What do you mean at closing? When you close your program? If so, just make it one of your last lines.

Use the remove function ..ok BOB.. but how do i use it ,, syntax etc...
please bob, it's an emergancy.

In header <cstdio>:
int remove(const char* filename)

Probably too late for you by now, as you needed an answer urgently. I hope you had the sense to look up remove() in your C++ book, or do a Google search.

you can register a function that will be called when the program terminates with the atexit() function. this func could tehn call remove() on the file.