Question

Design a class called NumDays. The class’ purpose is to store a value that represents a number of work hours and convert it to a number of days. For example, 8 hours would be converted to 1 day, 12 hours would be converted to 1.5 days, and 18 hours would be converted to 2.25 days. The class should have a constructor that accepts a number of hours, 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 the sum of the two objects’ hours members.

- Subtraction operator. When one NumDays object is subtracted from another, the overloaded - operator should return the difference of the two objects’ hours members.

++ Prefix and postfix increment operators. These operators should increment the number of hours stored in the object. When, incremented, the number of days should be automatically recalculated.

-- Prefix and postfix decrement operators. These operators should decrement the number of hours stored in the object. When, decremented, the number of days should be automatically recalculated.

Write a program in C++ to demonstrate the NumDays class: create several objects, use their member functions and overloaded operators. Make sure to display (print) the before and after results.

Answer 1

#include <iostream>

#include <string>

using namespace std;

class NumDays

{

private :

int days;

int hrs;

public:

NumDays(int hrs)

{

this->hrs=hrs;

}

int getHrs()

{

return hrs;

}

void setHrs(int hrs)

{

this->hrs=hrs;

}

float getDays()

{

return hrs/8.0;

}

NumDays operator+(NumDays n)

{

NumDays nd(hrs+n.getHrs());

return nd;

}

NumDays operator-(NumDays n)

{

NumDays nd(hrs-n.getHrs());

return nd;

}

// Post-increment Operator

NumDays operator++()

{

hrs++;

return *this;

}

// Post-decrement Operator

NumDays operator--()

{

hrs--;

return *this;

}

// Pre-increment Operator

NumDays operator++(int)

{

NumDays old(*this);

++(*this);

return old;

}

// Pre-decrement Operator

NumDays operator--(int)

{

NumDays old(*this);

--(*this);

return old;

}

};

int main ()

{

NumDays n1(8),n2(12),n3(18);

cout<<"After converting "<<n1.getHrs()<<" hrs to days is "<<n1.getDays()<<endl;

cout<<"After converting "<<n2.getHrs()<<" hrs to days is "<<n2.getDays()<<endl;

cout<<"After converting "<<n3.getHrs()<<" hrs to days is "<<n3.getDays()<<endl;

cout<<"No of Hrs in n1 Before PostIncrement "<<n1.getHrs()<<endl;

n1++;

cout<<"No of Hrs in n1 After PostIncrement "<<n1.getHrs()<<endl;

cout<<"No of Hrs in n2 Before PostDecrement "<<n2.getHrs()<<endl;

n2--;

cout<<"No of Hrs in n2 After PostDecrement "<<n2.getHrs()<<endl;

cout<<"No of Hrs in n2 Before PreIncrement "<<n2.getHrs()<<endl;

++n2;

cout<<"No of Hrs in n2 After PreIncrement "<<n2.getHrs()<<endl;

cout<<"No of Hrs in n3 Before PreDecrement "<<n3.getHrs()<<endl;

--n3;

cout<<"No of Hrs in n3 After PreDecrement "<<n3.getHrs()<<endl;

NumDays n4=n1+n2;

cout<<" No of Hrs after adding n1 and n2 is "<<n4.getHrs()<<endl;

cout<<" No of Days in n4 is "<<n4.getDays()<<endl;

NumDays n5=n3-n1;

cout<<" No of Hrs after subtracting n1 from n3 is "<<n5.getHrs()<<endl;

cout<<" No of Days in n5 is "<<n5.getDays()<<endl;

return 0;

}

__________________

Output:

___________Thank You