Algorithms and Programming

Assignment 1

(Due on Monday 21st August 2017).

This assignment is to implement a simple version of the Unix "cal"
program. You will have to take a month and year from the user (both as
numbers), and print out the calendar for that month of that year. For
example if the user inputs "8" and "2017" for month and year
respectively, then you should print out:

        August 2017       
    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      

(This is the output of the command

  $ cal 8 2017

in Linux.)

You may take Wed, 1st Jan 1800, to be the "anchor" date, and assume
that the year entered by the user is at least 1800. 

To do this, you need to write the following functions:

(a) int leap(int y), which returns 1 or 0 depending on whether year
"y" is a leap year or not.

(b) int validdate(int d, int m, int y), which returns 1 or 0 depending on
whether the given date is valid.

(c) int daysgoneby(int y), which returns the number of days since
01-01-1800, up to (but not including) the year "y".

(d) int doy(int m, int d, int y), which returns the day of the year
(between 1 and 366) that the date m-d-y fall on.

(e) a function void print(int m, int y), which prints out the calendar
for month "m" of year "y".

(f) a "main" function which takes input from the user, and calls these
functions to produce the required program.