How do i...solve operator overloading

Question

1.00/5 (1 vote)

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1. Write a Date class that has following functionality
▪ A parameterized constructor
▪ IsValid() that checks if the date is valid or not
▪ ShowDate()
▪ GetDate()

Define following overloaded operators for this class: 
▪ (>, <, <=, ==, !=) compares two dates and returns a Boolean value
▪
- operator that calculates the number of days between two dates 
▪ ++ (postfix) increments date by a day
▪ -- (prefix) decrements date by a day

What I have tried:

C++

class date
{
private:
	int day;
	int month;
	int year;
public:
bool isvalid()const;
bool date::isvalid()const
{
	if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
	{
		if (day >= 1 && day <= 31)
		{
			return true;
		}
		else
		{
			return false;
		}
	}
	else if (month == 4 || month == 6 || month == 9 || month == 11)
	{
		if (day >= 1 && day <= 30)
		{
			return true;
		}
		else
		{
			return false;
		}
	}
	else if (month == 2)
	{
		if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))
		{
			if (day >= 1 && day <= 29)
			{
				return true;
			}
			else
			{
				return false;
			}
		}
		else
		{
			if (day >= 1 && day <= 28)
			{
				return true;
			}
			else
			{
				return false;
			}
		}
	}
	else
	{
		return false;
	}
}

Posted 17-Dec-20 2:09am

Member 15023693

Updated 18-Dec-20 13:44pm

CPallini

v2

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Comments

KarstenK 17-Dec-20 10:21am

you can optimize the code by checking at first for 28, 29 (in february), 30 and 31 days.

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Richard MacCutchan · Answer 1 · 2020-12-17T02:30:00

Solution 1

Operator Overloading | Microsoft Docs[^]

Posted 17-Dec-20 2:30am

Richard MacCutchan

Comments

CPallini 17-Dec-20 9:15am

5.

CPallini · Answer 2 · 2020-12-17T03:20:00

In addition Richard's answer. I'm going to show you how to implement the constructor and the overloading of the < operator. The remaining stuff is up to you.

C++

#include <iostream>
#include <memory>
using namespace std;
class Date
{
  int day, month, year;
public:
  Date ( int day, int month, int  year): day(day), month(month), year(year){}
  friend bool operator < ( const Date & da, const Date & db);
  //...
};


bool operator < ( const Date & da, const Date & db)
{
  if ( da.year == db.year)
  {
    if ( da.month == db.month)
    {
      return (da.day < db.day);
    }
    // here da.month != db.month
    return ( da.month < db.month);
  }
  // here da.year != db.year
  return (da.year < db.year);
}

Please note:

You mispelled the isValid method name.
In the isValid implementation you missed to check the correctness of both the year and the month values.

steveb · Answer 3 · 2020-12-18T13:44:00

You need to convert your year, month, and day into number of days, then all your operators will be one line of code.
Of course if you track the hours minutes and seconds it will have to be converted to the lowest denominator i.e. if you include hours then everything must be converted to hours and so on

How do i...solve operator overloading

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