Printf/printing to files

[gobblewobble123]

So, I am trying to learn about how to save, open, close, write to, and append/add to files. I believe that this can be done by using printf, but I'm not sure. I don't think this is the correct syntax but I think printf looks something like this:

1 2 3 4 5

//... { printf(filename.append("Text!")) } //...

(Previously written text...) Text!

So, I'd like to know how to do all of the things listed above (save, open, close, write to, and add/append to files), with the correct syntax, and maybe an example of it being used.

Thanks for your help!

[Zhuge]

If you are using C++, use fstreams.
http://cplusplus.com/reference/iostream/fstream/
http://cplusplus.com/doc/tutorial/files/

If you are using C, use fprintf().
http://cplusplus.com/reference/clibrary/cstdio/fprintf/