Due: Friday, 12/7/2001 Midnight

For this assignment, you will write a program a C++ program that works with dates. The C and Java versions of this code were discussed in class and are available on the webpage.

You must submit three sources files: date.h, date.C, and date_main.C. The header file, date.h, will contain the Date class declaration, which includes the instance variables and function prototypes. date.C should provide function definitions, both public and private, for the Date class. Finally, date_main.C is the driver for the program. You may want to name your executable dt to avoid conflict with the Unix date command.

As in the C and Java versions, your Date class must provide the following functions:

bool equals (Date date);

bool lessThan (Date date);

void format (char *str);

void nextDay (void);

bool leapYear (void);

int monthLength (int month, bool leap);

char *monthStr (void);

Note that these C++ prototypes are slightly different than in either of the provided programs; however, most of the code in the definitions of these functions will remain the same. Designate the above functions with the proper visibility: public or private.

Additionally, you must provide two constructors:

Date (void);

Date (int day, int month, int year);

that work similarly to init_date_1 () and init_date () in date.c, and the two Date constructors in Date.java, respsectively.

To give you some experience with working with operator overloading, you must also provide the following operators in the Date class:

bool operator== (Date date);

bool operator< (Date date);

bool operator> (Date date);

Date operator++ (int dummy);

where the comparators correspond directly to their meanings with integers, and ++ means "add a day." Keep in mind that you already have code that will implement these functions, so the code for these operators may simply contain a call to their corresponding function.

In date_main.C, define three variables as follows:

Date d1 = Date ();

Date d2;

Date *d3;

Add an initialization for d2 in the declaration line above that calls the other Date constructor with the values for December 31, 1999 (as in date.c and date.java). Initialize d3 with new and the Date constructor with values for January 1, 2000.

Follow the exact same steps for printing out the variables, incrementing d2, and comparing d2 and d3 as in date.c and date.java. Use cout for printing to the screen and add some tags and blank lines to make the output more readable. Finally add lines that will perform the following:

increment d2 using ++

get the format string for d2

print the format string

print "d2 < d3? "

compare d2 and d3 using the < operator

print "true" or "false" as before

print "d2 == d3? "

compare d2 and d3 using the == operator

print "true" or "false" as before

print "d2 > d3? "

compare d2 and d3 using the > operator

print "true" or "false" as before

Your final output should look like this:

d1: January 1, 1

d2: December 31, 1999

d3: January 1, 2000

d2 < d3? true

d2: January 1, 2000

d2 == d3? true

d2: January 2, 2000

d2 < d3? false

d2 == d3? false

d2 > d3? true