Question

Design a class named NumDays, to store a value that represents a number of hours and convert it to a number of days. For example, 24 hours would be converted to 1 day, 36 hours would be converted to 1.5 days, and 54 hours would be converted to 2.25 days.

This class has two private member variables with data type double: one is named as hours; another is named as days.

This class has a constructor that accepts a value for the member variable hours (if not argument is sent, the default value is 0), as well as member functions for storing and retrieving the hours and days. The class should also have the following overloaded operators:

+ Addition operator. When two NumDays objects are added together, the overloaded + operator should return a new object under class NumDays. For this new object, its member variable hours should be the summary of the two existed objects’ hours members; its member variable days should be based on its member variable hours.

- Subtraction operator. When one NumDays object is subtracted from another, the overloaded -operator should return a new object under class NumDays. For this new object, its member variable hours should be the difference between the two objects’ hours members; its member variable days should be based on its member variable hours. (allow negative value for hours and days, e.g. hours = -48 and days = -2)

Please put NumDays class declaration and member functions’ definitions in one header file named NumDays.h

Define a main function in a source file named HW3.cpp to test the class.

In this main function, define 4 objects under class NumDays. These objects are named as one, two, three, four. When creating these objects, object one’s hours is initialized to 24; object two’s hours is initialized to 12; object three’s hours is initialized to 0 (default value); object four’ s hours is initialized to 0 (default value).

Then add object one and object two, and assign result to object three; subtract object two from object one, and assign result to object four.

At last, display values of days in object one, two, three, four respectively.

Answer 1

Note: Could you plz go through this code and let me know if u need any changes in this.Thank You
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// NumDays.h

#ifndef NUMDAYS_H
#define NUMDAYS_H

class NumDays
{
public:
NumDays(double hrs);
NumDays();

NumDays operator + ( NumDays &rhs );
NumDays operator - ( NumDays &rhs );
double getDays();

private:
// Declaring variables
double hours;
double days;
};
#endif

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// NumDays.cpp

#include <iostream>
using namespace std;
#include "NumDays.h"

NumDays::NumDays(double hrs)
{
this->hours=hrs;
}
NumDays::NumDays()
{
this->hours=0;   
}

NumDays NumDays::operator + ( NumDays &rhs )
{
double hrs=hours+rhs.hours;
NumDays n(hrs);
n.days=n.getDays();
return n;   
}
NumDays NumDays::operator - ( NumDays &rhs )
{
double hrs=this->hours-rhs.hours;
NumDays n(hrs);
n.days=n.getDays();
return n;
}

double NumDays::getDays()
{
return hours/24;
}

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// main.cpp

#include <iostream>
using namespace std;
#include "NumDays.h"

int main()
{
NumDays one(24);
NumDays two(12);
NumDays three(0);
NumDays four(0);
three=one+two;
four=one-two;
cout<<"No Of Days in Object#1"<<endl;
cout<<one.getDays()<<endl;
cout<<"No Of Days in Object#2"<<endl;
cout<<two.getDays()<<endl;
cout<<"No Of Days in Object#3"<<endl;
cout<<three.getDays()<<endl;
cout<<"No Of Days in Object#4"<<endl;
cout<<four.getDays()<<endl;
  
return 0;
}

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Output:

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