Hey so its a simple program it is an array of the whole week. and they’re is 2 functions really that’s next day and prep day. I don’t understand why my out put is wrong. its weird because in the first variable in doesn’t work, but the second temp variable the first function worked.

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#include <iostream>
#include <string>
using namespace std;

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

string dayType::weekDays[7] =
{
    "Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"
};

dayType::dayType()
{
    weekDay = " ";
}

dayType::dayType(string d)
{
    weekDay = d;
}

void dayType::setDay(string d)
{
    weekDay = d;
}

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

void dayType::print() const
{
    cout << weekDay << endl;
}

string dayType::nextDay() //const
{
    for(int i = 0; i < 7; i  )
    {
        if(weekDays[i] == weekDay)
        {
            string temp;
            temp = weekDays[i 1];
            weekDay = temp;
        }
    }
    return weekDay;
}

string dayType::prevDay()
{
    for(int i = 0; i < 7; i  )
    {
        if(weekDays[i] == weekDay)
        {
            string temp;
            temp = weekDays[i-1];
            weekDay = temp;
        }
    }
    return weekDay;
}

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

    myDay.print();
    cout << endl;

    cout << myDay.prevDay() << endl;
        cout << "here\n";
    cout << myDay.nextDay() << endl;

    temp.print();
    cout << endl;

    cout << temp.prevDay() << endl;
        cout << "here2";
    cout << temp.nextDay() << endl;

    return 0;
}