Forms and dialogue boxes can be modal or modeless. Modal forms and dialogue boxes prevent switching to other windows, forms or dialogue boxes within the same application and must be closed in order to proceed. They are primarily used to display important messages or to collect vital data from the user. Modeless forms and dialogues, however, do not prevent switching to another window, form or dialogue box. A typical example of a modeless dialogue box is Notepad's Find dialogue box.
Fore that you will need a library that supports the platform(s) you wish to target. Dialog is reasonably generic, but it is written in C rather than C++.
+ is an example, one of many, of a binary operator in C or C++ a = b + c; // for usage example
example output of c++ calculator
comma (,) is an example
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No, BASIC is, for example.
yes
See related links, below.
See related links for an example.
Usually, but not always. For example the following is legal in C, but illegal in C++: char new [3] = "ABC";
struct point { int x; int y; };
On some platforms (unix, for example) devices are handled as special files.