What is file in C++?How dose it define?(what are instructions)How can save data in it?

Right click on your desktop background, choose "New" and then "Text Document". Rename it to Filename.cpp, Filename can be anything. There you have a C++ file! Double click and use notepad, Visual Studio, etc to open and add C++ commands.

What is file in C++?How dose it define?(what are instructions)How can save data in it?
A C++ file usually has the extension of a .cpp. It is merely a text file.





However, the instructions you type into it -- and with the help of a compiler, you can make your computer do something useful.





I suggest that you pick up a book on the subject at your local book store. If it seems to make sense you may find it helpful to purchase or download a free C++ compiler, which will take you CPP file and make it an executable (a program you launch on your computer).





Good luck.