Question

c++

1. Although our Date class has the advance_day( ) function (default is 1 day), programmers new to the project want to be able to just ++ a Date object instead of calling the method. Overload operator ++ to increment the day of a Date object by one. Show both pre- and post-fix forms.

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2. Rather than use traditional accessors/mutators, you decide to use operator [ ] for your 2D Point class. Don't forget your error checking! (Hint: How many overloads are there again?)

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3.

Given the following enumeration:

    enum Fruit { apple, orange, grapes };

Overload operator << to print one of its values to an output stream.

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Answer 1

(1)

#include<iostream>
using namespace std;

class Date{
   int month;
   int day;
   int year;
  
public:
   //pre increament
   Date operator ++(){
       int days_in_month[]={0,31,28,31,30,31,30,31,31,30,31,30,31};
      
       if(year% 4 ==0 && year%100 != 0 || year%400 == 0)days_in_month[2] = 29;
       else days_in_month[2] = 28;
      
       day++;
       if(day>days_in_month[month]){
           if(month==12)year+=1;
              
           day=1;
           month%=12;
           month+=1;  
       }
       return *this;
   }
  
   //Post increment
   Date operator ++(int){
       int days_in_month[]={0,31,28,31,30,31,30,31,31,30,31,30,31};
       Date date;
      
       if(year% 4 ==0 && year%100 != 0 || year%400 == 0)days_in_month[2] = 29;
       else days_in_month[2] = 28;
      
       date.day = day;
       date.month = month;
       date.year = year;
      
       day++;
       if(day>days_in_month[month]){
           if(month==12)year+=1;
              
           day=1;
           month%=12;
           month+=1;  
       }
       return date;
   }
  
};

(3)

enum Fruit { apple, orange, grapes };
ostream & operator << (ostream& out , const enum Fruit fruit){
   if(fruit == apple){
       out<<"apple";
   }
   else if(fruit == orange){
       out<<"orange";
   }
       else if(fruit == grapes){
       out<<"grapes";
   }
   return out;
}