Not returning how many days are in the month

dorklowski (6)
When I use my switch function to try and return the number of days in a given month I don't see anything.

If I enter a invalid month number I do see it say Invalid, not sure why I can't see it return the number of days though.

Thanks for looking at it.

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#include <iostream>
using namespace std;

class date
{
	public:
		void setDate(int m, int d, int y);
		int daysOfMonths(int m, int y);
		void printDate() const;
		void printLongDate() const;
		bool leapYear(int y) const;
		bool dateValidation();
		date (int m = 1, int d = 1, int y = 1990);
	private:
		int month;
		int day;
		int year;
		int days;
};

int main()
{
	date calendar;
	int m1, d1, y1;

	cout << "Please enter a date: ";
	cin >> m1 >> d1 >> y1;

	calendar.setDate(m1, d1, y1);

    calendar.leapYear(y1);

	calendar.dateValidation();

	calendar.printDate();
	calendar.printLongDate();

	cout << "Days in the month: ";
	calendar.daysOfMonths(m1, y1);

	// your code goes here
	return 0;
}

//Class Object that sets the date
void date::setDate(int m, int d, int y)
{

   	if (m >= 1 && m <= 12)
		month = m;
	else
		month = 1;

	if (d >= 1 && d <= 31)
		day = d;
	else
		day = 1;

    if (y >= 1582)
		year = y;
	else
		year = 1990;

}

int date::daysOfMonths(int m, int y)
{
    switch (m)
    {
        case 1:
        case 3:
        case 5:
        case 7:
        case 8:
        case 10:
        case 12:
            days = 31;
            return days;
            break;
        case 4:
        case 6:
        case 9:
        case 11:
            days = 30;
            return days;
            break;
        case 2:
            if(leapYear(y))
            {
                days = 28;
                return days;
            }
            else
                days = 29;
                return days;
            break;
        default:
            cout << "Invalid." << endl;
            break;
    }
}

bool date::leapYear(int y) const
{
	bool leapYear = (y % 4 == 0 && y % 100 !=0) || (y % 400 == 0);

   	if(leapYear)
   		return true;
   	else
   		return false;
}

bool date::dateValidation()
{
  if (! (1 >= month && month<=12) )
     return false;
  if (! (1<= day && day<=31) )
     return false;
  if ( (day==31) && (month==2 || month==4 || month==6 || month==9 || month==11) )
     return false;
  if ( (day==30) && (month==2) )
     return false;
  if ( (month==2) && (day==29) && (year%4!=0) )
     return false;
  if ( (month==2) && (day==29) && (year%400==0) )
     return true;
  if ( (month==2) && (day==29) && (year%100==0) )
     return false;
  if ( (month==2) && (day==29) && (year%4==0)  )
     return true;


}

//Class Object that prints
void date::printDate() const
{
	if(month <= 9 && day <= 9)
		cout << "The date you entered is: " << "0" << month << "-" << "0" << day << "-" << year;
	else if (month <= 9 && day >= 9)
		cout << "The date you entered is: " << "0" << month << "-" << day << "-" << year;
	else if (month >= 10 && day <=9)
		cout << "The date you entered is: " << month << "-0"  << day << "-" << year;
	else
	cout << "The date you entered is: " << month << "-" << day << "-" << year;
	cout << endl;

}

void date::printLongDate() const
{
    cout << "You have entered ";
    if(month <= 1)
        cout << "January " << day << ", " << year;
    else if(month <= 2)
        cout << "February " << day << ", " << year;
    else if(month == 3)
        cout << "March " << day << ", " << year;
    else if(month == 4)
        cout << "April " << day << ", " << year;
    else if(month == 5)
        cout << "May " << day << ", " << year;
    else if(month == 6)
        cout << "June " << day << ", " << year;
    else if(month == 7)
        cout << "July " << day << ", " << year;
    else if(month == 8)
        cout << "August " << day << ", " << year;
    else if(month == 9)
        cout << "September " << day << ", " << year;
    else if(month == 10)
        cout << "October " << day << ", " << year;
    else if(month == 11)
        cout << "November " << day << ", " << year;
    else
        cout << "December " << day << ", " << year;
    cout << endl;
}

//Constructor with parameters
date::date (int m, int d, int y)
{
	month = m;
	day = d;
	year = y;
}
coder777 (8444)
Change line 38: cout << "Days in the month: " <<;
dorklowski (6)
Awesome, thanks a ton :)
Alrededor (166)
A few items:

1. What is the point of having the days member in your date class? It appears to only be used in int date::daysOfMonths(int m, int y). Every date object you instantiate will have its own days member. You do not even need to define a variable to hold the return value in daysOfMonths(). In the switch statement you can directly return the value in each case.

case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
return 31;
break;

Similarly for the other cases.

Also, you do not return a value in the default case. I'm surprised the compiler does not issue a warning about not all control paths returning a value. You could return zero as a code to show the month was invalid or even throw an exception.

2. In order to call the function: bool leapYear(int y) const;

you will need to instantiate a date object. But testing whether a particular year is a leap year has nothing to do with any particular date that has been instantiated. Instead you could make it a static member function. That way you can call it through any date object or through the scope resolution operator.

static bool leapYear(int y) const;

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2
 
date christmas(( 12, 25, 2015);
std::cout << christmas.leapYear( 2020 );


or

std::cout << date::leapYear(2020 );

3. If you eliminate your days member then you could also make your dayOfMonths function a static const member function.

static int daysOfMonths(int m, int y) const;
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