Question

The class dateType is designed to implement the date in a program, but the member function setDate and the constructor do not check whether the date is valid before storing the date in the data members. Rewrite the definitions of the function setDate and the constructor so that the values for the month, day, and the year are checked before storing the date into the data members. Add a function member, isLeapYear, to check whether a year is a leap year. Moreover, write a test program to test your class.

*Note: I need help to write out this problem in C++ while using Visual Studio 2017

//code

#include <iomanip>
#include <iostream>

class dateType
{
public:
   //custom methods
   void printDate() const;

   //mutators
   void setDate(int month, int day, int year);

   //accessors
   int getDay() const;
   int getMonth() const;
   int getYear() const;

   //constructors
   dateType(int month = 1, int day = 1, int year = 1900);

   //destructor
   ~dateType();
private:
   int dMonth;
   int dDay;
   int dYear;
};

int main()
{

}

//custom methods
void dateType::printDate() const
{
   cout << setfill('0');
   cout << setw(2) << dMonth << '-' << setw(2) << dDay << '-' << dYear;

}

dateType::dateType(int month, int day, int year)
{
   dMonth = month;
   dDay = day;
   dYear = year;
}

dateType::~dateType()
{
   dMonth = 1;
   dDay = 1;
   dYear = 1900;
}

Answer 1

The c++ code for your assignment is given below. All the methods have been defined to validate date and to check leap year.

*******************************date.cpp*****************************

#include <iomanip>
#include <iostream>
using namespace std;
class dateType
{
public:

   bool isLeapYear(int year);

   bool validateDate(int month,int day,int year);

//custom methods
void printDate() const;

//mutators
void setDate(int month, int day, int year);

//accessors
int getDay() const;
int getMonth() const;
int getYear() const;

//constructors
dateType(int month = 1, int day = 1, int year = 1900);

//destructor
~dateType();
private:
int dMonth;
int dDay;
int dYear;
};

int main()
{
   //this main function tests all methods

   //creating object with invalid date
   dateType d(2,29,2014);
   d.printDate();

   //set new date
   d.setDate(2,29,2016);
   d.printDate();
  
d.setDate(2,29,2017);
   d.printDate();
  
d.setDate(13,32,2016);
   d.printDate();
d.setDate(12,31,2018);
   d.printDate();
  
d.setDate(11,31,2018);
   d.printDate();
}

//custom methods
void dateType::printDate() const
{
cout << setfill('0');
cout << setw(2) << dMonth << '-' << setw(2) << dDay << '-' << dYear;

}

dateType::dateType(int month, int day, int year)
{
   if(validateDate(month,day,year)){
dMonth = month;
dDay = day;
dYear = year;
}
   else{
       cout<<month<<"-"<<day<<"-"<<year<<" is invalid date. So setting default date to 1/1/1900"<<endl;
       dMonth = 1;
       dDay = 1;
       dYear = 1900;
   }
}
//set date
void dateType::setDate(int m,int d, int y){
   if(validateDate(m,d,y)){

   dMonth = m;
   dDay = d;
   dYear = y;
   cout<<"\nDate Set.."<<endl;
   }
       else{
cout<<endl;
           cout<<m<<"-"<<d<<"-"<<y<<" is invalid date. Can't set it"<<endl;
       }
}
//check if leap year
bool dateType::isLeapYear(int y){

   return ((( y% 4 == 0) && (y % 100 != 0)) ||(y % 400 == 0));
   }
//validate date
bool dateType::validateDate(int m,int d,int y){
   if(m>12 || m<1 || y<1900){
       return false;
   }
   if(m==2){
       if(this->isLeapYear(y)){
           if(d<=29)
               return true;
           else
               return false;
       }
       else{
           if(d<=28)
               return true;
           else
               return false;
       }
   }
   else{
       if(m==4||m==6||m==9||m==11){
           if(d<=30)
               return true;
           else
               return false;
       }
       else{
           if(d<=31)
               return true;
           else
               return false;
       }
   }
}

dateType::~dateType()
{
dMonth = 1;
dDay = 1;
dYear = 1900;
}