Creating text files with %d id in c -

I was wondering how to create a text file like this:

For example If I have:

  file * f; Int id = 1; F = fopen ("file \% d.txt", "a");

At the end of the file, I would like to add the ID number. I tried several things but nothing worked.

Whatever you actually try to do, have failed to show it.

The typical solution is to use sprintf () :

  char fnbuf [1024]; Int a = 1; Sprintf (FNBF, "file% d.txt", A); F = FOPAN (FNBF, "A");

Note that this is very safe, but with a more complexity in a real program it is a good idea to use, and of course to check return values.

Quick