Question

Design a class named Month. The class should have the following private members:

   • name - A string object that holds the name of a month, such as "January", "February", etc.

   • monthNumber - An integer variable that holds the number of the month. For example, January would be 1, February would be 2, etc. Valid values for this variable are 1 through 12.  

In addition, provide the following member functions:

• A default constructor that sets monthNumber to 1 and name to "January."

• A constructor that accepts the name of the month as an argument. It should set name to the value passed as the argument and set monthNumber to the correct value.

• A constructor that accepts the number of the month as an argument. It should set monthNumber to the value passed as the argument and set name to the correct month name.

• Appropriate set and get functions for the name and monthNumber member variables.

• Prefix and postfix overloaded ++ operator functions that increment monthNumber and set name to the name of next month. If monthNumber is set to 12 when these functions execute, they should set monthNumber to 1 and name to "January".

• Prefix and postfix overloaded -- operator functions that decrement monthNumber and set name to the name of previous month. If monthNumber is set to 1 when these functions execute, they should set monthNumber to 12 and name to "December".  

• Make operator overloading for asigning (=) an object to another.

• Overload the comparetor operators ==, > and <.

Also, you should overload cout's << operator and cin's >> operator to work with the Month class. Demonstrate the class in a program (main.cpp).

Answer 1

//Month class
#ifndef MONTH_H
#define MONTH_H
#include
#include
using namespace std;
class Month
{
private:
   string name;
   int monthNumber;
public:
   Month() ;
   Month(string) ;
   Month(int x) ;
   void setName(string month_pointer) ;
   void setNumber(int x) ;
   string getName() ;
   int getNumber() ;
   Month operator++() ;
   Month operator++(int) ;
   Month operator--() ;
   Month operator--(int) ;
  
   friend ostream &operator << (ostream &strm, Month &obj) ;
   friend istream &operator >> (istream &strm, Month &obj) ;

};
#endif

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//Month.cpp
//include header files
#include
#include
//include Month.h
#include "Month.h"
using namespace std;
Month::Month()
{
   monthNumber = 1;
   name = "January";
}
Month::Month(string monthName)
{
   setName(monthName);
}
Month::Month(int x)
{
   setNumber(x);
}
   void Month::setName(string month_pointer)
   {
       name = month_pointer;
   if (month_pointer == "January")
       monthNumber = 1;
   else if(month_pointer == "February")
       monthNumber = 2;
   else if(month_pointer == "March")
       monthNumber = 3;
   else if(month_pointer == "April")
       monthNumber = 4;
   else if(month_pointer == "May")
       monthNumber = 5;
   else if(month_pointer == "June")
       monthNumber = 6;
   else if(strcmp(month_pointer.c_str(),"July")==0)
       monthNumber = 7;
   else if(month_pointer == "August")
       monthNumber = 8;
   else if(month_pointer == "September")
       monthNumber = 9;
   else if(month_pointer == "October")
       monthNumber = 10;
   else if(month_pointer == "November")
       monthNumber = 11;
   else if(month_pointer == "December")
       monthNumber = 12;
   }
   void Month::setNumber(int x)
   {
       monthNumber = x;
   switch (monthNumber)
   {
   case 1:
       name = "January";
       break;
   case 2:
       name = "February";
       break;
   case 3:
       name = "March";
       break;
   case 4:
       name = "April";
       break;
   case 5:
       name = "May";
       break;
   case 6:
       name = "June";
       break;
   case 7:
       name = "July";
       break;
   case 8:
       name = "August";
       break;
   case 9:
       name = "September";
       break;
   case 10:
       name = "October";
       break;
   case 11:
       name = "November";
       break;
   case 12:
       name = "December";
       break;
   }
   }
   string Month::getName()
   {
       return name;
   }
   int Month::getNumber()
   {
       return monthNumber;
   }
   Month Month::operator++()
   {
       Month temp(monthNumber);
       ++monthNumber;
       if(monthNumber == 13)
           monthNumber = 1;
       temp.setNumber(monthNumber);      
       name=temp.getName();
       return temp;
   }
   Month Month::operator++(int)
   {
       Month temp(monthNumber);
       monthNumber++;

       if(monthNumber == 13)
           monthNumber = 1;

       temp.setNumber(monthNumber);
      
       name=temp.getName();
      
       return *this;
   }
   Month Month::operator--()
   {
       Month temp(monthNumber);
       --monthNumber;
       if(monthNumber == 0)
           monthNumber = 12;
       temp.setNumber(monthNumber);      
       name=temp.getName();
       return *this;
   }
   Month Month::operator--(int)
   {
       Month temp(monthNumber);
       monthNumber--;
       if(monthNumber == 0)
           monthNumber = 12;
       temp.setNumber(monthNumber);      
       name=temp.getName();
       return temp;
   }
ostream &operator << (ostream &strm, Month &obj)
{
   strm << obj.getNumber() << " is the number of the month." << endl;
   strm << obj.getName() << " is the name of the month." << endl;
   return strm;
}
istream &operator >> (istream &strm, Month &obj)
{
   int x;
   cout << "Enter the month number: ";
   strm >> x;
   obj.setNumber(x);
   return strm;
}

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// Month class tester
//iclude header files
#include
#include
//include Month.h
#include "Month.h"
using namespace std;
int main()
{
   // Create a Month object
   Month m("April");
   cout << m.getName() << endl;
   cout << m.getNumber() << endl << endl;
   m.setName("December");
   cout << m.getName() << endl;
   cout << m.getNumber() << endl << endl;
   m.setNumber(2);
   cout << m.getName() << endl;
   cout << m.getNumber() << endl << endl;;
  
   cout<<"Incrementing the month number"<    //pre incrementing m object
   cout << ++m << endl;  
   cout<<"Incrementing the month number"<    //post incrementing m object
   cout << m++ << endl;
   cout << m << endl << endl;
   // pre decrement operator
   cout << --m << endl;
   //post decrement operator
   cout << m-- << endl;
   cout << m << endl << endl;

   system("pause");
   return 0;
}

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Sample output: