to locate coordinates ..
Use the C++ getline() function from the standard library.
use the _itoa function
I believe, you can use C-function - printf().
Private construction prevents objects from the class from being instantiated other than via a static member function of the class, a friend function or a friend class.
No. I believe TI83+ and TI84 do use an operating system.
No, it really depends on the college. Some colleges don't allow any calculators for their math classes. Everything that can be done on a TI83 can be done with the human brain, so some professors make tests with easier computations so that you don't have to use a TI83
Use function mkdir.
to locate coordinates ..
Yes. (And of course you could simply try it, instead of asking.)
Converts a character to integer (if it is a numeric character)
Use the C++ getline() function from the standard library.
You need a formula. That formula can use the Sum function or it could use the plus sign, or several plus signs and even several Sum functions. Primarily it is the Sum function and the plus sign that is used for sums.
use the _itoa function
It's in conio.h, but don't use gotoxy. Use SetCursorPosition() instead.
You have to make sure that your program runs smoothly. Make sure that the program does not get tangled up in too many Lbls and Gotos. Running several programs at once does not mean executing them all at once, but it simply running several segments at once. For those who know how to program a TI-83 or TI-84, you can try incorporating this program into yours. It is basically a number counter that will act like a timer while you execute another program. I put the coordinates as 0 and 89 so that the timer will end up in the corner of the screen, rather than someplace in the middle. ClrDraw 0->A Lbl 1 Text(0,89,A) A+1->A Goto 2 Lbl 2 (Here, you can put all your other game stuff in this space. If you are using any key presses, create a segment something like this) Getkey->G If G=22:Then (Here, you can stop the program entirely with these function) ClrDraw Stop (Or you can make it go to another segment of coding. If that's the case, then use this command) Goto 3 (from there, do whatever else you like) (Otherwise, if you want to return to the timer, then do this) Else Goto 1 (Or if you have other keys you want to press, then do this) Else Goto 4 Lbl 4 If Getkey=25:Then (and so on. Don't forget to add the 'Else' command later in your program.) Getkey can be mapped out on your calculator buttons. 11 is the first number, which is the 'Y=' button. The related link below, getKey Codes, will tell you more about Getkey.
You can use rand(). Make sure that you use srand()to generate the seed for rand() (if you do not, you get so called pseudo random numbers).