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B Smith: Class required 30 to 40 minutes to do. More practice needed. Case Study. Math 130 Lecture # 34. Overview. Class Implementation. M130 Pop Quiz Friday, May 13, 2005 (Not collected for grade.) Implement the functions for the following Date class. class Date { private:

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Case study

B Smith:

Class required 30 to 40 minutes to do. More practice needed

Case Study

Math 130Lecture # 34


Overview

Overview


Class implementation

Class Implementation

M130 Pop Quiz

Friday, May 13, 2005

(Not collected for grade.)

Implement the functions for the following Date class.

class Date

{

private:

int _month;

int _day;

int _year;

public:

Date(int = 7, int =4, int = 2001); // constructor

int equals( Date& ); //test for equality

void getDate(void); //member function to display a date

};


Implementations

B Smith:

Better practice is to use (const Date& d) to avoid sending a complete object, but simply an invariant object reference. Also, if we send Date d as a parameter, the copy constructor will get called!

Implementations

Date::Date(int m, int d, int y)

{

_month = m;

_day = d;

_year = y;

}

bool Date::equals(Date& d)

{ bool eq = false;

if (_month == d._month && _day == d._day && _year == d._year)

eq = true;

return eq;

}

void Date::getDate()

{

cout << "month = " << _month << "\nday = "

<< _day << "\nyear = " << _year << endl;

}


Driver code

B Smith:

Also, discuss how we could overload the “=“ operator.

Driver Code

int main()

{

Date a(7,4,1776), b, c(7,4,2001);

cout << "\na: " << endl;

a.getDate();

cout << "\nb: " << endl;

b.getDate();

cout << "\nc: " << endl;

c.getDate();

if(a.equals(b)) cout << "a == b" << endl;

if(!a.equals(b)) cout << "a != b" << endl;

if(b.equals(c)) cout << "a == c" << endl;

system("pause");

return 0;

}


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