C++

Date Library and Application

Write an application to produce the following output (do this first):

Note: User is presented with a menu of four items: change date A, change date B, change number n or exit. Once the user inputs date A/B or n, the program shows the date arithmetics shown in the output.

Testing: Test your program thoroughly to make sure there are no bugs. Bugs you don't find will cost you (speaking from experience.)

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Date A: 02/01/1971

Date B: 01/01/1972

n: 10

[01/01/1972] - [02/01/1971] = 334

[02/01/1971] + [10] = 02/11/1971

[02/01/1971] - [10] = 01/22/1971

[A] [B] [N] [X] >> n

n: 10

Date A: 02/01/1971

Date B: 01/01/1972

n: 10

[01/01/1972] - [02/01/1971] = 334

[02/01/1971] + [10] = 02/11/1971

[02/01/1971] - [10] = 01/22/1971

[A] [B] [N] [X] >> b

: 1/1/80

Date A: 02/01/1971

Date B: 01/01/1980

n: 10

[01/01/1980] - [02/01/1971] = 3256

[02/01/1971] + [10] = 02/11/1971

[02/01/1971] - [10] = 01/22/1971

[A] [B] [N] [X] >> a

: 5/13/80

Date A: 05/13/1980

Date B: 01/01/1980

n: 10

[01/01/1980] - [05/13/1980] = -133

[05/13/1980] + [10] = 05/23/1980

[05/13/1980] - [10] = 05/03/1980

[A] [B] [N] [X] >> x

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Date Library:

Write the following functions to be used in this application or any application that may need date arithmetics.

Note:

* Date calculations envolve calculating the number of days between this date and the epoc (01/01/1970) This is a requirement.

* day_number: number of days since epoch

* year_number: number of days since epoch to Jan 1st of this year

* All day numbers are zero based, so 01/01/1970 is day 0 and 01/02/1970 is day 1

* avoid repeated code.

* Do a top/down design: Figure out what functions depend on which. Find out what functions are high level and what functions are low level

* Please check the correctness of your calculations (and indicate on the output that you have done so) using this or similar websites.

bool date_is_valid(int m, int d, int y); //true if m/d/y is valid

void date_input(int& m, int& d, int &y, //input a valid date with prompt

string prompt = ":");

void date_output(int m, int d, int y); //output mm/dd/yyy

void date_show(int m, int d, int y); //show all info about m/d/y

int date_day_number(int m, int d, int y); //days since epoch

int date_day_of_year(int m, int d, int y); //days since 01/01

int date_day_of_year_2_date(int days, //day of year -> m/d/y

int& m, int& d, int y);

void date_days_to_date(int days, //days since epoch -> m/d/y

int& m, int& d, int& y);

void date_add(int& m, int& d, int &y, int days); //date + n

int date_subtract(int end_m, int end_d, int end_y, //date - date

int start_m, int start_d, int start_y);

int date_days_in_month(int m, int y); //number of days in m/y

bool date_is_leap(int y); //true if y is a leap year

int year_size(int y); //365 or 366?

int num_of_leap_years(int y); //number of leap years since epoch

int year_number(int y); //#days from 01/01/1971 to 01/01/y