I know I am missing something simple plz help

Here is what I have. I am trying to add days to the days I already have. Not sure how to set it up. I want to enter a number and it add to tell what the day will be how would I set that up here is what I have:

Code:

#include <iostream>  

 using namespace std;  

 const char* dayNames[] =  
 {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};  

 class Day  
 {  
     public:  

         Day() { dayNumber = 0; }  
         const char* getDay() { return dayNames[dayNumber]; }  
         const char* getNextDay() { return dayNames[(dayNumber+1) % 7]; }  
         const char* getPrevDay() { return dayNames[(dayNumber+7-1) % 7]; }  
        const char* getDayPlus( int n ) { return dayNames[(dayNumber+n) % 7]; }  
            
         void setDay( int n ) { dayNumber = n; normalize(); }  
         void printDay() { cout << dayNames[dayNumber]; }  

     private:  
         int dayNumber;  
         void normalize() { dayNumber = dayNumber % 7; }  
 };  

 int main()  
 {  
     Day d;  
     cout << "The (default) day is " << d.getDay() <<endl  
          << "The next day is " << d.getNextDay() <<endl 
		  << "How many days do you want to add?" <<endl
          << "The day plus is " << d.getDayPlus() <<endl  
          << "The prev day is " << d.getPrevDay() <<endl;  

     d.setDay(6);  
     cout << "After 'd.setDay(6)' ... the day now is " << d.getDay() <<endl  
          << "The next day is " << d.getNextDay() <<endl  
          << "The day plus is " << d.getDayPlus() <<endl  
          << "The prev day is " << d.getPrevDay() <<endl;  

     d.setDay(3);  
     cout << "After 'd.setDay(3)' ... the day now is " << d.getDay() <<endl  
          << "The next day is " << d.getNextDay() <<endl  
          << "The day plus is " << d.getDayPlus() <<endl  
          << "The prev day is " << d.getPrevDay() <<endl;  

      
     d.printDay();  
     cout << "\nPress 'Enter' to continue ... " << flush;  
     cin.get();

Apart from getDayPlus expecting a parameter (how is this even compiling?), what output do you see, and how exactly is it wrong?

It isn't wrong, but the problem I have is where I inserted the << "How many days do you want to add?" <<endl I want to let the user insert. I know it is something like cin >> but after that I forget. Then to call it when it says The day plus. I can put the intiger in and it will figure and guive me the correct answer but only if you put it in the code I want the user to insert a number.

Yes....
After that statement do
cin>>days;
But must declare the variable days as integer before getting input....

Add a variable to your class " int numOfDays; "

Then use this with the cin call as suggested

Code:

cin >> d.numOfDays;

I would consider a slightly more descriptive name for the object itself by the way..

Originally Posted by iamnewtothis

It isn't wrong...

It is wrong. This code will not compile.
Either you have a very broken compiler or this code is not your real code.

Originally Posted by iamnewtothis

It isn't wrong, but the problem I have is where I inserted the << "How many days do you want to add?" <<endl I want to let the user insert. I know it is something like cin >> but after that I forget. Then to call it when it says The day plus. I can put the intiger in and it will figure and guive me the correct answer but only if you put it in the code I want the user to insert a number.

You declare classes, but you forgot how to get user input?

Ok so I decided to go different. I have it to where it will work except the minus days. I can't get the days to show up.

Code:

#include <iostream>  

 using namespace std;  

 const char* dayNames[] =  
 {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};  

 class Day  
 {  
     public:  

		 Day() { dayNumber = 1; }  
         const char* getDay() { return dayNames[dayNumber]; }  
         const char* getNextDay() { return dayNames[(dayNumber+1) % 7]; }  
         const char* getPrevDay() { return dayNames[(dayNumber+7-1) % 7]; }  
         const char* getDayPlus( int n ) { return dayNames[(dayNumber+n) % 7]; }
         const char* getDayMinus( int n ) { return dayNames[(dayNumber-n) % 7]; }
            
         void setDay( int n ) { dayNumber = n; normalize(); }  
         void printDay() { cout << dayNames[dayNumber]; }  

     private:  
         
		 int dayNumber;  
         void normalize() { dayNumber = dayNumber % 7; }  
 };  

 int main()  
 {  
     Day d;  
     cout << "The (default) day is " << d.getDay() <<endl  
          << "The next day is " << d.getNextDay() <<endl   
          << "The prev day is " << d.getPrevDay() <<endl
		  << "The day + 3 is " << d.getDayPlus(3) <<endl
		  << "The day - 3 is " << d.getDayMinus(3) <<endl;

cout << "\nPress 'Enter' to continue ... " << flush; 

return 0;
 }

Your formula is wrong. If DayNumber = 1, then the formula becomes
(1 - 3) % 7
-2 % 7 = -2
(Undefined behavior!)

The proper logic should be:
if DayNumber - n > 0 then return DayNumber - n;
else if DayNumber - n < 0 then return 7 + DayNumber - n;