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Classes and Data Abstraction Assignment

mysiarobin1987 (40)
I need help with my assignment for class. Please note I am not asking anyone to do the work for me, just asking for hints. Here is the assignment:

Design and implement a class dayType that implements the day of the week in a program. The class dayType should store the day, such as Sunday for Sunday. The program should be able to perform the following operations on an object of type dayType:

Step a: Set the day.
Step b: Print the day.
Step c: Return the day.
Step d: Return the next day.
Step e: Return the previous day.
Step f: Calculate and return the day by adding certain days to the current day. For example, if the current day is Monday and we add 4 days, the day to be returned is Friday. Similarly, if today is Tuesday and we add 13 days, the day to be returned is Monday.
Step g: Add the appropriate constructors.
Write the definitions of the functions to implement the operations for the class dayType.

I need help with the addDay function. I am using an online learning tool my professor uses called MindTap. MindTap is very picky, and even though the code works, it still says the test has failed to add 3 days to Friday and 4 days to Monday. MindTap wants me to make the addDay function a void function. Any suggestions to how to make the function work as a void function? 

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//dayType.cpp
#include <iostream>
#include <string>

#include "dayType.h"

using namespace std;

// array for days of the week
string weekDays[7] = {"Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"};
// part b
void dayType::print() const
{
cout << weekDay;
}

// part d
string dayType::nextDay() const 
{
string nextDay;
if (weekDay == "Monday")
    nextDay = "Tuesday";
if (weekDay == "Tuesday")
    nextDay = "Wednesday";
if (weekDay == "Wednesday")
    nextDay = "Thursday";
if (weekDay == "Thursday")
    nextDay = "Friday";
if (weekDay == "Friday")
    nextDay = "Saturday";
if (weekDay == "Saturday")
    nextDay = "Sunday";
if (weekDay == "Sunday")
    nextDay = "Monday";
    return nextDay;
}

// part e
string dayType::prevDay() const 
{
string prevDay;
if (weekDay == "Monday")
    prevDay = "Sunday";
if (weekDay == "Tuesday")
    prevDay = "Monday";
if (weekDay == "Wednesday")
    prevDay = "Tuesday";
if (weekDay == "Thursday")
    prevDay = "Wednesday";
if (weekDay == "Friday")
    prevDay = "Thursday";
if (weekDay == "Saturday")
    prevDay = "Friday";
if (weekDay == "Sunday")
    prevDay = "Saturday";
    return prevDay;
}

// part f - I NEED HELP WITH THIS FUNCTION
string dayType::addDay(int nDays)
{
string weekDays[] = {"Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"};
	int index;

for(int i = 0; i < 7; i++)
{
   if (weekDay == weekDays[i])
   {
       index = i;
       break;
   }
}
return  weekDays[ (index + nDays) % 7 ];  
}

// part a
void dayType::setDay(string d)
{
string weekDays[7] = {"Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"};
if (d == "Monday")
    weekDay = weekDays[0];
if (d == "Tuesday")
    weekDay = weekDays[1];
if (d == "Wednesday")
    weekDay = weekDays[2];
if (d == "Thursday")
    weekDay = weekDays[3];
if (d == "Friday")
    weekDay = weekDays[4];
if (d == "Saturday")
    weekDay = weekDays[5];
if (d == "Sunday")
    weekDay = weekDays[6];
}

// part c
string dayType::getDay() const 
{
return weekDay;
}

// part g
dayType::dayType() 
{
weekDay = "Sunday";
}

// part g
dayType::dayType(string d) 
{
setDay(d);
}

//dayType.h
#ifndef H_dayType 
#define H_dayType
 
#include <string>  

using namespace std;

class dayType
{
public:
    static string weekDays[7];
    void print() const;
    string nextDay() const;
    string prevDay() const;
    string addDay(int nDays);
    void setDay(string d);
    string getDay() const;

    dayType();
    dayType(string d);

private:
    string weekDay;
};

#endif

//main.cpp
#include <iostream>
#include <string>
  
#include "dayType.h" 
 
using namespace std;

int main() 
{
    dayType myDay("Monday");
    dayType temp("Sunday");
    dayType myDay2("Friday");

    myDay.print();
    
    cout << endl;

    cout << myDay.prevDay() << endl;

    cout << myDay.nextDay() << endl;
    
    cout << endl;
    
    temp.print();
    
    cout << endl;

    cout << temp.prevDay() << endl;

    cout << temp.nextDay() << endl;
    
    cout << endl;
    
    cout << myDay2.addDay(3) <<endl;
    
    cout << myDay.addDay(4) << endl;

    return 0;
}
jonnin (11442)
a void adder might look like

void addto(type &in, type &value)
{
in += value;
}

or

void addtwo(type &result, type &value1, type &value2)
{
result = value1+value2;
}

...
as for adding up days, this begs using a modulus function and an enum
enum days{su,mo,tu,wd,th,fr,sa,max_days};

someday = (someday+ numdays) % max_days;
becomes, for fr + 4
fr = 5.
5 + 4 = 9.
max days is 7.
9 % 7 is 2.
2 is tu.
fr, sat(+1), su(+2), mo(+3), tu(+4) right?

something like that?


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