tu We Th Fr Sa
 1  2  3  4  5  6  7
 8  9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30

cal has many options.

usage: cal [-jy] [[month] year]
   cal [-j] [-m month] [year]
   ncal [-Jjpwy] [-s country_code] [[month] year]
   ncal [-Jeo] [year]

Mission

Your mission, if you wish to accept it, is to write a simplified version of the cal command.

To start off, do not accept any command-line arguments. Simply display an ASCII calendar of the current month. Keep it simple, and try to make your output match the correct output displayed above.

You may use any language you'd like, but please don't just exec(cal) and print the result!

Extended

If that's too easy for you, accept two extra options: the month and year.

$ cal 7 1992
     July 1992
Su Mo Tu We Th Fr Sa
          1  2  3  4
 5  6  7  8  9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30 31

Skills Required

  • Date/Time operations
  • String formatting
  • Modular arithmetic

Good luck! We're all counting on you.

by Jordan Scales (http://jordanscales.com). Stevens Open Source Society, Fall 2013.