Assignment 8 - Constructing the World Population

The purpose of this assignment is to give you practice using constructors and destructors.

Update 11/13: The required size member was removed from the Human class.

Program Overview

The goal of this assignment is to create a partial model of a population system, simulating the aging and dying of a population.

Program Requirements

• Create the three classes described below.
• Use the main() function included below.
• Your output should look like that shown below.
• Use constructor initialization lists for all constructors.

Class Descriptions

• 3 unsigned int data members to represent month, day, and year
• a default constructor
• a constructor that takes 3 unsigned ints as arguments
• an increment function that adds 1 day to the Date.  The increment function will need to implement leap year logic.
• a print() function that displays the Date in the mm/dd/yyyy format
• a letTimePass() function that adds a random number of days to a Date.  The random number should be between 1 and 365.  You will be using this function to add days to the (global) Today Date.  Hint:  you might use the random number to call the increment() function repeatedly.
• A static data member, DaysPerYear.  It should be initialized to 365.25.
• A static array data member, DaysPerMonth.  It should be initialized to {0,31,28,31,30,31,30,31,31,30,31,30,31}.

• 3 data members:
• string   name
• Date     birthday
• bool     isAlive
• a constructor:    Human(const string& n, const Date& b)
• necessary accessor functions
• a function, age() that returns a Human’s age in years (you can assume that the year is 365.25 days in length)
• a die() function (you know what that means)
• a print() function

• A non-static data members:
• Human**   people
• A static data member, OriginalPopulationSize.  It should be initialized to 54.
• A default constructor
• A destructor
• A print() function
• An examinePopulation() function that takes a look at the population, calls the following rollTheDice() function for each “living” Human.  If the rollTheDice() function returns a number greater than .67, the Human should “die”.

Assumptions

• All humans were "born" on or after January 1, 1920.
• For the Date constructor with 3 unsigned int arguments between 0 and 99.  You may assume that if a year argument is greater than 20 then the year is between 1921 and 1999 and if the year argument is less than 21, then the year is between 2000 and 2020.
• You may use the following global variables in your solution:

The main() function

Program Output